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High precision patternable liquid metal based conductor and adhesive substrate enabled stretchable hybrid systems

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Nano Research 2024年第6期17卷 5595-5603页

作者： Runhui Zhou Jiaoya Huang Zemin Li Yushu Wang Ziyu Chen caofeng pan CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004China Institute of Atomic Manufacturing Beihang UniversityBeijing 100191China

Stretchable hybrid systems have been attracting tremendous attention for their essential role in soft robotics,on-skin electronics,and implantable *** rigid and soft functional modules are typically required in those ***,ensuring stable electrical contact between rigid and soft modules is a vital ***,we propose a simple,universal,and scalable strategy for the stretchable hybrid system through a highly precise printable liquid metal particle-based conductor and adhesive fluorine rubber *** properties of liquid metal particle-based conductors could be easily tuned to realize high-precision patterning,large-scale printing,and the ability to print on various ***,the fluorine rubber substrate could form strong interfacial adhesion with various components and materials through simply pressing and heating,hence enabling stable electrical ***,we prepared a stretchable hybrid light-emitting diode(LED)display system and employed it in on-skin visualization of pressure levels,which perfectly combined rigid and soft modules,thus demonstrating the promising potential applications in complex multifunctional stretchable hybrid systems for emerging technologies.

关键词： stretchable hybrid systems liquid metal high precision interfacial adhesion

Artificial visual-tactile perception array for enhanced memory and neuromorphic computations

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InfoMat 2024年第3期6卷 81-94页

作者： Jiaqi He Ruilai Wei Shuaipeng Ge Wenqiang Wu Jianchao Guo Juan Tao Ru Wang Chunfeng Wang caofeng pan CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingthe People's Republic of China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijingthe People's Republic of China Guangdong Research Center for Interfacial Engineering of Functional Materials College of Materials Science and EngineeringShenzhen UniversityShenzhenthe People's Republic of China

The emulation of human multisensory functions to construct artificial perception systems is an intriguing challenge for developing humanoid robotics and cross-modal human–machine *** by human multisensory signal generation and neuroplasticity-based signal processing,here,an artificial perceptual neuro array with visual-tactile sensing,processing,learning,and memory is *** neuromorphic bimodal perception array compactly combines an artificial photoelectric synapse network and an integrated mechanoluminescent layer,endowing individual and synergistic plastic modulation of optical and mechanical information,including short-term memory,long-term memory,paired pulse facilitation,and“learning-experience”***tial or superimposed visual and tactile stimuli inputs can efficiently simulate the associative learning process of“Pavlov's dog”.The fusion of visual and tactile modulation enables enhanced memory of the stimulation image during the learning process.A machine-learning algorithm is coupled with an artificial neural network for pattern recognition,achieving a recognition accuracy of 70%for bimodal training,which is higher than that obtained by unimodal *** addition,the artificial perceptual neuron has a low energy consumption of~20 *** its mechanical compliance and simple architecture,the neuromorphic bimodal perception array has promising applications in largescale cross-modal interactions and high-throughput intelligent perceptions.

关键词： artificial intelligent systems mechanoluminescence neuromorphic computing optoelectronic synapse visual-tactile perception

Advances in high-temperature operatable triboelectric nanogenerator

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SusMat 2024年第3期4卷 1-35页

作者： Ruirui Cao Ying Liu Huilin Li Zhitao Shen Fumin Li Xiaoyong Jia Chong Chen RongLiu Caiqin Luo Wensheng Yang Rongrong Bao caofeng pan Henan Key Laboratory of Photovoltaic Materials School of Future TechnologyHenan UniversityKaifengChina CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina Engineering Research Center for Nanomaterials Henan UniversityKaifengChina Institute of Solid State Physics HFIPSChinese Academy of SciencesHefeiChina

The triboelectric nanogenerator(TENG)offers a novel approach to harness mechanical energy continuously and *** has emerged as a leading technology for converting mechanical energy into *** demand for self-powered wearable microelectronics and energy generation in extreme conditions underscores the need for efficient high-temperature operatable TENGs(HTO-TENGs).However,the operating environment temperature not only affects the storage and dissipation of electrons during triboelectrification,leading to decreased output performance of TENG and instability at high temperatures,but also damage to the mechanical stability and effective defects in most tribomaterials,resulting in a further reduction in TENG’s effective output ***,the unstable material properties of the triboelectric layer at high temperatures also restrict the use of the TENG in harsh ***,it is imperative to consider the structural durability and electrical output stability of TENG when applying it in challenging working *** review aims to bridge this gap by providing a comprehensive overview of the current state and research advancements in HTO-TENG for the first ***,this review presents insights into future research prospects and proposes design strategies to facilitate the rapid development of the field.

关键词： electrical output stability harsh environments high-temperature operatable thermionic emission triboelectric nanogenerator

From Proton Conductive Nanowires to Nanofuel Cells： A Powerful Candidate for Generating Electricity for Self-Powered Nanosystems

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Nano Research 2011年第11期4卷 1099-1109页

作者： caofeng pan Jun Luo Jing Zhu Beijing National Center for Electron Microscopy Laboratory of Advanced Materials State Key Laboratory of New Ceramics and FineProcessing Department of Material Science and Engineering Tsinghua University Beijing 100084 China

The likely goal of nanotectulology is the integration of individual nanodevices into a nanosystem, which includes the nanodevice（s）, power harvesting unit, data processing logic system, and possibly wireless communication unit. A nanosystem requires a nanoscale power source to make the entire package extremely small and high performance. The nanofuel and nanobiofuel cells developed here represent a new self-powering approach in nanotechnology, and their power output is high enough to drive nanodevices for performing self-powered sensing. This study shows the feasibility of building self-powered nanosystems for biological sciences, environmental monitoring, defense technology and even personal electronics.

关键词： Nation nanowire nanofuel cell nanobiofuel cell self-powered nanosystem

Flexible Ag Microparticle/MXene-Based Film for Energy Harvesting

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Nano-Micro Letters 2021年第12期13卷 235-246页

作者： Yunpeng Jia Yamin pan Chunfeng Wang Chuntai Liu Changyu Shen caofeng pan Zhanhu Guo Xianhu Liu College of Materials Science and Engineering Key Laboratory of Advanced Material Processing&Mold(Ministry of Education)National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002People’s Republic of China National Center for Nanoscience and Technology(NCNST) Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083People’s Republic of China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Integrated Composites Laboratory Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

Ultra-thin flexible films have attracted wide attention because of their excellent ductility and potential *** particular,the energy-harvesting films(EHFs)have become a research hotspot because of the indispensability of power source in various ***,the design and fabrication of such films that can capture or transform di erent types of energy from environments for multiple usages remains a ***,the multifunctional flexible EHFs with e ective electro-/photo-thermal abilities are proposed by successive spraying Ag microparticles and MXene suspension between on waterborne polyurethane films,supplemented by a *** optimal coherent film exhibits a high electrical conductivity(1.17×10^(4)S m^(-1)),excellent Joule heating performance(121.3℃)at 2 V,and outstanding photo-thermal performance(66.2℃ within 70 s under 100 mW cm^(-1)).In addition,the EHFs-based single-electrode triboelectric nanogenerators(TENG)give short-circuit transferred charge of 38.9 nC,open circuit voltage of 114.7 V,and short circuit current of 0.82μ*** interestingly,the output voltage of TENG can be further increased via constructing the double triboelectrification *** comprehensive ability for harvesting various energies of the EHFs promises their potential to satisfy the corresponding requirements.

关键词： Energy harvesting MXene Ag microparticle Triboelectric nanogenerator

Oxygen-assisted preparation of mechanoluminescent ZnS：Mn for dynamic pressure mapping

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Nano Research 2018年第4期11卷 1967-1976页

作者： Xiandi Wang Rui Ling Yufei Zhang Miaoling Que Yiyao Peng caofeng pan Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology (NCNST) Beijing 100190 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Aerospace Materials and Performance (Ministry of Education) School of Materials Science and Engineering Beihang University Beijing 100191 China

Mechanoluminescent materials that convert mechanical stimuli to light emission have attracted extensive attention for potential applications in human-machine interactions. Here, we report a simple and available novel approach for the oxygen-assisted preparation of ZnS：Mn particles by solid-state reaction at atmospheric pressure without the formation of the corresponding oxides. The existence of O2 has a positive impact on the formation of S vacancies in wurtzite-phase ZnS, leading to the introduction of Mn2＋ ion luminescent centers and shallow donor levels, which can improve the electron-hole recombination rate. The O2 ratio and Mn2＋ ion doping concentration have significant effects on the luminous efficienc）5 which is optimal at 1%-20% and 1 at.%-2 at.% respectively. In addition, a device based on the piezo-photonic effect with excellent pressure sensitivity of 0.032 MPa-1 was fabricated, which can map the two-dimensional pressure distribution ranging from 2.2 to 40.6 MPa in situ. This device can be applied to real-time pressure mapping, smart sensor networks, high-level security systems, human-machine interfaces, and artificial skins.

关键词： oxygen assistance piezo-photonic effect pressure mapping ZnS:Mn

Piezotronics in two-dimensional materials

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InfoMat 2021年第9期3卷 987-1007页

作者： Qin Zhang Shanling Zuo Ping Chen caofeng pan Center on Nanoenergy Research Guangxi Key Laboratory for Relativistic AstrophysicsSchool of Physical Science and TechnologyGuangxi UniversityNanningChina CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina School of Nanoscience and Technology University of Chinese Academy of SciencesBeijingChina

The fascinating two-dimensional(2D)materials are being potentially applied in various fields from science to engineering benefitting from the charming physical and chemical properties on optics,electronics,and magnetism,compared with the bulk crystal,while piezotronics is a universal and pervasive phenomenon in the materials with broking center symmetry,promoting the new field and notable achievements of piezotronics in 2D materials with higher accuracy and *** example,20 parts per billion of the detecting limitations in NO_(2)sensor,500μm of spatial strain resolution in flexible devices,and 0.363 eV output voltage in *** this review,three categories of 2D piezotronics materials are first introduced ranging from organic to inorganic data,among which six types of 2D inorganic materials are emphasized based on the geometrical arrangement of different ***,the microscopic mechanism of carrier transport and separation in 2D piezotronic materials is highlighted,accompanied with the presentation of four measured ***,the developed applications of 2D piezotronics are discussed comprehensively including different kinds of sensors,piezo-catalysis,nanogenerators and information ***,we suggest the challenges and provide the ideas for qualitative-quantitative research of microscopic mechanism and large-scale integrated applications of 2D piezotronics.

关键词： carrier transport flexible devices piezotronics two-dimensional materials

Piezotronic effect enhanced Schottky-contact ZnO micro/nanowire humidity sensors

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Nano Research 2014年第7期7卷 1083-1091页

作者： Guofeng Hu Ranran Zhou Ruomeng Yu Lin Dong caofeng pan Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332-0245 USA

A ZnO micro/nanowire has been utilized to fabricate Schottky-contacted humidity sensors based on a metal-semiconductor-metal （M-S-M） structure. By means of the piezotronic effect, the signal level, sensitivity and sensing resolution of the humidity sensor were significantly enhanced when applying an external strain. Since a higher Schottky barrier markedly reduces the signal level, while a lower Schottky barrier decreases the sensor sensitivity due to increased ohmic transport, a 0.22% compressive strain was found to optimize the performance of the humidity sensor, with the largest responsivity being 1,240%. The physical mechanism behind the observed mechanical-electrical behavior was carefully studied by using band structure diagrams. This work provides a promising way to significantly enhance the overall performance of a Schottky-contact structured micro/nanowire sensor.

关键词： piezotronic effect humidity sensor ZnO micro/nanowire Schottky contact

Investigating the interlayer electron transport and its in?uence on the whole electric properties of black phosphorus

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Science Bulletin 2019年第4期64卷 254-260页

作者： Bensong Wan Shaoqiang Guo Jiacheng Sun Yufei Zhang Yuyan Wang caofeng pan Junying Zhang Key Laboratory of Micro-nano Measurement Manipulation and Physics (Ministry of Education) School of Physics Beihang University CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences School of Nanoscience and Technology University of Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science and Technology Guangxi University College of Optoelectronic Engineering Shenzhen University

Two-dimensional(2D) nanomaterials have attracted great attention in next generation electronic and optoelectronic technologies due to the unique layered structure and excellent physical and chemical properties. However, the mechanism of transmission along the vertical direction of 2D semiconductor materials has not been investigated. Here, we use first-principles calculations to explore the bandgap energies along different directions, and fabricate a vertical, a lateral and a mixture-structured black phosphorus field effect transistor(BPFET) to study the electrical characteristics along different directions under variable temperatures. The variable temperature test indicates that the mixture-structured device performs more like a lateral device, while the conductance along the vertical direction is hard to be tuned by temperature and electrical field. The unchanged conductance under electric field and variable temperatures allows the vertical device to act as a fixed resistor, promising possible application for the prospective electronic and optoelectronic devices.

关键词： Black phosphorus Transistor Transmission Vertical Variable temperature