Publications by authors named "Cailei Yuan"

20 Publications

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An individual sandwich hybrid nanostructure of cobalt disulfide in-situ grown on N doped carbon layer wrapped on multi-walled carbon nanotubes for high-efficiency lithium sulfur batteries.

J Colloid Interface Sci 2021 Nov 20. Epub 2021 Nov 20.

School of Materials Science and Engineering, Nanchang University, Jiangxi 330031, PR China; Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Jiangxi 330031, PR China. Electronic address:

Binding and trapping of lithium polysulfide (LPS) are being conceived as the most effective strategies to improve lithium-sulfur (Li-S) battery performance. Therefore, exploiting a simple but cost-effective approach for the absorption and conversion of LPS and the transfer of electrons and Li ions is of paramount importance. Herein, sandwich structure [email protected]@CoS integrated with multiple nanostructures of zero-dimensional (0D) CoS nanoparticles, 1D carbon nanotubes (CNTs), and 2D N-doped amorphous carbon layer was obtained, where MWCNTs was firstly uniformly attached with a polydopamine (PDA) of excellent adhesion, followed by hydrothermal method, the Co nanoparticles were in-situ grown on the PDA by the formation of complex compound of Co and N atoms in PDA, and then the CoS nanoparticles were in-situ grown on CNTs in a point-surface contact way by a bridging of N-doped amorphous carbon layer derived from the carbonization of attached PDA after the vulcanization at 500 °C under Ar atmosphere. The multifunction synergism of absorption, conductivity, and the kinetics of LPS redox is significantly improved, consequently effectively suppressing the shuttle effect and tremendously increasing the utilization rate of active substance. For the Li-S battery assembled with [email protected]@CoS-modified separator, its rate capacity and cycling performance can be greatly enhanced. It can exhibit a high initial discharge capacity of 1590 mAh g at 0.1 C, a stable long-term cycling performance with a relatively low capacity decay of 0.07% per cycle during 500 cycles at 1 C, and a reversible capacity of 772 mAh g and a capacity decay of 0.04% per cycle during 250 cycles at 2 C. Even at a large current density of 4 C, an initial specific discharge capacity of 634 mAh g can still be delivered. With a high sulfur loading of 5.0 mg cm, additionally, an outstanding cycling stability can also be well maintained at 685 mAh g at 0.1 C after 50 cycles. This work provides a novel and simple but effective strategy to develop such sandwich hybrid materials comprised of polar metal sulfides and conductive networks via an effective bridging to help realize durable and stable Li-S battery.
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http://dx.doi.org/10.1016/j.jcis.2021.11.102DOI Listing
November 2021

Highly Mesoporous Cobalt-Hybridized 2D CuP Nanosheet Arrays as Boosting Janus Electrocatalysts for Water Splitting.

Inorg Chem 2021 Nov 22. Epub 2021 Nov 22.

Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang, 330022 Jiangxi, P. R. China.

Recently, developing economical electrocatalysts with high performance in water decomposition has become a research hotspot. Herein, two kinds of cobalt-hybridized CuP nanostructure array electrocatalysts (including highly mesoporous 2D nanosheets and sugar gourd-like 1D nanowires) were controllably grown on a nickel foam substrate through a simple hydrothermal method combined with a subsequent phosphating treatment method. An electrocatalytic test indicated that the as-prepared 2D nanosheet array exhibited excellent activity and stability toward hydrogen evolution reaction under alkaline conditions, which offered a low overpotential of 99 mV at 10 mA/cm and a small Tafel slope of 70.4 mV/dec, whereas a competitive overpotential of 272 mV was required for oxygen evolution reaction. In addition, the 2D nanosheet array delivered a low cell voltage of 1.66 V at 10 mA/cm in a symmetric two-electrode system, implying its huge potential in overall water decomposition. The electrocatalytic performance is superior to the as-prepared 1D nanowire array and most of the CuP-related electrocatalysts previously reported. Experimental measurements and first-principles calculations show that the excellent performance of the 2D nanosheet array can be attributed to its unique 2D mesoporous structure and hybridization of cobalt, which not only provide a large electrochemically active surface and fast electrocatalytic reaction kinetics but also weaken the binding strength of electrocatalytic reaction intermediates. The present study provides a simple and controllable approach to synthesize CuP-based bimetallic phosphide nanostructures, which can be used as boosting Janus electrocatalysts for water decomposition.
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http://dx.doi.org/10.1021/acs.inorgchem.1c02954DOI Listing
November 2021

Active Site Engineering in [email protected]/Graphene Heterostructures Enabling Enhanced Hydrogen Evolution.

Inorg Chem 2021 Nov 14;60(21):16761-16768. Epub 2021 Oct 14.

Institute of Advanced Materials (IAM), College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China.

As the core of an electrocatalyst, the active site is critical to determine its catalytic performance in the hydrogen evolution reaction (HER). In this work, porous N-doped carbon-encapsulated CoP nanoparticles on both sides of graphene ([email protected]/GR) are derived from a bimetallic metal-organic framework (MOF)@graphene oxide composite. Through active site engineering by tailoring the environment around CoP and engineering the structure, the HER activity of [email protected]/GR heterostructures is significantly enhanced. Both X-ray photoelectron spectroscopy (XPS) results and density functional theory (DFT) calculations manifest that the electronic structure of CoP can be modulated by the carbon matrix of NC/GR, resulting in electron redistribution and a reduction in the adsorption energy of hydrogen (Δ) from -0.53 to 0.04 eV. By engineering the sandwich-like structure, active sites in [email protected]/GR are further increased by optimizing the Zn/Co ratio in the bimetallic MOF. Benefiting from this active site engineering, the [email protected]/GR electrocatalyst exhibits small overpotentials of 105 mV in 0.5 M HSO (or 125 mV in 1 M KOH) to 10 mA cm, accelerated HER kinetics with a low Tafel slope of 47.5 mV dec, and remarkable structural and HER stability.
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http://dx.doi.org/10.1021/acs.inorgchem.1c02639DOI Listing
November 2021

General synthesis of mixed-dimensional van der Waals heterostructures with hexagonal symmetry.

Nanotechnology 2021 Oct 14;32(50). Epub 2021 Oct 14.

Department of Physics, Nanchang University, Nanchang 330031, People's Republic of China.

The combination of two-dimensional (2D) materials with non-2D materials (quantum dots, nanowires and bulk materials), i.e. mixed-dimensional van der Waals (md-vdW) heterostructures endow 2D materials with remarkable electronics properties. However, it remains a big challenge to synthesize md-vdW heterostructures because of the difference of crystal symmetry between 2D and non-2D materials. Meanwhile, it is difficult to initiate the nucleation due to the lack of chemical active sites on chemical inert surfaces of 2D materials. Herein, we design a general chemical vapor deposition method for synthesizing a broad class of md-vdW heterostructures with well-aligned hexagonal symmetry including MoS/FeS, MoS/CoS, MoS/MnS, MoS/ZnS, Mo(SSe)/ZnSSe, Mo(SSe)/CdSSe. Combining with DFT calculation, we find that the hexagonal symmetry and the centered clusters of MoSand Mo(SSe)nanoflakes are two crucial factors to launch the hexagonally oriented growth and nucleation of non-2D materials on 2D materials. Our discovery opens an opportunity for the versatile hetero-integration of 2D materials and allows systematic investigation of physical properties in a wide variety of md-vdW heterostructures.
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http://dx.doi.org/10.1088/1361-6528/ac291dDOI Listing
October 2021

Elimination of Interlayer Potential Barriers of Chromium Sulfide by Self-Intercalation for Enhanced Hydrogen Evolution Reaction.

ACS Appl Mater Interfaces 2021 Mar 9;13(11):13055-13062. Epub 2021 Mar 9.

Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, Jiangxi, China.

The van der Waals (vdW) gaps in layered transition-metal dichalcogenides (TMDs) with an interlayer poor charge transport are considered the bottleneck for higher hydrogen evolution reaction (HER) performance of TMDs. Filling the vdW gap of TMDs materials with intercalants is considered a good way to generate new interesting properties. However, postsynthesis intercalation with foreign atoms may bring extra crystalline imperfections and low yields. In this work, to overcome the interlayer potential barriers of TMDs, CrS-Cr-CrS is produced by naturally self-intercalating native Cr atom plane into the vdW layered CrS. The CrS-Cr-CrS exhibits strong chemical bonds and high electrical conductivity, which can provide excellent HER electrocatalytic performance. Moreover, based on the first-principles calculations and experimental verification, the intercalated Cr atoms exhibit a Gibbs free energy of the adsorbed hydrogen close to zero and could further improve the electrocatalytic HER performance. Our work provides a new view in self-intercalation for electrocatalysis applications.
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http://dx.doi.org/10.1021/acsami.0c20577DOI Listing
March 2021

MoS Nanoribbons with a Prolonged Photoresponse Lifetime for Enhanced Visible Light Photoelectrocatalytic Hydrogen Evolution.

Inorg Chem 2021 Feb 11;60(3):1991-1997. Epub 2021 Jan 11.

Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, Jiangxi, China.

The high recombination rate of photoinduced electron-hole pairs limits the hydrogen production efficiency of the MoS catalyst in photoelectrochemical (PEC) water splitting. The strategy of prolonging the lifetime of photoinduced carriers is of great significance to the promotion of photoelectrocatalytic hydrogen production. An ideal approach is to utilize edge defects, which can capture photoinduced electrons and thus slow down the recombination rate. However, for two-dimensional MoS, most of the surface areas are inert basal planes. Here, a simple method for preparing one-dimensional MoS nanoribbons with abundant inherent edges is proposed. The MoS nanoribbon-based device has a good spectral response in the range of 400-500 nm and has a longer lifetime of photoinduced carriers than other MoS nanostructure-based photodetectors. An improved PEC catalytic performance of these MoS nanoribbons is also experimentally verified under the illumination of 405 nm by using the electrochemical microcell technique. This work provides a new strategy to prolong the lifetime of photoinduced carriers for further improvement of PEC activity, and the evaluation of photoelectric performance provides a feasible way for transition-metal dichalcogenides to be widely used in the energy field.
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http://dx.doi.org/10.1021/acs.inorgchem.0c03478DOI Listing
February 2021

Tunable Surface Selenization on MoO -Based Carbon Substrate for Notably Enhanced Sodium-Ion Storage Properties.

Small 2020 Oct 20;16(41):e2001905. Epub 2020 Sep 20.

Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang, 330022, P. R. China.

Transition metal chalcogenides with high theoretical capacity are promising conversion-type anode materials for sodium ion batteries (SIBs), but often suffer from unsatisfied cycling stability (hundreds of cycles) caused by structural collapse and agglomerate. Herein, a rational strategy of tunable surface selenization on highly crystalline MoO -based carbon substrate is designed, where the sheet-like MoSe can be coated on the surface of bundle-like N-doped carbon/granular MoO substrate, realizing partial transformation from MoO to MoSe , and creating b-NC/g-MoO @s-MoSe -10 with robust hierarchical MoO @MoSe heterostructures and strong chemical couplings (MoC and MoN). Such well-designed architecture can provide signally improved reaction kinetics and reinforced structural integrity for fast and stable sodium-ion storage, as confirmed by the ex situ results and kinetic analyses as well as the density functional theory calculations. As expected, the b-NC/g-MoO @s-MoSe -10 delivers splendid rate capability and ultralong cycling stability (254.2 mAh g reversible capacity at 5.0 A g after 6000 cycles with ≈89.0% capacity retention). Therefore, the tunable surface strategy can provide new insights for designing and constructing heterostructures of transition metal chalcogenides toward high-performance SIBs.
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http://dx.doi.org/10.1002/smll.202001905DOI Listing
October 2020

Magnetic Enhancement for Hydrogen Evolution Reaction on Ferromagnetic MoS Catalyst.

Nano Lett 2020 Apr 26;20(4):2923-2930. Epub 2020 Mar 26.

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Numerous efforts in improving the hydrogen evolution reaction (HER) performance of transition metal dichalcogenides mostly focus on active sites exposing, vacancy engineering, and phase engineering. However, little room is left for improvement in these approaches. It should be noted that efficient electron transfer also plays a crucial role in catalytic activity. In this work, by employment of an external vertical magnetic field, ferromagnetic bowl-like MoS flakes can afford electrons transmitting easily from a glassy carbon electrode to active sites to drive HER, and thus perform magnetic HER enhancement. The ferromagnetic bowl-like MoS flakes with an external vertical magnetic field can provide a roughly doubled current density compared to that without an external vertical magnetic field at a constant overpotential of -150 mV. Our work may provide a new pathway to break the bottleneck for further improvement of HER performance and also paves the way to utilize the magnetic enhancement in widely catalytic application.
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http://dx.doi.org/10.1021/acs.nanolett.0c00845DOI Listing
April 2020

Encapsulating N-Doped Carbon Nanorod Bundles/MoO Nanoparticles via Surface Growth of Ultrathin MoS Nanosheets for Ultrafast and Ultralong Cycling Sodium Storage.

ACS Appl Mater Interfaces 2020 Feb 27;12(5):6205-6216. Epub 2020 Jan 27.

Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics , Jiangxi Normal University , Nanchang , Jiangxi 330022 , People's Republic of China.

Conversion-type anode materials possess high theoretical capacity for sodium-ion batteries (SIBs), owing to multi-electron transmission (2-6 electrons). Mo-based chalcogenides are a class of great promise, high-capacity host materials, but their development still undergoes serious volume changes and low transport kinetics during the cycling process. Here, MoO nanoparticles anchored on N-doped carbon nanorod bundles (N-CNRBs/MoO) are synthesized by a facile self-polymerized route and a following annealing. After hydrothermal sulfuration, N-CNRBs/MoO composites are encapsulated by surface growth of ultrathin MoS nanosheets, acquiring hierarchical N-CNRBs/[email protected] composites. Serving as the SIB anode, the N-CNRBs/[email protected] electrode exhibits significantly improved sodium-ion storage properties. The reversible capacity is up to 554.4 mA h g at 0.05 A g and maintains 249.3 mA h g even at 10.0 A g. During 5000 cycles, no obvious capacity decay is observed and the reversible capacities retain 334.8 mA h g at 3.0 A g and 301.4 mA h g at 5.0 A g. These properties could be ascribed to the vertical encapsulation of MoS nanosheets on high-crystalline N-CNRBs/MoO substrates. The hierarchical architecture and unique heterostructure between MoO and MoS synergistically facilitate sodium-ion diffusion, relieve volume changes, and boost pseudocapacitive charge storage of N-CNRBs/[email protected] electrode. Therefore, the rational growth of nanosheets on complex substrates shows promising potential to construct anode materials for high-performance batteries.
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http://dx.doi.org/10.1021/acsami.9b18851DOI Listing
February 2020

Crystal facets engineering and rGO hybridizing for synergistic enhancement of photocatalytic activity of nickel disulfide.

J Hazard Mater 2020 02 19;384:121402. Epub 2019 Oct 19.

Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, PR China. Electronic address:

Crystal facets engineering and graphene hybridizing have been proved to be effective means to improve the photocatalytic activities of semiconductor photocatalysts in recent years. However, most of these efforts are concentrated in metal oxides. In the present study, crystal facets effect on the photocatalytic activity of metal sulfide NiS was studied for the first time. It was found that the {111}-faceted NiS nanocrystals showed improved photocatalytic activity in the degradation of various typical pollutants in water compared with {100}-faceted NiS nanocrystals. Moreover, through hybridizing with rGO nanosheets, the photocatalytic activity of the {111}-faceted NiS nanocrystals can be further improved, resulting in the complete degradation of heavy metal hexavalent chromium and organic dyes. The photocatalytic mechanism was studied in detail through theory calculation and experimental characterization. It was found that both the surface energies of Ni-terminated and S-terminated {111} facets were much higher than that of {100} facets, indicating that {111} facets were more active. Besides, rGO hybridizing can realize the effective separation of photogenerated electrons and holes. The results provide important guidance for the further development of efficient metal sulfide photocatalysts.
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http://dx.doi.org/10.1016/j.jhazmat.2019.121402DOI Listing
February 2020

Wafer-Scale Sulfur Vacancy-Rich Monolayer MoS for Massive Hydrogen Production.

J Phys Chem Lett 2019 Aug 7;10(16):4763-4768. Epub 2019 Aug 7.

Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics , Jiangxi Normal University , 99 Ziyang Avenue , Nanchang 330022 , Jiangxi , China.

As one of the promising low-cost and high-efficiency catalysts for the electrochemical hydrogen evolution reaction (HER), it is well-known that there are both tiny exposed catalytic active edge sites and large-area inert basal planes in two-dimensional MoS structures. For enhancing its HER activity, extensive work has been done to activate the inert basal plane of MoS. In this article, wafer-scale (2 in.) continuous monolayer MoS films with substantial in situ generated sulfur vacancies are fabricated by employing the laser molecular beam epitaxy process benefitting from ultrahigh vacuum growth condition and high substrate temperature. The intrinsic sulfur vacancies throughout the wafer-scale basal plane present an ideal electrocatalytic platform for massive hydrogen production. The fabricated vacancy-rich monolayer MoS can achieve a current density of -10 mA/cm at an overpotential of -256 mV. The wafer-scale fabrications of sulfur vacancy-rich monolayer MoS provide great leaps forward in the practical application of MoS for massive hydrogen production.
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http://dx.doi.org/10.1021/acs.jpclett.9b01399DOI Listing
August 2019

Two-photon and three-photon absorption in ZnO nanocrystals embedded in AlO matrix influenced by defect states.

Opt Lett 2019 Jan;44(1):179-182

The broadband nonlinear absorption in ZnO nanocrystals embedded in AlO matrix was investigated by Z-scan and pump-probe techniques from 400 nm to 800 nm. The effective two-photon absorption and three-photon absorption coefficients were determined to be ∼1.1×10  cm/GW at 400 nm and ∼1.1×10  cm/GW at 800 nm, respectively, which are at least two orders of magnitude greater than that in ZnO bulk crystal. It may be attributed to the defect-states-mediated multiphoton absorption process, which was proofed by comparison experiments with different densities of interfacial defect states. The corresponding lifetimes for the intraband relaxation, defect-states trapping, and interband recombination processes were measured by femtosecond transient absorption measurements as τ1 ∼ 1  ps, τ2 ∼ 13  ps, and τ3 ∼ 350  ps, respectively.
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http://dx.doi.org/10.1364/OL.44.000179DOI Listing
January 2019

One-Dimensional Zinc Oxide Decorated Cobalt Oxide Nanospheres for Enhanced Gas-Sensing Properties.

Front Chem 2018 17;6:628. Epub 2018 Dec 17.

Jiangxi Key Laboratory of Nanomaterials and Sensors Jiangxi Normal University, Nanchang, China.

In this study, one-dimensional (1D) zinc oxide was loaded on the surface of cobalt oxide microspheres, which were assembled by single-crystalline porous nanosheets, via a simple heteroepitaxial growth process. This elaborate structure possessed an excellent transducer function from the single-crystalline feature of CoO nanosheets and the receptor function from the zinc oxide nanorods. The structure of the as-prepared hybrid was confirmed via a Scanning Electron Microscope (SEM), X-ray diffraction (XRD), and a Transmission Electron Microscope (TEM). Gas-sensing tests showed that the gas-sensing properties of the as-designed hybrid were largely improved. The response was about 161 (R/R) to 100 ppm ethanol, which is 110 and 10 times higher than that of CoO (R/R = 1.47) and ZnO (R/R = 15), respectively. And the as-designed ZnO/CoO hybrid also showed a high selectivity to ethanol. The superior gas-sensing properties were mainly attributed to the as-designed nanostructures that contained a super transducer function and a super receptor function. The design strategy for gas-sensing materials in this work shed a new light on the exploration of high-performance gas sensors.
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http://dx.doi.org/10.3389/fchem.2018.00628DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6304346PMC
December 2018

High selectivity of sulfur-doped SnO in NO detection at lower operating temperatures.

Nanoscale 2018 Nov;10(44):20761-20771

Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, P.R. China.

Resistive gas sensors based on metal oxides have aroused great interest in the sensing of NO2 gas due to their low cost, good stability, and easy fabrication. However, drawbacks such as low sensitivity and a lack of selectivity, which originate from the limited kinds of intrinsic active centers on the surface of the metal oxides that could be involved in the gas-sensing reaction, remain great challenges to overcome. To solve these problems, surface modification of SnO2 by S-doping was carried out by the sintering of flower-like SnS2. Gas-sensing tests revealed that the S-doped SnO2 showed ultra-high sensitivity to NO2 (Rg/Ra = 600 toward 5 ppm) with low optimal operating temperature (50 °C). The detection limit of the sensor was as low as 50 ppb (Rg/Ra = 11). Notably, the S-doped SnO2 showed negligible cross-responses to alcohol, acetone, HCHO, SO2, H2S, and xylene. The ultra-high sensitivity and selectivity toward NO2 were closely related to the content of the S-dopant. This phenomenon is attributed to the active role of S-dopant during the surface reactions with NO2, which was substantiated by in situ Raman characterization and DFT-based calculations. This study offers an important guide for surface modification by doping to improve the sensitivity and selectivity of metal oxides and sheds new light on material design to develop resistive gas sensors for NO2 detection.
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http://dx.doi.org/10.1039/c8nr05649hDOI Listing
November 2018

FKBP8 inhibits virus-induced RLR-VISA signaling.

J Med Virol 2019 03 21;91(3):482-492. Epub 2018 Nov 21.

Key Laboratory of Functional Small Organic Molecules, Ministry of Education and College of Life Science, Jiangxi Normal University, Nanchang, China.

The mitochondrial antiviral signal protein mitochondrial antiviral signaling protein, also known as virus-induced signaling adaptor (VISA), plays a key role in regulating host innate immune signaling pathways. This study identifies FK506 binding protein 8 (FKBP8) as a candidate interacting protein of VISA through the yeast two-hybrid technique. The interaction of FKBP8 with VISA, retinoic acid inducible protein 1 (RIG-I), and IFN regulatory factor 3 (IRF3) was confirmed during viral infection in mammalian cells by coimmunoprecipitation. Overexpression of FKBP8 using a eukaryotic expression plasmid significantly attenuated Sendai virus-induced activation of the promoter interferons β (IFN-β), and transcription factors nuclear factor κ-light chain enhancer of activated B cells (NF-κB) and IFN-stimulated response element (ISRE). Overexpression of FKBP8 also decreased dimer-IRF3 activity, but enhanced virus replication. Conversely, knockdown of FKBP8 expression by RNA interference showed opposite effects. Further studies indicated that FKBP8 acts as a negative interacting partner to regulate RLR-VISA signaling by acting on VISA and TANK binding kinase 1 (TBK1). Additionally, FKBP8 played a negative role on virus-induced signaling by inhibiting the formation of TBK1-IRF3 and VISA-TRAF3 complexes. Notably, FKBP8 also promoted the degradation of TBK1, RIG-I, and TRAF3 resulting from FKBP8 reinforced Sendai virus-induced endogenous polyubiquitination of RIG-I, TBK1, and TNF receptor-associated factor 3 (TRAF3). Therefore, a novel function of FKBP8 in innate immunity antiviral signaling regulation was revealed in this study.
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http://dx.doi.org/10.1002/jmv.25327DOI Listing
March 2019

Laminated bilayer MoS with weak interlayer coupling.

Nanoscale 2018 Jan;10(3):1145-1152

Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, Jiangxi, China.

Laminated bilayer MoS structures are prepared with MoS nanoparticles trapped between two individual MoS layers which can prevent the formation of a true stacking structure held together by van der Waals interaction. The laminated bilayer MoS clearly indicates a weak interlayer coupling with reduced van der Waals interaction between adjacent layers. As the interlayer coupling is insufficient to modify the band structure of MoS, the laminated bilayer MoS can retain the direct bandgap structure of an isolated monolayer. Furthermore, by controlling the size of the MoS nanoparticles trapped in between, the interlayer distance and interlayer coupling of bilayer MoS structures can be engineered in a wide range, resulting in different bandgap behaviors. This finding is extremely important as it provides an effective approach to fabricate bandgap engineered bilayer MoS structures, which is a crucial step forward to making multi-layer MoS-based p-n junctions and homo/hetero-structures, and thus advanced electronic devices, especially optoelectronic devices. This approach is applied to not only bilayer MoS structures, but also other layer structured two-dimensional materials.
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http://dx.doi.org/10.1039/c7nr07569cDOI Listing
January 2018

Improved ethanol gas sensing performances of a ZnO/CoO composite induced by its flytrap-like structure.

Phys Chem Chem Phys 2017 Nov;19(43):29601-29607

Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, P. R. China.

Nanocomposite materials with excellent receptor and transducer functions are promising in ameliorating their gas sensing properties. However, due to the abrupt changes of receptor and transducer functions when different components are combined together, structural engineering that considers both the receptor and transducer functions to design such desirable sensing materials still remains a great challenge. Here, a nanocomposite material composed of 1D ZnO nanorods and 3D CoO microspheres assembled by single-crystalline porous nanosheets has been designed, which was inspired by the high-efficiency receptor-transducer-response structure of venus flytraps. The as-designed ZnO/CoO composite exhibited high response (R/R = 125 to 100 ppm ethanol) which was 84 times and 8 times higher than those of CoO (R/R = 1.43) and ZnO (R/R = 15). The excellent sensing properties are ascribed to the as-designed flytrap-like structure which possesses a super receptor function from 1D ZnO with a large surface area, p-n heterojunctions with an amplified response signal, as well as excellent transducer functions from single-crystalline porous CoO with fast charge transport channels. This strategy provides us with new guidance on the exploration of high-performance gas sensors which could further extend to other bio-structures that are abundant in nature.
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http://dx.doi.org/10.1039/c7cp05228fDOI Listing
November 2017

Enhanced Gas-Sensing Properties of the Hierarchical TiO₂ Hollow Microspheres with Exposed High-Energy {001} Crystal Facets.

ACS Appl Mater Interfaces 2015 Nov 2;7(44):24902-8. Epub 2015 Nov 2.

Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University , Nanchang 330022, Jiangxi, P.R. China.

Anatase hierarchical TiO2 with innovative designs (hollow microspheres with exposed high-energy {001} crystal facets, hollow microspheres without {001} crystal facets, and solid microspheres without {001} crystal facets) were synthesized via a one-pot hydrothermal method and characterized. Based on these materials, gas sensors were fabricated and used for gas-sensing tests. It was found that the sensor based on hierarchical TiO2 hollow microspheres with exposed high-energy {001} crystal facets exhibited enhanced acetone sensing properties compared to the sensors based on the other two materials due to the exposing of high-energy {001} crystal facets and special hierarchical hollow structure. First-principle calculations were performed to illustrate the sensing mechanism, which suggested that the adsorption process of acetone molecule on TiO2 surface was spontaneous, and the adsorption on high-energy {001} crystal facets would be more stable than that on the normally exposed {101} crystal facets. Further characterization indicated that the {001} surface was highly reactive for the adsorption of active oxygen species, which was also responsible for the enhanced sensing performance. The present studies revealed the crystal-facets-dependent gas-sensing properties of TiO2 and provided a new insight into improving the gas sensing performance by designing hierarchical hollow structure with special-crystal-facets exposure.
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http://dx.doi.org/10.1021/acsami.5b08372DOI Listing
November 2015

Monolayer-by-monolayer stacked pyramid-like MoS2 nanodots on monolayered MoS2 flakes with enhanced photoluminescence.

Nanoscale 2015 Nov;7(41):17468-72

Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, China.

The precise control of the morphology and crystal shape of MoS2 nanostructures is of particular importance for their application in nanoelectronic and optoelectronic devices. Here, we describe a single step route for the synthesis of monolayer-by-monolayer stacked pyramid-like MoS2 nanodots on monolayered MoS2 flakes using a chemical vapor deposition method. First-principles calculations demonstrated that the bandgap of the pyramid-like MoS2 nanodot is a direct bandgap. Enhanced local photoluminescence emission was observed in the pyramid-like MoS2 nanodot, in comparison with monolayered MoS2 flakes. The findings presented here provide new opportunities to tailor the physical properties of MoS2via morphology-controlled synthesis.
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http://dx.doi.org/10.1039/c5nr05363cDOI Listing
November 2015

Strain-induced matrix-dependent deformation of GaAs nanoparticles.

Nanoscale 2014 Jan;6(2):1119-23

Department of Physics, Jiangxi Normal University, Nanchang 330022, Jiangxi, China.

The influence of compressive strain on the deformation of GaAs nanoparticles embedded in different host matrices is investigated. The simulation results indicate that it can be easier to deform GaAs nanoparticles grown in an Al2O3 film than those in an SiO2 film. The deformation induced by the applied compressive strain has significant influence on the shape, size and microstructure of GaAs nanoparticles. Most significantly, these simulated results have a good agreement with HRTEM experimental results.
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http://dx.doi.org/10.1039/c3nr04551jDOI Listing
January 2014
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