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RhIr@mos2 nanohybrids based disposable microsensor for the point-of-care testing of NADH in real human serum

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Chinese Chemical Letters 2020年第8期31卷 2115-2118页

作者： Dongqing Ji Zi Ying Yuan Zhang Wei Chen Metini Janyasupab Xinghua Gao Lingyan Feng Weijia Wen Materials Genome Institute Shanghai UniversityShanghai 200444China State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences.Shanghai 200050China Department of Emergency Tongji HospitalTongji University School of MedicineShanghai 200065China Department of Electronics Engineering King Mongkut's Institute of Technology LadkrabangBangkok 10520Thailand

Dihydronicotinamide adenine dinucleotide(NADH)is an important enzyme in all living cells,which is found to be abnormally expressed in cancer cells.Since it is redox-active,an electrochemical detection method would be suitable for monitoring its concentration in biological fluids.Here we present a strategy for specific determination of NADH in real human serum by using RhIr@mos2 nanohybrids based microsensor.To implement the protocol,RhIr nanocrysrals are in-situ grown onto mos2 interlayers forming a nanohybrid structure(RhIr@mos2).After being locally deposited on an electrochemical microsensor,it could be used for the analysis of NADH.The developed RhIr@mos2 nanohybrids based microsensor possesses the ability for analyzing NADH at the applied potential of 0.07 V(much lower than most reported values).The detection limit is evaluated as low as 1 nmol/L even in bovine serum albumin(BSA)media.In addition,the sampling analysis of human serum from cancer patients and health controls shows that the microsensor displays good diagnostic sensitivity and specificity,illustrating that this developed detection technique is a relatively accurate method for measuring NADH in biological fluids.The proposed electrochemical microsensor assay also owns the benefits of convenience,disposable and easy processing,which make it a great possibility for future point-of-care cancer diagnosis.

关键词： mos2 Nanohybrid Electrochemical microsensor Point-of-care(POC)test Cancer diagnosis

Synthesis of MoX2 (X =Se or S) monolayers with high-concentration 1T'phase on 4H/fcc-Au nanorods for hydrogen evolution

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Nano Research 2019年第6期12卷 1301-1305页

作者： Zhengqing Liu Xiao Zhang Yue Gong Qipeng Lu Zhicheng Zhang Hongfei Cheng Qinglang Ma Junze Chen Meiting Zhao Bo Chen Ye Chen Xue-Jun Wu Pengfei Yin Lin Gu Yaping Du Hua Zhang School of Materials Science and Engineering & National Institute for Advanced Materials Nankai UniversityTianjin 300350China Center for Programmable Materials School of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100190China

Controlled synthesis of transition metal dichalcogenide (TMD) monolayers with unusual crystal phases has attracted increasing attention due to their promising applications in electrocatalysis.However,the facile and large-scale preparation of TMD monolayers with high-concentration unusual crystal phase still remains a challenge.Herein,we report the synthesis of MoX2 (X =Se or S) monolayers with high-concentration semimetallic 1T'phase by using the 4H/face-centered cubic (fcc)-Au nanorod as template to form the 4H/fcc-Au@MoX2 nanocomposite.The concentrations of 1T'phase in the prepared mose2 and mos2 monolayers are up to 86% and 81%,respectively.As a proof-of-concept application,the obtained Au@mos2 nanocomposite is used for the electrocatalytic hydrogen evolution reaction (HER) in acid medium,exhibiting excellent performance with a low overpotential of 178 mV at the current density of 10 mNcm^2,a small Tafel slope of 43.3 mV/dec,and excellent HER stability.This work paves a way for direct synthesis of TMD monolayers with high-concentration of unusual crystal phase for the electrocatalytic application.

关键词： mos2 monolayers semimetallic 1T'phase 4H/face-centered cubic (fcc)-Au nanorods hydrogen evolution

Facilitative effect of graphene quantum dots in mos_2 growth process by chemical vapor deposition

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Chinese Physics B 2018年第1期27卷 579-582页

作者：张璐王永生董艳芳赵宣付晨何大伟 Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University

The substrate treatment with seeding promoter can promote the two-dimensional material lateral growth in chemical vapor deposition （CVD） process. Herein, graphene quantum dots （GQDs） as a novel seeding promoter were used to obtain uniform large-area mos2 monolayer. The obtained monolayer mos2 films were confirmed by optical microscope, scanning electron microscope, Raman and photoluminescence spectra. Raman mapping revealed that the mos2 monolayer was largely homogeneous.

关键词： mos2 seed graphene quantum dots （GQDs） continuous film

Engineering the HER catalytic behavior of heteroatom-doped molybdenum disulfide via versatile partial cation exchange

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Journal of Energy Chemistry 2020年第2期29卷 15-19页

作者： Zhaoyan Luo Junjie Ge Changpeng Liu Wei Xing State Key Laboratory of Electroanalytical Chemistry Jilin Province Key Laboratory of Low Carbon Chemical PowerChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina University of Science and Technology of China Hefei 230026AnhuiChina

Water electrolysis is regarded as an environmental friendly and effective technique for large-scale hydrogen(H2)production[1,2].To date,Pt-based electrocatalysts are still the most efficient HER catalysts[3].However,the prohibitive cost and scarcity of precious metal catalysts have restricted its large-scale applications.Thus,finding an earth-abundant and effective alternative electrocatalysts is crucial to the development of‘hydrogen economy'.

关键词： Electrocatalyst mos2 Dual-metal doping Electron level matching Hydrogen evolution reaction

Gap plasmon-enhanced photoluminescence of monolayer mos_2 in hybrid nanostructure

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Chinese Physics B 2018年第4期27卷 408-412页

作者：余乐刘頔祁晓卓熊霄冯兰天李明郭国平郭光灿任希锋 Key Laboratory of Quantum Information Chinese Academy of SciencesUniversity of Science and Technology of China Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China

Monolayer transition-metal dichalcogenides（TMDs） have attracted a lot of attention for their applications in optics and optoelectronics.Molybdenum disulfide（mos2）,as one of those important materials,has been widely investigated due to its direct band gap and photoluminescence（PL） in visible range.Owing to the fact that the monolayer mos2 suffers low light absorption and emission,surface plasmon polaritons（SPPs） are used to enhance both the excitation and emission efficiencies.Here,we demonstrate that the PL of mos2 sandwiched between 200-nm-diameter gold nanoparticle（Au NP） and 150-nm-thick gold film is improved by more than 4 times compared with bare mos2 sample.This study shows that gap plasmons can possess more optical and optoelectronic applications incorporating with many other emerging two-dimensional materials.

关键词： mos2 surface plasmon polaritons gap plasmons

Nucleation mechanism and morphology evolution of mos_2 flakes grown by chemical vapor deposition

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Chinese Physics B 2017年第12期26卷 591-595页

作者：许贺菊米建松李云张彬丛日东傅广生于威 College of Physics Science and Technology Hebei University College of science North China University of Science and Technology

We study the nucleation mechanism and morphology evolution of mos2 flakes grown by chemical vapor deposition （CVD） on SiO2/Si substrates with using S and MoO3 powders. The mos2 flake is of monolayer with triangular nucleation, which might arise from the initial MoO3-x that is deposited on the substrate, and then bonded with S to form mos2 flake. The ratio of Mo and S is higher than 1：2 at the beginning with Mo terminated triangular nucleation formed. After that, the morphology of mos2 flake evolves from triangle to similar hexagon, then to truncated triangle which is determined by the faster growth speed of Mo termination than that of S termination under the S rich environment. The nucleation density does not increase linearly with the increase of reactant concentration, which could be explained by the two-dimensional nucleation theory.

关键词： mos2 chemical vapor deposition morphology nucleation

Atomically thin optical lenses and gratings

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Light(Science & Applications) 2016年第1期5卷 562-569页

作者： Jiong Yang Zhu Wang Fan Wang Renjing Xu Jin Tao Shuang Zhang Qinghua Qin Barry Luther-Davies Chennupati Jagadish Zongfu Yu Yuerui Lu Research School of Engineering College of Engineering and Computer Sciencethe Australian National UniversityCanberraACT 2601Australia Department of Electrical and Computer Engineering University of WisconsinMadisonWI 53706USA Department of Electronic Materials Engineering Research School of Physics and Engineeringthe Australian National UniversityCanberraACT 2601Australia CUDOS Laser Physics CentreResearch School of Physics and Engineeringthe Australian National UniversityCanberraACT 2601Australia

Two-dimensional(2D)materials have emerged as promising candidates for miniaturized optoelectronic devices due to their strong inelastic interactions with light.On the other hand,a miniaturized optical system also requires strong elastic light–matter interactions to control the flow of light.Here we report that a single-layer molybdenum disulfide(mos2)has a giant optical path length(OPL),around one order of magnitude larger than that from a single-layer of graphene.Using such giant OPL to engineer the phase front of optical beams we have demonstrated,to the best of our knowledge,the world’s thinnest optical lens consisting of a few layers of mos2 less than 6.3 nm thick.By taking advantage of the giant elastic scattering efficiency in ultra-thin high-index 2D materials,we also demonstrated high-efficiency gratings based on a single-or few-layers of mos2.The capability of manipulating the flow of light in 2D materials opens an exciting avenue towards unprecedented miniaturization of optical components and the integration of advanced optical functionalities.More importantly,the unique and large tunability of the refractive index by electric field in layered mos2 will enable various applications in electrically tunable atomically thin optical components,such as micro-lenses with electrically tunable focal lengths,electrical tunable phase shifters with ultra-high accuracy,which cannot be realized by conventional bulk solids.

关键词： atomically thin grating micro-lens mos2 two-dimensional

Controlling plasmon‐exciton interactions through photothermal reshaping

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Opto-Electronic Advances 2020年第1期3卷 8-15页

作者： Aiqin Hu Shuai Liu Jingyi Zhao Te Wen Weidong Zhang Qihuang Gong Yongqiang Meng Yu Ye Guowei Lu State Key Laboratory for Mesoscopic Physics Collaborative Innovation Center of Quantum MatterNano-optoelectronics Frontier Center of the Ministry of EducationSchool of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxi 030006China School of Materials Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China

We investigated the plasmon-exciton interactions in an individual gold nanorod(GNR)with monolayer mos2 at room temperature with the single-particle spectroscopy technique.To control the plasmon-exciton interaction,we tuned the local surface plasmon resonance of an individual GNR in-situ by employing the photothermal reshaping effect.The scattering spectra of the GNR-mos2 hybrids exhibited two dips at the frequencies of the A and B excitons of monolayer mos2,which were caused by the plasmon-induced resonance energy transfer effect.The resonance energy transfer rate increased when the surface plasmon resonance of the nanorod matched well with the exciton transition energy.Also,we demonstrated that the plasmon-enhanced fluorescence process dominated the photoluminescence of the GNR-mos2 hybrid.These results provide a flexible way to control the plasmon-exciton interaction in an all-solid-state operating system at room temperature.

关键词： gold nanorod mos2 hybrid scattering photoluminescence single nanoparticle

Stacking stability of mos_2 bilayer: An ab initio study

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Chinese Physics B 2014年第10期23卷 411-416页

作者：陶鹏郭怀红杨腾张志东 Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The study of the stacking stability of bilayer mos2 is essential since a bilayer has exhibited advantages over single layer mos2 in many aspects for nanoelectronic applications. We explored the relative stability, optimal sliding path between different stacking orders of bilayer mos2, and （especially） the effect of inter-layer stress, by combining first-principles density functional total energy calculations and the climbing-image nudge-elastic-band （CI-NEB） method. Among five typical stacking orders, which can be categorized into two kinds （I： AA＇, AB and II： AA＇, AB＇, A＇B）, we found that stacking orders with Mo and S superposing from both layers, such as AA＇ and AB, is more stable than the others. With smaller computational efforts than potential energy profile searching, we can study the effect of inter-layer stress on the stacking stability. Under isobaric condition, the sliding barrier increases by a few eV/（uc.GPa） from AA＇ to ABt, compared to 0.1 eV/（uc.GPa） from AB to [AB]. Moreover, we found that interlayer compressive stress can help enhance the transport properties of AA＇. This study can help understand why inter-layer stress by dielectric gating materials can be an effective means to improving mos2 on nanoelectronic applications.

关键词： mos2 stacking order climbing-image nudge-elastic band isobaric sliding