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Roll-to-roll gravure printing ultra-flexible sustained-photoconductivity carbon nanotube photoelectronic synaptic transistors for bio-inspired visual perception and self-recovery simulation

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Nano Research 2025年第5期18卷

作者： Xueyi Zhang Nianzi Sui Min Li Suyun Wang Shuangshuang Shao Wanrong Liu Jia Sun Junliang Yang Jianwen Zhao 1Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics Central South University Changsha 410083 China 2Key Laboratory of Semiconductor Display Materials and Chips Division of Nanodevices and Related Nanomaterials Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences No. 398 Ruoshui Road Suzhou Industrial Park Suzhou 215123 China 3School of Nano Science and Technology University of Science and Technology of China No. 166 Ren Ai Road Suzhou Industrial Park Suzhou 215123 China

The development of large-area high-performance flexible photoelectronic synaptic devices has become a hot topic in the field of neuromorphic computing and artificial vision systems. In this work, we have successfully prepared a large-area, ultra-flexible semiconducting single-walled carbon nanotubes (sc-SWCNTs) photoelectronic synaptic thin-film transistors (TFTs) array (33 × 34) using solution-processable AlO x thin film as the dielectrics by roll-to-roll gravure printing. Our photoelectronic synaptic TFTs exhibit excellent electrical properties with high switching ratio (≥ 10 5 ), low subthreshold swing (73 mV·dec −1 ), excellent photoresponse properties over a wide wavelength range (from 270 to 650 nm), sustained photoconductivity effect (only 26.7% drop after removing light source for 36,000 s) and remarkable mechanical reliability and flexibility (maintaining excellent electrical properties after bending more than 15,000 cycles with a bending radius of 5 mm). In addition, concepts such as multimodal optoelectronic synaptic plasticity, optical writing speed perception simulation, and human eye self-recovery model have been successfully demonstrated using printed flexible sc-SWCNTs photoelectronic neuromorphic TFTs arrays. More importantly, we systematically investigated the response characteristics of these devices under deep ultraviolet light stimulation and, for the first time, successfully simulated bio-inspired visual perception self-recovery including the dynamic transition of the visual system from clarity to blurriness and their self-recovery over time. This work indicates that our photoelectronic neuromorphic TFT devices have great practical potential in human–computer interaction, environment perception, and visual simulation.

关键词： roll-to-roll gravure printing single-walled carbon nanotubes photoelectronic synaptic transistors ultra-flexibility sustained photoconductivity

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Investigation of Doping C60 with Metal Oxide

Investigation of Doping C60 with Metal Oxide

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第八届全国暨华人有机分子和聚合物发光与光电特性学术会议

作者： Yongli Gao Institute for Super Microstructure and Ultrafast Process in Advanced Materials (ISMUP) Central South University Changsha Hunan the Peoples Republic of China 410083 Department of Physics and Astronomy University of Rochester Rochester NY 14627 USA

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Polarization-Sensitive Enhancement of Photoluminescence and Interlayer Absorption in WSe₂/InSe Heterostructure via Plasmonic Metastructure

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Small 2025年 e2411761页

作者： Zhang, Chao Wu, Kai Wu, Luyan Cao, Guoyang Liu, Xiaoyi Zhang, Cheng Wu, Shaolong Yuan, Xiaoming Zhang, Linglong Li, Xiaofeng Yang, Jiong School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou 215006 China Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics Central South University Hunan Changsha 410083 China College of Physics Nanjing University of Aeronautics and Astronautics Key Laboratory of Aerospace Information Materials and Physics (NUAA) MIIT Nanjing 211106 China Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 China

2D van der Waals heterostructures (vdWH) serve as ideal platforms for studying interlayer excitons (IX) and developing excitonic devices. Typically, IX exhibit in-plane isotropy and weak oscillator strengths, limiting their application in high-performance and polarization-sensitive optoelectronics. In this work, through the coupling of plasmonic resonances to multilayer WSe₂/InSe vdWH, both anisotropy and enhancement of IX emissions are achieved thanks to the specifically designed metastructure, which couples plasmonic resonance modes with the excitation field in the visible and aligns with the excitonic emission in the near-infrared (NIR). By harnessing the significantly enhanced electromagnetic field generated by the anisotropic plasmonic resonance, a remarkable 52-fold increase is achieved in IX emission intensity, accompanied by an anisotropic ratio of 23%. Furthermore, by utilizing the polarization-sensitive and enhanced interlayer absorption, a NIR WSe₂/InSe photodetector is fabricated on the metastructure, achieving a linear polarization ratio of 5.2 along with an optimal photoresponsivity of 1.85 mA W⁻¹ at 1120 nm, one order of magnitude higher than the pristine WSe₂/InSe photodetector. This work provides a universal approach for introducing anisotropy into IX, while simultaneously enhancing the IX emission and interlayer absorption in 2D vdWH. © 2025 Wiley-VCH GmbH.

关键词： interlayer absorption interlayer exciton metastructure photodetection van der waals heterostructure

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Hierarchical TiO2 nanorods with a highly active surface for photocatalytic CO_(2) reduction

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Journal of Central South University 2019年第6期26卷 1503-1509页

作者： CAO Mao-qi LIU Kang ZHOU Hui-min LI Hong-mei GAO Xiao-hui QIU Xiao-qing LIU Min Institute of Super-Microstructure and Ultrafast Process in Advanced Materials School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Chemistry and Chemical Engineering Qiannan Normal University for NationalitiesDuyun 558000China School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Photocatalytic carbon dioxide reduction reaction(CO_(2)RR)has been considered as one of most effective ways to solve the current energy crisis and environmental ***,the practical application of photocatalytic CO_(2)RR is largely hindered by lock of efficient ***,hierarchical titanium dioxide(TiO_(2))nanostructures with a highly active{001}surface were successfully synthesized by a facile approach from metal Ti *** obtained hierarchical TiO_(2)nanostructures were composed of TiO_(2)nanorods,which have a diameter about 5–10 nm and a length of several *** is found that these nanorods have exposed{001}*** the other hand,these hierarchical TiO_(2)nanostructures have a good light-harvesting efficiency with the help of TiO_(2)nanorods component and large specific surface ***,these hierarchical TiO_(2)nanostructures exhibit a much better activity for photocatalytic CO_(2)reduction than that of commercial TiO_(2)(P25).This high activity can be attributed to the synergistic effects of active surface,efficient charge transfer along nanorods and good light harvesting in the nanorod-hierarchical nanostructures.

关键词： TiO_(2) {001}facets hierarchical nanorods CO_(2)photoreduction

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Low-overpotential selective reduction of CO2 to ethanol on electrodeposited CuxAuy nanowire arrays

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Journal of Energy Chemistry 2019年第10期28卷 176-182页

作者： Weiwei Zhu Kuangmin Zhao Suqin Liu Min Liu Feng Peng Pengda An Binhao Qin Huimin Zhou Hongmei Li Zhen He College of Chemistry and Chemical Engineering and Hunan Provincial Key Laboratory of Chemical Power Sources Central South UniversityChangsha 410083HunanChina Institute of Super-microstructure and Ultrafast Process in Advanced Materials State Key Laboratory of Powder MetallurgySchool of Physics and ElectronicsCentral South UniversityChangsha 410083HunanChina School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006GuangdongChina

Direct electrochemical reduction of CO2 to multicarbon products is highly desirable, yet challenging. Here, we present a potentiostatic pulse-electrodeposition of high-aspect-ratio CuxAuy nanowire arrays (NWAs) as high-performance electrocatalysts for the CO2 reduction reaction (CO2RR). The surface electronic structure related to the Cu:Au ratio in the CuxAuy NWAs could be facilely modulated by controlling the electrodeposition potential and the as-fabricated CuxAuy NWAs could be directly used as the catalytic electrode for the CO2RR. The morphology of the high-aspect-ratio nanowire array significantly lowers the onset potential of the alcohol formation due to the diffusion-induced enhancement of the local pH and CO concentration near the nanowire surface. Besides, the properly adjusted surface electronic structure of the CuxAuy NWA enables the adsorption of CO and facilitates the subsequent CO reduction to ethanol via the C-C coupling pathway. Owing to the synergistic effect of morphology and electronic structure, the optimized CuxAuy NWA selectively reduces CO2 to ethanol at low potentials of -0.5——0.7 V vs. RHE with a highest Faradaic efficiency of 48%. This work demonstrates the feasibility to optimize the activity and selectivity of the Cu-based electrocatalysts toward multicarbon alcohols for the CO2RR via simultaneous adjustment of the electronic structure and morphology of the catalysts.

关键词： CO2 reduction Electrocatalysis Nanowire array Selectivity Cu-based catalyst

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Quantized charge-pumping in higher-order topological insulators

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Physical Review B 2022年第16期106卷 165401-165401页

作者： Bing-Lan Wu Ai-Min Guo Zhi-Qiang Zhang Hua Jiang Gusu Laboratory of Materials Suzhou 215123 China Institute for Advanced Study Soochow University Suzhou 215006 China Hunan Key Laboratory for Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083 China School of Physical Science and Technology Soochow University Suzhou 215006 China

We study the quantized charge pumping of higher-order topological insulators (HOTIs) with edge-corner correspondences based on the combination of the rotation of in-plane magnetic field and the quantum spin Hall effect. The picture of a specific charge pumping process is uncovered with the help of the nonequilibrium Green's function method. Significantly, we demonstrate that the quantized charge pumping current is achieved without the participation of bulk states, and the charges move along the boundary of the sample. Furthermore, the effects of external parameters on the pumping current is also studied. We find that the magnitude and direction of the pumping current can be manipulated by adjusting the coupling strength between the leads and sample. Our paper deepens the understanding of the charge pumping in HOTIs and extends the study of their transport properties.

关键词： Geometric & topological phases Quantum transport Topological insulators Transport phenomena

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Effect of layered-coupling in twisted WSe_(2) moiré superlattices

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Nano Research 2023年第2期16卷 3435-3442页

作者： Biao Wu Haihong Zheng Shaofei Li Chang-Tian Wang Junnan Ding Jun He Zongwen Liu Jian-Tao Wang Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Recently,the discovery of a variety of moiré-related properties in the twisted vertical stacking of two different monolayers has attracted considerable *** introduction of small twist angles in transition metal dichalcogenide(TMD)heterostructures leads to the emergence of moirépotentials,which provide a fascinating platform for the study of strong interactions of *** there has been extensive research on moiréexcitons in twisted bilayer superlattices,the capture and study of moiréexcitons in homostructure superlattices with layer-coupling effects remain ***,we present the observation of moiréexcitons in the twisted 1L-WSe_(2)/1L-WSe_(2)and 1L-WSe_(2)/2L-WSe_(2)homostructures with various layer-coupling *** results reveal that the moirépotential increases(~260%)as the number of underlying layers decreases,indicating the effect of layer coupling on the modulation of the moiré*** effects of the temperature and laser power dependence as well as valley polarization on moiréexcitons were further demonstrated,and the crucial spectral features observed were *** findings pave the way for exploring quantum phenomena and related applications of quantum information.

关键词： twisted homostructures moirésuperlattices moirépotential layer-coupling

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Nanowrinkled Carbon Aerogels Embedded with FeN_(x) Sites as Effective Oxygen Electrodes for Rechargeable Zinc-Air Battery

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Research 2019年第1期2019卷 1-13页

作者： Ting He Bingzhang Lu Yang Chen Yong Wang Yaqiang Zhang John L.Davenport Alan P.Chen Chih-Wen Pao Min Liu Zhifang Sun Alexander Stram Alexander Mordaunt Jairo Velasco Jr Yuan Ping Yi Zhang Shaowei Chen State Key Laboratory for Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Department of Chemistry and Biochemistry University of California1156 High StreetSanta CruzCalifornia 95064USA Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaCanada T6G 1H9 Department of Physics University of California1156 High StreetSanta CruzCalifornia 95064USA X-Ray Absorption Group National Synchrotron Radiation Research CenterHsinchu 30076Taiwan Institute of Super-Microstructure and Ultrafast Process in Advanced Materials School of Physics and ElectronicsCentral South UniversityChangsha 410083China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002China

Rational design of single-metal atom sites in carbon substrates by a flexible strategy is highly desired for the preparation of high-performance catalysts for metal-air *** this study,biomass hydrogel reactors are utilized as structural templates to prepare carbon aerogels embedded with single iron atoms by controlled *** tortuous and interlaced hydrogel chains lead to the formation of abundant nanowrinkles in the porous carbon aerogels,and single iron atoms are dispersed and stabilized within the defective carbon skeletons.X-ray absorption spectroscopy measurements indicate that the iron centers are mostly involved in the coordination structure of FeN_(4),with a minor fraction(ca.1/5)in the form of FeN_(3)***-principles calculations show that the FeN_(x) sites in the Stone-Wales configurations induced by the nanowrinkles of the hierarchically porous carbon aerogels show a much lower free energy than the normal *** resulting iron and nitrogen-codoped carbon aerogels exhibit excellent and reversible oxygen electrocatalytic activity,and can be used as bifunctional cathode catalysts in rechargeable Zn-air batteries,with a performance even better than that based on commercial Pt/C and RuO_(2) *** from this study highlight the significance of structural distortions of the metal sites in carbon matrices in the design and engineering of highly active single-atom catalysts.

关键词： Oxygen charge skeleton

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ultrafast growth of high-quality large-sized GaSe crystals by liquid metal promoter

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Nano Research 2022年第5期15卷 4677-4681页

作者： Zuxin Chen Quan Chen Zebing Chai Bin Wei Jun Wang Yanping Liu Yumeng Shi Zhongchang Wang Jingbo Li Institute of semiconductors South China Normal UniversityGuangzhou 510631China School of Materials Sun Yat-Sen UniversityGuangzhou 510275China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430000China School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China International Iberian Nanotechnology Laboratory(INL) 4715–330 BragaPortugal

Growth of high-quality large-sized crystals using the traditional chemical vapor transport(CVT)or vertical Bridgman(VB)technique is costly and time-consuming,limiting its practical industrial ***,we propose an ultrafast crystal growth process with low energy consumption and capability of producing crystals of excellent quality,and demonstrate that large-sized GaSe crystals with a lateral size of 0.5 to 1 cm can be obtained within a short period of 5 min.X-ray diffraction(XRD)and scanning transmission electron microscopy(STEM)studies clearly indicate that the as-grown crystals have a good *** further show the potential application of the resulting GaSe crystals,we fabricate the few-layer GaSe-based photodetector,which exhibits low dark current of 21 pA and fast response of 34 ms under 405 nm *** proposed technique for rapid crystal growth could be further extended to other metallenes with low-melting point,such as Bi-,Sn-,In-,Pb-based crystals,opening up a new avenue in fulfilling diverse potential optoelectronics applications of two-dimensional(2D)crystals.

关键词： GaSe ultrafast growth photodetector liquid metal

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Enhanced valley polarization in WSe_(2)/YIG heterostructures via interfacial magnetic exchange effect

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Nano Research 2023年第7期16卷 10580-10586页

作者： Haihong Zheng Biao Wu Chang-Tian Wang Shaofei Li Jun He Zongwen Liu Jian-Tao Wang Guoqiang Yu Ji-An Duan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518057China

Exploiting the valley degrees of freedom as information carriers provides new opportunities for the development of *** transition metal dichalcogenides(TMDs)with broken space-inversion symmetry exhibit emerging valley pseudospins,making them ideal platforms for studying valley ***,intervalley scattering of different energy valleys limits the achievable degree of valley ***,we constructed WSe_(2)/yttrium iron garnet(YIG)heterostructures and demonstrated that the interfacial magnetic exchange effect on the YIG magnetic substrate can enhance valley polarization by up to 63%,significantly higher than that of a monolayer WSe_(2)on SiO_(2)/Si(11%).Additionally,multiple sharp exciton peaks appear in the WSe_(2)/YIG heterostructures due to the strong magnetic proximity effect at the magnetic-substrate interface that enhances exciton emission ***,under the effect of external magnetic field,the magnetic direction of the magnetic substrate enhances valley polarization,further demonstrating that the magnetic proximity effect regulates valley *** results provide a new way to regulate valley polarization and demonstrate the promising application of magnetic heterojunctions in magneto-optoelectronics.

关键词： magnetic exchange effect valley polarization two-dimensional valleytronics magnetic substrate

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