13,489 results match your criteria Nano Letters [Journal]


Coexistence of Elastic Modulations in the Charge Density Wave State of 2H-NbSe2.

Nano Lett 2019 Apr 18. Epub 2019 Apr 18.

Bulk and single-layer NbSe2 exhibit identical charge density wave order (CDW) with a quasi-commensurate 3x3 superlattice periodicity. Here we combine scanning tunnelling microscopy (STM) imaging at T = 1 K of 2H-NbSe2 with first-principles density functional theory (DFT) calculations to investigate the structural atomic rearrangement of this CDW phase. Our calculations reveal that six different atomic structures are compatible with the 3×3 CDW distortion, although all of them lie on a very narrow energy range of at most 3 meV per formula unit, suggesting the coexistence of such structures. Read More

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http://pubs.acs.org/doi/10.1021/acs.nanolett.9b00268
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http://dx.doi.org/10.1021/acs.nanolett.9b00268DOI Listing
April 2019
1 Read

Flagella-like beating of a single microtubule.

Nano Lett 2019 Apr 18. Epub 2019 Apr 18.

Kinesin motors can induce a buckling instability in a microtubule with a fixed minus end. Here we show that by modifying the surface with a protein-repellent functionalization and using clusters of kinesin motors, the microtubule can exhibit persistent oscillatory motion resembling the beating of sperm flagella. The observed period is of the order of 1 min. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b01091DOI Listing

Layer-stacking, defects and robust superconductivity on Mo-terminated surface of ultrathin Mo2C flakes grown by CVD.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Materials can exhibit exotic properties when they approach the two dimensional (2D) limit. Because of promising applications in catalysis and energy storage, 2D transition metal carbides (TMCs) have attracted considerable attention in recent years. Among these TMCs, ultrathin crystalline α-Mo2C flakes have been fabricated by chemical vapor deposition on Cu/Mo bilayer foils and their 2D superconducting property was revealed by transport measurement. Read More

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http://pubs.acs.org/doi/10.1021/acs.nanolett.9b00972
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http://dx.doi.org/10.1021/acs.nanolett.9b00972DOI Listing
April 2019
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Coexistence of Different Charge Transfer Mechanisms in the Hot Carrier Dynamics of Hybrid Plasmonic Nanomaterials.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Hot-carrier dynamics at interfaces of semiconductors and nanoclusters is of significant importance for photovoltaic and photocatalytic applications. Plasmon-driven charge separation processes are considered to be only dependent on the type of donor-acceptor interactions, i.e. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00647DOI Listing

Angstrom Scale Chemical Analysis of Metal Supported Trans- and Cis-Regioisomers by Ultrahigh Vacuum Tip-Enhanced Raman Mapping.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Real space chemical analysis of two structurally very similar components i.e. regioisomers lies at the heart of heterogeneous catalysis reactions, modern-age electronic devices and various other surface related problems in surface science and nanotechnology. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00826DOI Listing

Aqueous Zinc-Ion Storage in MoS by Tuning the Intercalation Energy.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States.

Aqueous Zn-ion batteries present low-cost, safe, and high-energy battery technology but suffer from the lack of suitable cathode materials because of the sluggish intercalation kinetics associated with the large size of hydrated zinc ions. Herein we report an effective and general strategy to transform inactive intercalation hosts into efficient Zn storage materials through intercalation energy tuning. Using MoS as a model system, we show both experimentally and theoretically that even hosts with an originally poor Zn diffusivity can allow fast Zn diffusion. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00697DOI Listing
April 2019
3 Reads

Stable Efficiency Exceeding 20.6% for Inverted Perovskite Solar Cells through Polymer-Optimized PCBM Electron-Transport Layers.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Materials Science and Engineering , Pennsylvania State University , University Park, Pennsylvania 16802 , United States.

Fullerene derivative, such as [6,6]-phenyl C61 butyric acid methyl ester (PCBM), is widely used as an electron-transport layer (ETL) in inverted perovskite solar cell (PSC). However, its low electron mobility, complexity in achieving quality film formation, and severe nonradiative recombination at perovskite/PCBM interface due to the large electron capture region, lead to lower efficiency for inverted PSCs compared to the normal structures. Herein, we demonstrate an effective and practical strategy to overcome these challenges. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00936DOI Listing

Nanostructures, faceting, and splitting in nano- to yocto-liter liquid droplets.

Nano Lett 2019 Apr 15. Epub 2019 Apr 15.

Contrary to everyday experience, where all liquid droplets assume rounded, near-spherical shapes, the temperature-tuning of liquid droplets to faceted polyhedral shapes, and to spontaneous splitting, has been recently demonstrated in oil-in-water emulsions. However, the elucidation of the mechanism driving these surprising effects, as well as their many potential applications, ranging from faceted nanoparticle synthesis, through new industrial emulsification routes, to controlled-release drug delivery within the human body, have been severely hampered by the micron-scale resolution of the light microscopy employed to date in all in situ studies. Thus, the thickness of the interfacially-frozen crystalline monolayer, suggested to drive these effects, could not be directly measured, and the low limit on the droplet size still showing these effects remained unknown. Read More

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http://pubs.acs.org/doi/10.1021/acs.nanolett.9b00594
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http://dx.doi.org/10.1021/acs.nanolett.9b00594DOI Listing
April 2019
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Accidental contamination of substrates and polymer films by organic quantum emitters.

Nano Lett 2019 Apr 15. Epub 2019 Apr 15.

We report the observation of ubiquitous contamination of dielectric subtracts and polymethylmethacrylate matrices by organic molecules with optical activity in the visible spectral range. Contamination sites of individual solvent-related fluorophores in thin films of polymethylmethacrylate constitute fluorescence hotspots with quantum emission statistics and quantum yields approaching 30% at cryogenic temperatures. Our findings not only resolve prevalent puzzles in the assignment of spectral features to various nanoemitters on bare dielectric substrates or in polymer matrices, they also identify means for simple and cost-efficient realization of single-photon sources in the visible spectral range. Read More

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http://pubs.acs.org/doi/10.1021/acs.nanolett.9b00712
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http://dx.doi.org/10.1021/acs.nanolett.9b00712DOI Listing
April 2019
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Graphene Oxide Flakes Tune Excitatory Neurotransmission in Vivo by Targeting Hippocampal Synapses.

Nano Lett 2019 Apr 18. Epub 2019 Apr 18.

Neuron Physiology and Technology Lab , International School for Advanced Studies (SISSA), Neuroscience , 34136 Trieste Italy.

Synapses compute and transmit information to connect neural circuits and are at the basis of brain operations. Alterations in their function contribute to a vast range of neuropsychiatric and neurodegenerative disorders and synapse-based therapeutic intervention, such as selective inhibition of synaptic transmission, may significantly help against serious pathologies. Graphene is a two-dimensional nanomaterial largely exploited in multiple domains of science and technology, including biomedical applications. Read More

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http://dx.doi.org/10.1021/acs.nanolett.8b04903DOI Listing

Three-Dimensional, High-Resolution Printing of Carbon Nanotube/Liquid Metal Composites with Mechanical and Electrical Reinforcement.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Nano Science Technology Institute, Department of Materials Science and Engineering , Yonsei University , Seoul 03722 , Republic of Korea.

The formation of three-dimensional (3D) interconnections is essential in integrated circuit packaging technology. However, conventional interconnection methods, including the wire-bonding process, were developed for rigid structures of electronic devices, and they are not applicable to the integration of soft and stretchable electronic devices. Hence, there is a strong demand for 3D interconnection technology that is applicable to soft, stretchable electronic devices. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00150DOI Listing

High Affinity to Skeleton Rare Earth Doped Nanoparticles for Near-Infrared II Imaging.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Molecular Imaging Program at Stanford (MIPS), Bio-X Program, and Department of Radiology, Canary Center at Stanford for Cancer Early Detection , Stanford University , Stanford , California 94305-5344 , United States.

As a newly noninvasive emerging modality, NIR-II fluorescence imaging (1000-1700 nm) has many advantages over conventional visible and NIR-I imaging (700-900 nm). Unfortunately, only a few NIR-II fluorophores are suitable for bone imaging. Here, we report an NIR-II fluorophore based on DSPE-mPEG encapsulated rare earth doped nanoparticles (RENPs@DSPE-mPEG), which shows inherent affinity to bone without linking any targeting ligands, and thus, it provides an alternative noninvasive and nonradiation strategy for skeletal system mapping and bone disease diagnoses. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00140DOI Listing
April 2019
2 Reads

CuS Nanoparticles as a Photodynamic Nanoswitch for Abrogating Bypass Signaling to Overcome Gefitinib Resistance.

Nano Lett 2019 Apr 12. Epub 2019 Apr 12.

Bypass signaling activation plays a crucial role in the acquired resistance of gefitinib, the first targeted drug in the clinic to treat advanced non-small cell lung cancer. Although the inactivation of bypass signaling by small-molecule inhibitors or monoclonal antibodies may overcome gefitinib resistance, their clinical use has been limited by the complex production process and off-target toxicity. Here we show CuS nanoparticles (NPs) behaved as a photodynamic nanoswitch to specifically abrogate overactive bypass signaling in resistant tumor cells, without interfering the same signal pathways in normal cells. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b01065DOI Listing
April 2019
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Asymmetric Multimetallic Mesoporous Nanospheres.

Nano Lett 2019 Apr 16. Epub 2019 Apr 16.

Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science , Nanjing Normal University , Nanjing 210023 , China.

Mesoporous colloidal nanospheres with tailorable asymmetric nanostructures and multimetallic elemental compositions are building blocks in next-generation heterogeneous catalysts. Introducing structural asymmetry into metallic mesoporous frameworks has never been demonstrated, but it would be beneficial because the asymmetry enables the spatial control of catalytic interfaces, facilitates the electron/mass transfer and assists in the removal of poisonous intermediates. Herein, we describe a simple bottom-up strategy to generate uniform sub-100 nm multimetallic asymmetric bowl-shaped mesoporous nanospheres (BMSs). Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b01223DOI Listing

Unprecedented New Crystalline Forms of SnSe in Narrow to Medium Diameter Carbon Nanotubes.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Department of Physics , University of Warwick , Coventry CV4 7AL , United Kingdom.

We report the observation of four unprecedented new crystalline forms of SnSe, obtained as a result of encapsulation in narrow to medium diameter single-walled carbon nanotubes. Aberration-corrected scanning transmission electron microscopy at 80 kV revealed linear, zigzag, helical (i.e. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00133DOI Listing

Exciton-Plasmon Energy Exchange Drives the Transition to a Strong Coupling Regime.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Department of Physics , Jackson State University , Jackson , Mississippi 39217 , United States.

We present a model for exciton-plasmon coupling based on an energy exchange mechanism between quantum emitters (QE) and localized surface plasmons in metal-dielectric structures. Plasmonic correlations between QEs give rise to a collective state exchanging its energy cooperatively with a resonant plasmon mode. By defining carefully the plasmon mode volume for a QE ensemble, we obtain a relation between QE-plasmon coupling and a cooperative energy transfer rate that is expressed in terms of local fields. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00827DOI Listing

Spontaneous Formation of 1D Pattern in Monolayer VSe with Dispersive Adsorption of Pt Atoms for HER Catalysis.

Nano Lett 2019 Apr 15. Epub 2019 Apr 15.

Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China.

Creation of functional patterns in two-dimensional (2D) materials provides opportunities to extend their potential for applications. Transition-metal dichalcogenides (TMDCs) are suitable 2D materials for pattern generation because of properties including alterable polymorphic phases, easy chalcogen-vacancy formation, metal-atom insertion, and alloying. Such patterning can be used for selective functionalization. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00889DOI Listing

Direct Synthesis of Water-Dispersible Magnetic/Plasmonic Heteronanostructures for Multimodality Biomedical Imaging.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Department of Chemistry , University of California , Riverside , California 92521 , United States.

Magnetic/plasmonic hybrid nanoparticles are highly desirable for multimodal bioimaging and biosensing. Although the synthesis of heterodimeric nanoparticles has been reported, the products are usually hydrophobic so that post-treatment procedures are required to transfer them into water which are often difficult to perform and cause damages to the structures. Direct synthesis of hydrophilic hybrid nanostructures has remained a grand challenge albeit its immediate advantage of biocompatibility. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00171DOI Listing
April 2019
13.592 Impact Factor

Nanovoid Membranes Embedded with Hollow Zwitterionic Nanocapsules for a Superior Desalination Performance.

Nano Lett 2019 Apr 18. Epub 2019 Apr 18.

Center for Membrane Separation and Water Science & Technology, Ocean College , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China.

In order to lower the capital and operational cost of desalination and wastewater treatment processes, nanofiltration (NF) membranes need to have a high water permeation and ionic rejection, while also maintaining a stable performance through antifouling resistance. Recently, Turing-type reaction conditions [ Science 2018, 360, 518-521] and sacrificed metal organic frame (MOF) nanoparticles [ Nat. Commun. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00060DOI Listing
April 2019
13.592 Impact Factor

Reversal of Osteoporotic Activity by Endothelial Cell-Secreted Bone-Targeting and Biocompatible Exosomes.

Nano Lett 2019 Apr 10. Epub 2019 Apr 10.

Exosomes, also known as extracellular vesicles (EVs), are naturally occurring, biocompatible, and bioacive nanoparticles ranging from 40 to 150 nm in diameter. Bone-secreted exosomes play important roles in bone homeostasis, the interruption of which can lead to diseases such as oste-oporosis, rheumatoid arthritis, and osteopetrosis. Though the relationship between vascular and bone homeostasis has been recognized recently, the role of vascular endothelial cell (EC)-secreted exosomes (EC-Exos) in bone homeostasis is not well understood. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00287DOI Listing
April 2019
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Pursuing Specific Chemotherapy of Orthotopic Breast Cancer with Lung Metastasis from Docking Nanoparticles Driven by Bioinspired Exosomes.

Nano Lett 2019 Apr 15. Epub 2019 Apr 15.

School of Biomedical Engineering, State Key Laboratory of Oncology in South China , Sun Yat-sen University , Guangzhou , Guangdong 510006 , China.

Breast cancer develops from local tissue but is characterized by a distinct metastatic pattern involving regional lymph nodes and distant organs, which is the primary cause of high mortality in breast cancer patients. Herein, optimal docking nanoparticles (NPs) composed of a laurate-functionalized Pt(IV) prodrug (Pt(lau)), human serum albumin (HSA), and lecithin were predicted by computational modeling, prepared by nanoprecipitation, and validated by fluorescence spectroscopy. As macrophages have been reported to be preferentially recruited by breast cancer, Rex, the exosome spontaneously secreted by murine RAW 264. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00824DOI Listing
April 2019
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Genetically Engineered Cell Membrane Nanovesicles for Oncolytic Adenovirus Delivery: A Versatile Platform for Cancer Virotherapy.

Nano Lett 2019 Apr 12. Epub 2019 Apr 12.

State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics and Center for Molecular Imaging and Translational Medicine, School of Public Health , Xiamen University , Xiamen 361102 , China.

Currently, various oncolytic adenoviruses (OA) are being explored in both preclinical and clinical virotherapy. However, the pre-existing neutralizing antibodies (nAbs) and poor targeting delivery are major obstacles for systemically administered OA. Therefore, we designed bioengineered cell membrane nanovesicles (BCMNs) that harbor targeting ligands to achieve robust antiviral immune shielding and targeting capabilities for oncolytic virotherapy. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00145DOI Listing

Manganese as a Catalytic Mediator for Photo-oxidation and Breaking the pH Limitation of Nanozymes.

Nano Lett 2019 Apr 12. Epub 2019 Apr 12.

Department of Chemistry , Waterloo Institute for Nanotechnology , Waterloo , Ontario , Canada N2L 3G1.

A long-standing challenge in nanozyme catalysis is low activity at physiological pH, especially for oxidase- and peroxidase-mimicking nanozymes. We herein communicate that Mn(II) can promote catalysis at neutral pH for carbon dots (C-dots) as a photo-oxidase nanozyme. The C-dots produce singlet oxygen upon light irradiation to oxidize Mn(II) to Mn(III), which is confirmed by a suite of spectroscopic evidence. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00725DOI Listing

Atomic-Scale Control of Magnetism at the Titanite-Manganite Interfaces.

Nano Lett 2019 Apr 11. Epub 2019 Apr 11.

Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore.

Complex oxide thin-film heterostructures often exhibit magnetic properties different from those known for bulk constituents. This is due to the altered local structural and electronic environment at the interfaces, which affects the exchange coupling and magnetic ordering. The emergent magnetism at oxide interfaces can be controlled by ferroelectric polarization and has a strong effect on spin-dependent transport properties of oxide heterostructures, including magnetic and ferroelectric tunnel junctions. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00441DOI Listing
April 2019
6 Reads

Electrically Addressing the Spin of a Magnetic Porphyrin through Covalently Connected Graphene Electrodes.

Nano Lett 2019 Apr 11. Epub 2019 Apr 11.

CIC nanoGUNE , Tolosa Hiribidea 76 , 20018 Donostia-San Sebastian , Spain.

We report on the fabrication and transport characterization of atomically precise single-molecule devices consisting of a magnetic porphyrin covalently wired by graphene nanoribbon electrodes. The tip of a scanning tunneling microscope was utilized to contact the end of a GNR-porphyrin-GNR hybrid system and create a molecular bridge between the tip and sample for transport measurements. Electrons tunneling through the suspended molecular heterostructure excited the spin multiplet of the magnetic porphyrin. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00883DOI Listing

Lattice -Mismatch-Induced Ultrastable 1T-Phase MoS-Pd/Au for Plasmon-Enhanced Hydrogen Evolution.

Nano Lett 2019 Apr 8. Epub 2019 Apr 8.

Key Laboratory of Automobile Materials of MOE, School of Materials Science and Engineering , Jilin University , 2699 Qianjin Street , Changchun 130012 , People's Republic of China.

Metallic 1T-phase transition metal dichalcogenides (TMDs) are of considerable interest in enhancing catalytic applications due to their abundant active sites and good conductivity. However, the unstable nature of 1T-phase TMDs greatly impedes their practical applications. Herein, we developed a new approach for the synthesis of highly stable 1T-phase Au/Pd-MoS nanosheets (NSs) through a metal assembly induced ultrastable phase transition for achieving a very high electrocatalytic activity in the hydrogen evolution reaction. Read More

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http://dx.doi.org/10.1021/acs.nanolett.8b04104DOI Listing
April 2019
2 Reads
13.592 Impact Factor

Electrostatic Assemblies of Single-Walled Carbon Nanotubes and Sequence-Tunable Peptoid Polymers Detect a Lectin Protein and Its Target Sugars.

Nano Lett 2019 Apr 19. Epub 2019 Apr 19.

Department of Chemical and Biomolecular Engineering , University of California, Berkeley , Berkeley , California 94720 , United States.

A primary limitation to real-time imaging of metabolites and proteins has been the selective detection of biomolecules that have no naturally occurring or stable molecular recognition counterparts. We present developments in the design of synthetic near-infrared fluorescent nanosensors based on the fluorescence modulation of single-walled carbon nanotubes (SWNTs) with select sequences of surface-adsorbed N-substituted glycine peptoid polymers. We assess the stability of the peptoid-SWNT nanosensor candidates under variable ionic strengths, protease exposure, and cell culture media conditions and find that the stability of peptoid-SWNTs depends on the composition and length of the peptoid polymer. Read More

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http://dx.doi.org/10.1021/acs.nanolett.8b04955DOI Listing

Holey Graphene Metal Nanoparticle Composites via Crystalline Polymer Templated Etching.

Nano Lett 2019 Apr 15. Epub 2019 Apr 15.

Department of Chemistry , University of Pittsburgh , Pittsburgh , Pennsylvania 15260 , United States.

While graphene has sparked enormous research interest since its isolation in 2004, there has also been an interest in developing graphene composite materials that leverage graphene's extraordinary physical properties toward new technologies. Oxidative analogues such as graphene oxide and reduced graphene oxide retain many of the same properties of graphene. While these materials contain many functional moieties, defect formation through current oxidation methods is random which, despite reductive treatments, can never fully recover the properties of the starting material. Read More

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http://dx.doi.org/10.1021/acs.nanolett.8b04755DOI Listing
April 2019
1 Read

Peptide-Drug Conjugate-Based Nanocombination Actualizes Breast Cancer Treatment by Maytansinoid and Photothermia with the Assistance of Fluorescent and Photoacoustic Images.

Nano Lett 2019 Apr 11. Epub 2019 Apr 11.

Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China.

To develop a highly efficient strategy against tumors, here, a nanocombination (PDC/P@HCuS) was designed and constructed to actualize chemo-phototherapy with the assistance of fluorescence (FL) and photoacoustic (PA) images. First, a type of organic-inorganic hybrid nanosystem (P@HCuS) was engineered by coupling the fluorescence-labeled amphiphilic fPEDC copolymer on the surface of hollow mesoporous copper sulfide nanoparticle (HCuS), in which HCuS was used as a photothermal and PA agent; fPEDC as a stabilizer, chromophore, and redox/pH-sensitive gatekeeper; and both of them as drug carriers. Then, a peptide-drug conjugate (cRGD-SMCC-DM1, PDC), as a molecular targeted maytansinoid, was loaded inside of P@HCuS to form PDC/P@HCuS. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00770DOI Listing

High-Safety All-Solid-State Lithium-Metal Battery with High-Ionic-Conductivity Thermoresponsive Solid Polymer Electrolyte.

Nano Lett 2019 Apr 10. Epub 2019 Apr 10.

Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province , Soochow University , Suzhou 215006 , China.

Lithium-metal batteries (LMB) are very attractive owing to their high theoretical energy density, but significant challenges such as low ionic conductivity and safety risks prevent their widespread application. Herein, we report a new design of high-safety all-solid-state LMB by using high-ionic-conductivity thermoresponsive solid-polymer electrolyte (TSPE), providing a smart and active approach to realize thermally induced autonomic shutdown of LMBs by efficiently inhibiting the ionic conduction between electrodes beyond an unsafe temperature. The as-obtained TSPE exhibits a high ionic conductivity (2 × 10 S cm at 30 °C), which enables a significantly improved capacity of 160 mA h g at 0. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00450DOI Listing
April 2019
4 Reads

Real-Time TEM Study of Nanopore Evolution in Battery Materials and Their Suppression for Enhanced Cycling Performance.

Nano Lett 2019 Apr 5. Epub 2019 Apr 5.

Battery materials, which store energy through combining mechanisms of intercalation, conversion and alloying, provide promisingly high energy density but usually suffer from fast capacity decay due to the drastic volume change upon cycling. Particularly, the significant volume shrinkage upon mass (Li+, Na+, etc) extraction inevitably leads to the formation of pores in materials and their final pulverization after cycling. It is necessary to explore the failure mechanism of such battery materials from the microscopic level in order to understand the evolution of porous structures. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00491DOI Listing

Adhesion Stabilized en Masse Intracellular Electrical Recordings from Multicellular Assemblies.

Nano Lett 2019 Apr 12. Epub 2019 Apr 12.

Department for Cellular Biophysics , Max Planck Institute for Medical Research , Jahnstraße 29 , 69120 Heidelberg , Germany.

Coordinated collective electrochemical signals in multicellular assemblies, such as ion fluxes, membrane potentials, electrical gradients, and steady electric fields, play an important role in cell and tissue spatial organization during many physiological processes like wound healing, inflammatory responses, and hormone release. This mass of electric actions cumulates in an en masse activity within cell collectives which cannot be deduced from considerations at the individual cell level. However, continuously sampling en masse collective electrochemical actions of the global electrochemical activity of large-scale electrically coupled cellular assemblies with intracellular resolution over long time periods has been impeded by a lack of appropriate recording techniques. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00784DOI Listing
April 2019
4 Reads

Tip-Enhanced Infrared Difference-Nanospectroscopy of the Proton Pump Activity of Bacteriorhodopsin in Single Purple Membrane Patches.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Istituto Italiano di Tecnologia, Center for Life NanoScience , Viale Regina Elena 291 , I-00161 Roma , Italy.

Photosensitive proteins embedded in the cell membrane (about 5 nm thickness) act as photoactivated proton pumps, ion gates, enzymes, or more generally, as initiators of stimuli for the cell activity. They are composed of a protein backbone and a covalently bound cofactor (e.g. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00512DOI Listing

Tunable Hyperbolic Metamaterials Based on Self-Assembled Carbon Nanotubes.

Nano Lett 2019 Apr 10. Epub 2019 Apr 10.

Department of Electrical Engineering , Stanford University , Stanford , California 94305 , United States.

We show that packed, horizontally aligned films of single-walled carbon nanotubes are hyperbolic metamaterials with ultrasubwavelength unit cells and dynamic tunability. Using Mueller matrix ellipsometry, we characterize the films' optical properties, which are doping level dependent, and find a broadband hyperbolic region tunable in the mid-infrared. To characterize the dispersion of in-plane hyperbolic plasmon modes, we etch the nanotube films into nanoribbons with differing widths and orientations relative to the nanotube axis, and we observe that the hyperbolic modes support strong light localization. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00552DOI Listing
April 2019
4 Reads

Reprogramming Tumor Immune Microenvironment (TIME) and Metabolism via Biomimetic Targeting Codelivery of Shikonin/JQ1.

Nano Lett 2019 Apr 5. Epub 2019 Apr 5.

State Key Laboratory of Drug Research , Shanghai Institute of Materia Medica, Chinese Academy of Sciences , 501 Haike Road , Shanghai 201203 , China.

Remodeling tumor immune microenvironment (TIME) is an important strategy to lift the immunosuppression and achieve immune normalization. In this work, a mannosylated lactoferrin nanoparticulate system (Man-LF NPs) is developed for dual-targeting biomimetic codelivery of shikonin and JQ1 via the mannose receptor and LRP-1 that are overexpressed in both cancer cells and tumor-associated macrophages. The Man-LF NPs can serve as multitarget therapy for inducing immune cell death in the cancer cells, repressing glucose metabolism and repolarizing tumor-associated macrophages, and consequently, lead to remodeling the TIME (e. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00021DOI Listing

Anomalously Low Barrier for Water Dimer Diffusion on Cu(111).

Nano Lett 2019 Apr 9. Epub 2019 Apr 9.

Physical Chemistry I, Department of Chemistry and Biochemistry , Ruhr-Universität Bochum , D-44780 Bochum , Germany.

A molecular-scale description of water and ice is important in fields as diverse as atmospheric chemistry, astrophysics, and biology. Despite a detailed understanding of water and ice structures on a multitude of surfaces, relatively little is known about the kinetics of water motion on surfaces. Here, we report a detailed study on the diffusion of water monomers and the formation and diffusion of water dimers through a combination of time-lapse low-temperature scanning tunnelling microscopy experiments and first-principles electronic structure calculations on the atomically flat Cu(111) surface. Read More

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http://pubs.acs.org/doi/10.1021/acs.nanolett.9b00392
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http://dx.doi.org/10.1021/acs.nanolett.9b00392DOI Listing
April 2019
2 Reads

Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface.

Nano Lett 2019 Apr 17. Epub 2019 Apr 17.

Electronic and Electrical Engineering , University College London , London , WC1E 7JE United Kingdom.

Terahertz (THz) photoconductive devices are used for generation, detection, and modulation of THz waves, and they rely on the ability to switch electrical conductivity on a subpicosecond time scale using optical pulses. However, fast and efficient conductivity switching with high contrast has been a challenge, because the majority of photoexcited charge carriers in the switch do not contribute to the photocurrent due to fast recombination. Here, we improve efficiency of electrical conductivity switching using a network of electrically connected nanoscale GaAs resonators, which form a perfectly absorbing photoconductive metasurface. Read More

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http://dx.doi.org/10.1021/acs.nanolett.8b05118DOI Listing
April 2019
2 Reads

Direct Photoluminescence Probing of Ferromagnetism in Monolayer Two-Dimensional CrBr.

Nano Lett 2019 Apr 12. Epub 2019 Apr 12.

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371 , Singapore.

Atomically thin magnets are the key element to build up spintronics based on two-dimensional materials. The surface nature of two-dimensional ferromagnet opens up opportunities to improve the device performance efficiently. Here, we report the intrinsic ferromagnetism in atomically thin monolayer CrBr, directly probed by polarization resolved magneto-photoluminescence. Read More

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http://pubs.acs.org/doi/10.1021/acs.nanolett.9b00553
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http://dx.doi.org/10.1021/acs.nanolett.9b00553DOI Listing
April 2019
3 Reads

Quantum-Dot-Like States in Molybdenum Disulfide Nanostructures Due to the Interplay of Local Surface Wrinkling, Strain, and Dielectric Confinement.

Nano Lett 2019 Apr 10. Epub 2019 Apr 10.

The observation of quantum light emission from atomically thin transition metal dichalcogenides has opened a new field of applications for these material systems. The corresponding excited charge-carrier localization has been linked to defects and strain, while open questions remain regarding the microscopic origin. We demonstrate that the bending rigidity of these materials leads to wrinkling of the two-dimensional layer. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00641DOI Listing

Nanodomain Engineering for Programmable Ferroelectric Devices.

Nano Lett 2019 Apr 5. Epub 2019 Apr 5.

Department of Physics and Astronomy , University of Nebraska , Lincoln , Nebraska 68588 , United States.

We introduce a concept of programmable ferroelectric devices composed of two-dimensional (2D) and ferroelectric (FE) materials. It enables precise modulation of the in-plane conductivity of a 2D channel material through nanoengineering FE domains with out-of-plane polarization. The functionality of these new devices has been demonstrated using field-effect transistors (FETs) fabricated with monolayer molybdenum disulfide (MoS) channels on the Pb(Zr,Ti)O substrates. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00673DOI Listing
April 2019
3 Reads

Nanoenabled Modulation of Acidic Tumor Microenvironment Reverses Anergy of Infiltrating T Cells and Potentiates Anti-PD-1 Therapy.

Nano Lett 2019 Apr 5. Epub 2019 Apr 5.

Institutes for Life Sciences, School of Medicine and National Engineering Research Center for Tissue Restoration and Reconstruction , South China University of Technology , Guangzhou 510006 , China.

While tumor-infiltrating cytotoxic T lymphocytes play a critical role in controlling tumor development, they are generally impotent in an acidic tumor microenvironment. Systemic treatment to neutralize tumor acidity thus holds promise for the reversal of the anergic state of T cells and the improvement of T cell-associated immunotherapy. Herein, we report a proof-of-concept of RNAi nanoparticle-mediated therapeutic reversion of tumor acidity to restore the antitumor functions of T cells and potentiate the checkpoint blockade therapy. Read More

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http://dx.doi.org/10.1021/acs.nanolett.8b04296DOI Listing
April 2019
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Observation of Interfacial Antiferromagnetic Coupling between Magnetic Topological Insulator and Antiferromagnetic Insulator.

Nano Lett 2019 Apr 8. Epub 2019 Apr 8.

Department of Physics , Pennsylvania State University , University Park , Pennsylvania 16802 , United States.

Inducing magnetic orders in a topological insulator (TI) to break its time reversal symmetry has been predicted to reveal many exotic topological quantum phenomena. The manipulation of magnetic orders in a TI layer can play a key role in harnessing these quantum phenomena toward technological applications. Here we fabricated a thin magnetic TI film on an antiferromagnetic (AFM) insulator CrO layer and found that the magnetic moments of the magnetic TI layer and the surface spins of the CrO layers favor interfacial AFM coupling. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00027DOI Listing
April 2019
4 Reads
13.592 Impact Factor

Optomechanical Measurement of Thermal Transport in Two-Dimensional MoSe Lattices.

Nano Lett 2019 Apr 4. Epub 2019 Apr 4.

ICFO - Institut de Ciencies Fotoniques , The Barcelona Institute of Science and Technology , 08860 Castelldefels , Barcelona , Spain.

Nanomechanical resonators have emerged as sensors with exceptional sensitivities. These sensing capabilities open new possibilities in the studies of the thermodynamic properties in condensed matter. Here, we use mechanical sensing as a novel approach to measure the thermal properties of low-dimensional materials. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00560DOI Listing
April 2019
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InGaN Platelets: Synthesis and Applications toward Green and Red Light-Emitting Diodes.

Nano Lett 2019 Apr 12. Epub 2019 Apr 12.

RISE Research Institutes of Sweden AB , 22370 Lund , Sweden.

In this work, we present a method to synthesize arrays of hexagonal InGaN submicrometer platelets with a top c-plane area having an extension of a few hundred nanometers by selective area metal-organic vapor-phase epitaxy. The InGaN platelets were made by in situ annealing of InGaN pyramids, whereby InGaN from the pyramid apex was thermally etched away, leaving a c-plane surface, while the inclined {101̅1} planes of the pyramids were intact. The as-formed c-planes, which are rough with islands of a few tens of nanometers, can be flattened with InGaN regrowth, showing single bilayer steps and high-quality optical properties (full width at half-maximum of photoluminescence at room temperature: 107 meV for InGaN and 151 meV for InGaN). Read More

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http://dx.doi.org/10.1021/acs.nanolett.8b04781DOI Listing
April 2019
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Spectroscopic Evidence for the Contribution of Holes to the Bleach of Cd-Chalcogenide Quantum Dots.

Nano Lett 2019 Apr 8. Epub 2019 Apr 8.

Optoelectronic Materials Section, Faculty of Applied Sciences , Delft University of Technology , Van der Maasweg 9 , HAZ Delft 2629 , The Netherlands.

In transient absorption (TA) measurements on Cd-chalcogenide quantum dots (QDs), the presence of a band-edge (BE) bleach signal is commonly attributed entirely to conduction-band electrons in the 1S(e) state, neglecting contributions from BE holes. While this has been the accepted view for more than 20 years, and has often been used to distinguish electron and hole kinetics, the reason for the absence of a hole contribution to the BE-bleach has remained unclear. Here, we show with three independent experiments that holes do in fact have a significant impact on the BE-bleach of well-passivated Cd-chalcogenide QD samples. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00164DOI Listing
April 2019
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Ultrafast Electron Dynamics in Single Aluminum Nanostructures.

Nano Lett 2019 Apr 8. Epub 2019 Apr 8.

Department of Materials Science and Engineering , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States.

Aluminum nanostructures are a promising alternative material to noble metal nanostructures for several photonic and catalytic applications, but their ultrafast electron dynamics remain elusive. Here, we combine single-particle transient extinction spectroscopy and parameter-free first-principles calculations to investigate the non-equilibrium carrier dynamics in aluminum nanostructures. Unlike gold nanostructures, we find the sub-picosecond optical response of lithographically fabricated aluminum nanodisks to be more sensitive to the lattice temperature than the electron temperature. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00503DOI Listing
April 2019
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Observation of Nanoscale Skyrmions in SrIrO/SrRuO Bilayers.

Nano Lett 2019 Apr 3. Epub 2019 Apr 3.

Department of Physics , The Ohio State University , Columbus , Ohio 43210 , United States.

Skyrmion imaging and electrical detection via topological Hall (TH) effect are two primary techniques for probing magnetic skyrmions, which hold promise for next-generation magnetic storage. However, these two kinds of complementary techniques have rarely been employed to investigate the same samples. We report the observation of nanoscale skyrmions in SrIrO/SrRuO (SIO/SRO) bilayers in a wide temperature range from 10 to 100 K. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00596DOI Listing