Publications by authors named "Teri W Odom"

210 Publications

Spontaneous Formation of Ordered Magnetic Domains by Patterning Stress.

Nano Lett 2021 Apr 13. Epub 2021 Apr 13.

Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou, 310018, PR China.

The formation of ordered magnetic domains in thin films is important for the magnetic microdevices in spin-electronics, magneto-optics, and magnetic microelectromechanical systems. Although inducing anisotropic stress in magnetostrictive materials can achieve the domain assembly, controlling magnetic anisotropy over microscale areas is challenging. In this work, we realized the microscopic patterning of magnetic domains by engineering stress distribution. Deposition of ferromagnetic thin films on nanotrenched polymeric layers induced tensile stress at the interfaces, giving rise to the directional magnetoelastic coupling to form ordered domains spontaneously. By changing the periodicity and shape of nanotrenches, we spatially tuned the geometric configuration of domains by design. Theoretical analysis and micromagnetic characterization confirmed that the local stress distribution by the topographic confinement dominates the forming mechanism of the directed magnetization.
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http://dx.doi.org/10.1021/acs.nanolett.1c00070DOI Listing
April 2021

Nanoparticle Shape Determines Dynamics of Targeting Nanoconstructs on Cell Membranes.

J Am Chem Soc 2021 Mar 18;143(12):4550-4555. Epub 2021 Mar 18.

Nanoparticle carriers are effective drug delivery vehicles. Along with other design parameters including size, composition, and surface charge, particle shape strongly influences cellular uptake. How nanoparticle geometry affects targeted delivery under physiologically relevant conditions, however, is inconclusive. Here, we demonstrate that nanoconstruct core shape influences the dynamics of targeting ligand-receptor interactions on cancer cell membranes. By single-particle tracking of translational and rotational motion, we compared DNA aptamer AS1411 conjugated gold nanostars (AS1411-AuNS) and 50 nm gold spheres (AS1411-50NPs) on cells with and without targeted nucleolin membrane receptors. On nucleolin-expressing cells, AS1411-AuNS exhibited faster velocities under directed diffusion and translated over larger areas during restricted diffusion compared to AS1411-50NPs, despite their similar protein corona profiles. On nucleolin-inhibited cells, AS1411-AuNS showed faster rotation dynamics over smaller translational areas, while AS1411-50NPs did not display significant changes in translation. These differences in translational and rotational motions indicate that nanoparticle shape affects how targeting nanoconstructs bind to cell-membrane receptors.
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http://dx.doi.org/10.1021/jacs.1c00850DOI Listing
March 2021

Identification of Brillouin Zones by In-Plane Lasing from Light-Cone Surface Lattice Resonances.

ACS Nano 2021 Mar 9;15(3):5567-5573. Epub 2021 Mar 9.

Graduate Program in Applied Physics, Northwestern University, Evanston, Illinois 60208, United States.

Because of translational symmetry, electromagnetic fields confined within 2D periodic optical structures can be represented within the first Brillouin zone (BZ). In contrast, the wavevectors of scattered electromagnetic fields outside the lattice are constrained by the 3D light cone, the free-photon dispersion in the surrounding medium. Here, we report that light-cone surface lattice resonances (SLRs) from plasmonic nanoparticle lattices can be used to observe the radiated electromagnetic fields from extended BZ edges. Our coupled dipole radiation theory reveals how lattice geometry and induced surface plasmon dipole orientation affect angular distributions of the radiated fields. Using dye molecules as local dipole emitters to excite the light-cone SLR modes, we experimentally identified high-order BZ edges by directional, in-plane lasing emission. These results provide insight into nanolaser architectures that can emit at multiple wavelengths and in-plane directions simply by rotating the nanocavity lattice.
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http://dx.doi.org/10.1021/acsnano.1c00449DOI Listing
March 2021

Light-Mediated Directed Placement of Different DNA Sequences on Single Gold Nanoparticles.

J Am Chem Soc 2021 Mar 4;143(10):3671-3676. Epub 2021 Mar 4.

This paper describes the light-directed functionalization of anisotropic gold nanoparticles with different thiolated-DNA oligomer (oligo) sequences. The starting nanoconstructs are gold nanostars (AuNS) uniformly grafted with one oligo sequence that are then exposed to fs-laser pulses at the plasmon resonance of the branches. The excitation selectively cleaves Au-S bonds at the tips of the branches to create vacant areas for functionalization with a different thiolated oligo sequence. Nanoconstructs synthesized by this approach present one oligo sequence on the AuNS body and branches and a different sequence at the tips. This process enables the formation of nanoparticle superstructures consisting of AuNS cores and small Au satellite nanoparticles at controlled locations after DNA hybridization. Our strategy enables selective oligo presentation at the single-particle level and opens prospects for sophisticated design of nanoscale assemblies that are important in a wide range of biological applications.
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http://dx.doi.org/10.1021/jacs.0c11699DOI Listing
March 2021

Plasmonic Photoelectrocatalysis in Copper-Platinum Core-Shell Nanoparticle Lattices.

Nano Lett 2021 Feb 28;21(3):1523-1529. Epub 2021 Jan 28.

Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.

This paper reports that strongly coupled bimetallic core-shell nanoparticle arrays show photoelectrocatalytic activity for hydrogen evolution reactions (HER). We fabricated large-area Cu-Pt nanoparticle lattices by combining top-down lithography and solution-based chemistry. These coupled lattices support two different types of plasmon modes, localized surface plasmons from individual particles and surface lattice resonances (SLRs) from the 2D lattice, that increased HER catalytic activity under white-light illumination up to 60%. Comparing photoelectrocatalytic performances of the two plasmon modes at different wavelength ranges, we found that SLRs had two-fold activity enhancement over that from localized surface plasmons.
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http://dx.doi.org/10.1021/acs.nanolett.0c05029DOI Listing
February 2021

Celebrating 20 years of .

Authors:
Teri W Odom

Nano Lett 2021 01;21(1):1-2

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http://dx.doi.org/10.1021/acs.nanolett.0c05010DOI Listing
January 2021

Single-Nanoparticle Orientation Sensing by Deep Learning.

ACS Cent Sci 2020 Dec 9;6(12):2339-2346. Epub 2020 Nov 9.

Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.

This paper describes a computational imaging platform to determine the orientation of anisotropic optical probes under differential interference contrast (DIC) microscopy. We established a deep-learning model based on data sets of DIC images collected from metal nanoparticle optical probes at different orientations. This model predicted the in-plane angle of gold nanorods with an error below 20°, the inherent limit of the DIC method. Using low-symmetry gold nanostars as optical probes, we demonstrated the detection of in-plane particle orientation in the full 0-360° range. We also showed that orientation predictions of the same particle were consistent even with variations in the imaging background. Finally, the deep-learning model was extended to enable simultaneous prediction of in-plane and out-of-plane rotation angles for a multibranched nanostar by concurrent analysis of DIC images measured at multiple wavelengths.
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http://dx.doi.org/10.1021/acscentsci.0c01252DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7760486PMC
December 2020

Soft skin layers for reconfigurable and programmable nanowrinkles.

Nanoscale 2020 Dec 26;12(47):23920-23928. Epub 2020 Nov 26.

Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.

Wrinkling skin layers on pre-strained polymer sheets has drawn significant interest as a method to create reconfigurable surface patterns. Compared to widely studied metal or silica films, softer polymer skins are more tolerant to crack formation when the surface topography is tuned under applied strain. This Mini-review discusses recent progress in mechano-responsive wrinkles based on polymer skin materials. Control over the skin thickness with nanometer accuracy allows for tuning of the wrinkle wavelength and orientation over length scales from nanometer to micrometer regimes. Furthermore, soft skin layers enable texturing of two-dimensional electronic materials with programmable feature sizes and structural hierarchy because of the conformal adhesion to the substrates. Soft skin systems open prospects to tailor a range of surface properties via external stimuli important for applications such as smart windows, microfluidics, and nanoelectronics.
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http://dx.doi.org/10.1039/d0nr07054hDOI Listing
December 2020

Ultranarrow plasmon resonances from annealed nanoparticle lattices.

Proc Natl Acad Sci U S A 2020 09 8;117(38):23380-23384. Epub 2020 Sep 8.

Department of Chemistry, Northwestern University, Evanston, IL 60208;

This paper reports how the spectral linewidths of plasmon resonances can be narrowed down to a few nanometers by optimizing the morphology, surface roughness, and crystallinity of metal nanoparticles (NPs) in two-dimensional (2D) lattices. We developed thermal annealing procedures to achieve ultranarrow surface lattice resonances (SLRs) with full-width at half-maxima linewidths as narrow as 4 nm from arrays of Au, Ag, Al, and Cu NPs. Besides annealing, we developed a chemical vapor deposition process to use Cu NPs as catalytic substrates for graphene growth. Graphene-encapsulated Cu NPs showed the narrowest SLR linewidths (2 nm) and were stable for months. These ultranarrow SLR nanocavity modes supported even narrower lasing emission spectra and high nonlinearity in the input-output light-light curves.
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http://dx.doi.org/10.1073/pnas.2008818117DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7519217PMC
September 2020

Endosomal Organization of CpG Constructs Correlates with Enhanced Immune Activation.

Nano Lett 2020 08 31;20(8):6170-6175. Epub 2020 Jul 31.

This Letter describes how the endosomal organization of immunostimulatory nanoconstructs can tune the activation of macrophages. Nanoconstructs composed of gold nanoparticles conjugated with unmethylated cytosine-phosphate-guanine (CpG) oligonucleotides have distinct endosomal distributions depending on the surface curvature. Mixed-curvature constructs produce a relatively high percentage of hollow endosomes, where constructs accumulated primarily along the interior edges. These constructs achieved a higher level of toll-like receptor (TLR) 9 activation along with the enhanced secretion of proinflammatory cytokines and chemokines compared to constant-curvature constructs that aggregated mostly in the center of the endosomes. Our results underscore the importance of intraendosomal interactions in regulating immune responses and targeted delivery.
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http://dx.doi.org/10.1021/acs.nanolett.0c02536DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7609249PMC
August 2020

Creation of Single-Photon Emitters in WSe Monolayers Using Nanometer-Sized Gold Tips.

Nano Lett 2020 Aug 16;20(8):5866-5872. Epub 2020 Jul 16.

Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States.

Due to their tunable bandgaps and strong spin-valley locking, transition metal dichalcogenides constitute a unique platform for hosting single-photon emitters. Here, we present a versatile approach for creating bright single-photon emitters in WSe monolayers by the deposition of gold nanostars. Our molecular dynamics simulations reveal that the formation of the quantum emitters is likely caused by the highly localized strain fields created by the sharp tips of the gold nanostars. The surface plasmon modes supported by the gold nanostars can change the local electromagnetic fields in the vicinity of the quantum emitters, leading to their enhanced emission intensities. Moreover, by correlating the emission energies and intensities of the quantum emitters, we are able to associate them with two types of strain fields and derive the existence of a low-lying dark state in their electronic structures. Our findings are highly relevant for the development and understanding of single-photon emitters in transition metal dichalcogenide materials.
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http://dx.doi.org/10.1021/acs.nanolett.0c01789DOI Listing
August 2020