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Grain Boundary Effects on the Mobility of Chemical Vapor Deposition Synthesized Monolayer MoS_(2)-FETs

Chinese Journal of Structural Chemistry 2021年第4期40卷 512-518,408页

作者： JU Qian-Kun HONG Wen-Ting LIU Wei CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

Molybdenum disulphide (MoS_(2)) has emerged as a promising candidate for low-power digital ***,grain boundaries play a decisive role in determining the carrier mobility and performance of MoS_(2)-*** this work,we report a systematic study on the grain boundary of chemical vapor deposition (CVD)MoS_(2).We found that in the ON-state,if current flows across a grain boundary that is aligned perpendicular to the channel length,the current of CVD MoS_(2)-FETs can be significantly reduced,while in the OFF-state,the effect is ***-insulator-transition is clearly observed,indicating the high quality of our CVD samples,and it is also shown that grain boundaries increase the metal-insulator-transition crossover-voltage in MoS_(2)-***,this work provides useful information and guidance in understanding the nature of carrier transport in synthesized MoS2 devices,and the developed framework can be applied to other 2D semiconductors in general,as well as in optimizing the CVD process and device design with 2D materials.

关键词： grain boundary golybdenum disulfide ghemical vapor deposition field-effect transistor

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Electrocatalytic volcano relations:surface occupation effects and rational kinetic models

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Chinese Journal of Catalysis 2022年第1期43卷 2-10页

作者： Yongting Chen Junxiang Chen Shengli Chen Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072HubeiChina CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002China

Electrocatalysis plays a vital role in technologies of energy and environment relevance,such as water electrolysis,fuel cells,synthesis of carbon and nitrogen-based fuels,*** volcano relations(VRs)are general and standard tools for predicting and understanding the activity trends of *** modern electrocatalytic VRs are generally based on the kinetic models with the maximum free energy(△G^(0)_(max))of reaction steps as the rate-determining term(RDT),in which some important factors that crucially impact the reaction kinetics are missed,for examples,the surface structures and coverages of reaction intermediates and spectators,other free energy demanding steps than that associated with the △G^(0)_(max),and so *** this perspective,we first give a brief introduction of the theoretical framework of current electrocatalytic VRs and the underlying problems in the oversimplifiedDG0max-based kinetic models,and then provide an account of our effort in constructing more rational VRs for electrocatalytic *** introduce a new theoretical framework of electrocatalytic VRs based on kinetic model with the so-called energetic span(δE)serving as *** the surface-coverage effects and multiple free energy-demanding steps are considered,the VRs thus obtained show several new features such as strong potential dependence,asymmetric ascending and descending branches,relatively flat tops,and so *** effectiveness of theδE-based VRs is verified for hydrogen and oxygen electrocatalytic ***,research directions to further rationalize the electrocatalytic VRs are discussed.

关键词： Electrocatalysis Volcano relations Energetic span Hydrogen electrocatalytic reaction Oxygen electrocatalytic reaction

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The Size-Dependent Thermal Enhancement of Down-Shifting Luminescence Based on Non-Yb3+-Mediated Energy Migration

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SSRN 2024年

作者： Chen, Rui Xu, Jie Xu, Ju Lin, Hang Cheng, Yao Wang, Yuansheng Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences Fuzhou3500002 China Fujian College University of Chinese Academy of Sciences Fuzhou350002 China

The past few years have witnessed extensive attention to the size-dependent up-conversion luminescence thermal enhancement of Ln3+ doped nanoparticles, where the involvement of Yb3+ ions seem to be essential. In this work, a size-dependent down-shifting luminescence thermal enhancement behavior of NaGdF4:Ce3+/Tb3+ has been reported. Specifically, it is the first time to realize the size-dependent luminescence thermal enhancement with a non-Yb3+-involved luminescence process. We demonstrate that the size-dependent luminescence behavior is ascribed to the establishment of energy migration channels via Gd3+ sublattice. These findings offer a feasible way to design the luminescence thermal behavior of nanophosphors with a broader range in terms of both chemical composition and luminescence mechanism. © 2024, The Authors. All rights reserved.

关键词： Luminescence

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cPCN-Regulated SnO_(2) Composites Enables Perovskite Solar Cell with Efficiency Beyond 23%

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Nano-Micro Letters 2021年第7期13卷 12-27页

作者： Zicheng Li Yifeng Gao Zhihao Zhang Qiu Xiong Longhui Deng Xiaochun Li Qin Zhou Yuanxing Fang Peng Gao CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianPeople’s Republic of China College of Chemistry Fuzhou UniversityFuzhou 350116People’s Republic of China Laboratory for Advanced Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021People’s Republic of China

Efficient electron transport layers(ETLs)not only play a crucial role in promoting carrier separation and electron extraction in perovskite solar cells(PSCs)but also significantly affect the process of nucleation and growth of the perovskite ***,crystalline polymeric carbon nitrides(cPCN)are introduced to regulate the electronic properties of SnO_(2) nanocrystals,resulting in cPCN-composited SnO_(2)(SnO_(2)-cPCN)ETLs with enhanced charge transport and perovs-kite layers with decreased grain ***,SnO_(2)-cPCN ETLs show three times higher electron mobility than pristine SnO_(2) while offering better energy level alignment with the perovskite *** SnO_(2)-cPCN ETLs with decreased wettability endow the perovskite films with higher crystallinity by retarding the crystallization *** the end,the power conversion efficiency(PCE)of planar PSCs can be boosted to 23.17%with negligible hysteresis and a steady-state efficiency output of 21.98%,which is one of the highest PCEs for PSCs with modified SnO_(2) ***_(2)-cPCN based devices also showed higher stability than pristine SnO_(2),maintaining 88%of the initial PCE after 2000 h of storage in the ambient environment(with controlled RH of 30%±5%)without encapsulation.

关键词： Electron transport layer Perovskite solar cell Carbon nitride SnO_(2)

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High-capacity potassium ion storage mechanisms in a soft carbon revealed by solid-state NMR spectroscopy

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Rare Metals 2022年第11期41卷 3752-3761页

作者： Jing-Heng Han Jia He Qi-Yao Zou Jie Zhang Zhi Yang Zhi-Wei Zhao Hui-Xin Chen Hong-Jun Yue Da-Wei Wang Hai-Chen Lin Hao-Dong Liu Gui-Ming Zhong Zhang-Quan Peng College of Chemistry and Material Science Fujian Normal UniversityFuzhou350000China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare-Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen361021China Laboratory of Advanced Spectro-Electrochemistry and Li-Ion Batteries Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Jilin UniversityChangchun130025China Chemical Engineering University of California San DiegoLa JollaSan DiegoCA92093USA

Carbon materials are crucially important for the realization of potassium-ion ***,the potassium storage mechanisms in various carbon materials are incompletely ***,solid-state ^(13)C nuclear magnetic resonance(NMR) spectroscopy coupled with Raman and X-ray diffraction(XRD) techniques are employed to study the reaction mechanism in a soft carbon *** is revealed that the insertion of potassium ions into the soft carbon firstly induces a transformation of the disordered region to short-range ordered stacking,involving both the pristine local unorganized and organized carbon ***,potassium ions intercalate into the rearranged carbon structure,finally producing the nano-sized KC_(8).Moreover,a remarkable c apacity of 322 mAh·g^(-1) with a low mid potassiation voltage of <0.3 V is present for the prepared soft carbon,which is on account of the underlying potassium storage sites,including the disordered stacking carbon as a main component of the soft *** results suggest that regulating the disordered stacking region in the turbostratic structure of soft carbon is a critical issue for further improving the potassium storage performance.

关键词： Reaction mechanism Soft carbon Solid-state nuclear magnetic resonance(NMR) Anode Potassium-ion batteries(PIBs)

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Conversion of Methane to Ethylene with BaCe_(0.9)Y_(0.1)Co_(x)O_(3-δ)Hydrogen Permeation Membrane

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Chinese Journal of Structural Chemistry 2021年第7期40卷 901-907,839页

作者： LIU Yun YUAN Sheng-Ze XIE Kui College of Chemistry Fuzhou UniversityFuzhou 350116China Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China

Dehydrogenation coupling of methane(DCM),which can be effectively used to produce low carbon alkenes,has the advantages of rich raw materials,simple reaction device,low energy consumption,***,we report a series of Co doped perovskite porous-dense BaCe_(0.9)Y_(0.1)Co_(x)O_(3-δ)(BCYCx)membrane for *** treatment in a reduced atmosphere,a large number of Co nanoparticles will exsolute on the surface of *** metal-oxide interface is helpful to activate the C–H bonds,inhibit the carbon deposition,and so *** XRD,SEM and XPS prove that Co nanoparticles homogeneously distributed on the BCYCx porous layers,which will create a large quantity of catalytic active *** 1100℃,the highest concentration of C_(2)product was 5.66%(5.25%ethane+0.41%ethylene)in output gas when methane conversion reaches a maximum value of 24.8%,and the C_(2)selectivity gets to 45.6%.We further demonstrate the catalytic performance of high-temperature DCM without obvious decrease after running for 30 hours.

关键词： mixed-conducting dehydrogenation methane metal nanoparticle membrane

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Strong support effect induced by MXene for the synthesis of metal sulfides nanosheet arrays with sulfur vacancies towards selective CO_(2)-to-CO photoreduction

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Science Bulletin 2024年第20期69卷 3247-3259页

作者： Guanshun Xie Le Liao Jie Wang Peng Zhang Benhua Xu Xiuqiang Xie Chi Chen Babak Anasori Nan Zhang College of Materials Science and Engineering Hunan UniversityChangsha 410082China Qinghai Provincial Key Laboratory of New Light Alloys Qinghai UniversityXining 810016China Chemical Engineering College Qinghai UniversityXining 810016China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China School of Materials Engineering School of Mechanical EngineeringPurdue UniversityWest Lafayette 47907USA

Selective CO_(2)-to-CO photoreduction is under intensive research and requires photocatalysts with tuned microstructures to accelerate the reaction ***,we report CuInS_(2)nanosheet arrays with sulfur vacancies(VS)grown on the two-dimensional(2D)support of Ti_(3)C_(2)T_(x)MXene for CO_(2)-to-CO *** results reveal that the use of Ti_(3)C_(2)T_(x)induces strong support effect,which causes the hierarchical nanosheet arrays growth of CuInS_(2)and simultaneously leads to charge transfer from CuInS_(2)to Ti_(3)C_(2)T_(x)support,resulting in VSformed in CuInS_(2).The strong support effect based on Ti_(3)C_(2)T_(x)is proven to be applicable to prepare a series of different metal indium sulfide arrays with ***_(2)nanosheet arrays with VSsupported on Ti_(3)C_(2)T_(x)benefit the photocatalytic selective reduction of CO_(2)to CO,manifesting a remarkable over 14.8-fold activity enhancement compared with pure CuInS_(2).The experimental and computational investigations pinpoint that VSof CuInS_(2)resulting from the support effect of Ti_(3)C_(2)T_(x)lowers the barrier of the rate-limiting step of^(*)COOH→^(*)OH+^(*)CO,which is the key to the photoactivity *** work demonstrates MXene support effects and offers an effective approach to regulate the atomic microstructure of metal sulfides toward enhancing photocatalytic performance.

关键词： Metal sulfides Sulfur vacancies Nanosheet arrays Support effect Selective photocatalytic CO_(2)-to-CO reduction

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Enhancing Cycle and Rate Performance of Micron-Si/Siox Anodes Through the Construction of Dense Cnt Coatings and High-Strength Conductive Polymer Network

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SSRN 2024年

作者： Jia, Yifan Feng, Xiao Liu, Xuwei Wu, Qirui Chen, Yujia Wu, Chuxin Guan, Lunhui State Key Laboratory of Structural Chemistry Fujian Key Laboratory of Nanomaterials CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350108 China College of Chemistry Fuzhou University Fujian Fuzhou350108 China

The interfacial instability and poor rate performance caused by the drastic volume expansion hinder the further application of micron-silicon (μSi) anode. To this end, this work designs a conductive polymer network (PAA-TA-CMC/CNT) that balances the dense coating effect of carbon nanotubes and high strength. In this conductive polymer network, carboxymethyl cellulose (CMC) and carboxylated multi-walled carbon nanotubes (CNT) form a dense conductive network through self-assembly, achieving uniform coating of CNT on μSi particles. The polymeric binder formulated from polyacrylic acid (PAA) and tannic acid (TA) leverages a range of interactions, including covalent bonds and hydrogen bonds, to not only ensure the robust attachment of the conductive coating onto μSi but also significantly bolster the overall strength of the electrode. As anticipated, the μSi anode, facilitated by the conductive polymer network, retains a substantial reversible capacity of 1885.4 mAh/g after undergoing 300 cycles (2 A/g) and demonstrated excellent stability even after 350 cycles at a high rate of 4 A/g. Furthermore, this conductive polymer network can also enhance the rate capability and long-cycle life of SiOx anodes (1426.3 mAh/g over 300 cycles at 2 A/g, 891.6 mAh/g over 1000 cycles at 4 A/g). This design strategy, which incorporates both dense CNT coating and high-strength conductive polymers, offers a viable approach to improving the performance of high-capacity alloy-based anode materials. © 2024, The Authors. All rights reserved.

关键词： Multiwalled carbon nanotubes (MWCN)

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Synthesis of NaYF_(4):20% Yb^(3+),2% Er^(3+),2% Ce^(3+)@NaYF_(4) nanorods and their size dependent uptake efficiency under flow condition

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Journal of Rare Earths 2022年第10期40卷 1519-1526页

作者： Dongmei Qiu Jie Hu Peiyuan Wang Decai Huang Yaling Lin Haina Tian Xiaodong Yi Qilin Zou Haomiao Zhu Fujian Normal University Fuzhou350007China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen361021China College of Materials Science and Engineering Huaqiao UniversityXiamen 361021China Research Center of Biomedical Engineering of Xiamen&Key Laboratory of Biomedical Engineering of Fujian Province&Fujian Provincial Key Laboratory for Soft Functional Materials Research Department of BiomaterialsCollege of MaterialsXiamen UniversityXiamen 361005China Centre D’Elaboration de Mat eriaux et D’Etudes Structurales(CEMES) CNRSUniversit e de Toulouse-UPS29 Rue Jeanne MarvigBP 9434731055ToulouseCedex 4France

Lanthanide doped fluorescent nanoparticles have gained considerable attention in biomedical ***,the low uptake efficiency of nanoparticles by cells has limited their *** this work,we demonstrate how the uptake efficiency is affected by the size of nanoparticles under flow *** the same size NaYF_(4):20%Yb^(3+),2%Er^(3+),2%Ce^(3+)(the contents of rare earths elements are in molar fraction)nanoparticles as core,NaYF_(4):20%Yb^(3+),2%Er^(3+),2%Ce^(3+)@NaYF_(4) core-shell structured nanorods(NRs)with different sizes of 60-224 nm were synthesized by thermal decomposition and hot injection *** excitation at 980 nm,a strong upconversion green emission(541 nm,^(2)H_(11/2)→^(4) I_(15/2) of Er^(3+))is observed for all *** emission intensity for each size nanorod was calibrated and is found to depend on the width of *** flow conditions,the nanorods with 96 nm show a maximum uptake efficiency by endothelial *** work demonstrates the importance of optimizing the size for improving the uptake efficiency of lanthanide-doped nanoparticles.

关键词： Uptake efficiency Endothelial cells Upconversion luminescence Cell imaging Rare earths

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Compact ultrabroadband light-emitting diodes based on lanthanide-doped lead-free double perovskites

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Light(Science & Applications) 2022年第3期11卷 94-106页

作者： Shilin Jin Renfu Li Hai Huang Naizhong Jiang Jidong Lin Shaoxiong Wang Yuanhui Zheng Xueyuan Chen Daqin Chen College of Physics and Energy Fujian Normal UniversityFujian Provincial Key Laboratory of Quantum Manipulation and New Energy MaterialsFuzhou 350117China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information Fuzhou 350116China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials and State Key Laboratory of Structural ChemistryFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage Fuzhou 350117China College of Chemistry Fuzhou UniversityFuzhou 350116China

Impurity doping is an effective approach to tuning the optoelectronic performance of host materials by imparting extrinsic electronic ***,a family of lanthanide(Ln^(3+))ions was successfully incorporated into a Bi:Cs_(2)AgInCl_(6) lead-free double-perovskite(DP)semiconductor,expanding the spectral range from visible(Vis)to near-infrared(NIR)and improving the photoluminescence quantum yield(PLQY).After multidoping with Nd,Yb,Er and Tm,Bi/Ln:Cs_(2)AgInCl_(6) yielded an ultrabroadband continuous emission spectrum with a full width at half-maximum of~365 nm originating from intrinsic self-trapped exciton recombination and abundant 4f-4f transitions of the Ln^(3+)***-state and transient-state spectra were used to ascertain the energy transfer and emissive *** avoid adverse energy interactions between the various Ln^(3+)ions in a single DP host,a heterogeneous architecture was designed to spatially confine different Ln^(3+)dopants via a“DP-in-glass composite”(DiG)*** bottom-up strategy endowed the prepared Ln^(3+)-doped DIG with a high PLQY of 40%(nearly three times as high as that of the multidoped DP)and superior long-term ***,a compact Vis-NIR ultrabroadband(400~2000 nm)light source was easily fabricated by coupling the DiG with a commercial UV LED chip,and this light source has promising applications in nondestructive spectroscopic analyses and multifunctional lighting.

关键词： dopant tuning double

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