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Atomic origin of the traps in memristive interface

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Nano Research 2017年第6期10卷 1924-1931页

作者： Ye Tian Lida Pan chuan fei guo Qian Liu CAS Center of Excellence for Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology No. 11 Beiyitiao Zhongguancun Beijing 100190 China School of Communication and Electronics Engineering Hunan City University Yiyang 413000 China Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 USA Institute of Physics Chinese Academy of Sciences Beijing 100190 China Photonics Research Group Department of Information Technology Ghent University-IMEC Ghent B-9000 Belgium Department of Materials Science and Engineering South University of Science and Technology of China Shenzhen 518055 China

In recent years, trap-related interfacial transport phenomena have received great attention owing to their potential applications in resistive switching devices and photo detectors. Not long ago, one new type of memristive interface that is composed of F-doped SnO2 and Bi2S3 nano-network layers has demonstrated a bivariate-continuous-tunable resistance with a swift response comparable to the one in neuron synapses and with a brain-like memorizing capability. However, the resistive mechanism is still not clearly understood because of lack of evidence, and the limited improvement in the development of the interfacial device. By combining I-V characterization, electron energy-loss spectroscopy, and first- principle calculation, we studied in detail the macro/micro features of the memristive interface using experimental and theoretical methods, and confirmed that its atomic origin is attributed to the traps induced by O-doping. This implies that impurity-doping might be an effective strategy for improving switching features and building new interfacial memristors.

关键词： memristance interface trap state first principle calculation

High-Porosity Foam-Based Iontronic Pressure Sensor with Superhigh Sensitivity of 9280 kPa^(-1)

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Nano-Micro Letters 2022年第2期14卷 12-23页

作者： Qingxian Liu Yuan Liu Junli Shi Zhiguang Liu Quan Wang chuan fei guo School of Astronautics Harbin Institute of TechnologyHarbin 150001HeilongjiangPeople’s Republic of China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Department of Civil and Environmental Engineering Shantou UniversityShantou 515063GuangdongPeople’s Republic of China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Physics and TcSUH University of HoustonHoustonTX 77204USA Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Present Address:320 Crescent Village Circle Unit 1413 San JoseCA 95134USA

Flexible pressure sensors with high sensitivity are desired in the fields of electronic skins,human-machine interfaces,and health *** ionic soft materials with microstructured architectures in the functional layer is an effective way that can enhance the amplitude of capacitance signal due to generated electron double layer and thus improve the sensitivity of capacitive-type pressure ***,the requirement of specific apparatus and the complex fabrication process to build such microstructures lead to high cost and low ***,we report a simple strategy that uses open-cell polyurethane foams with high porosity as a continuous three-dimensional network skeleton to load with ionic liquid in a one-step soak process,serving as the ionic layer in iontronic pressure *** high porosity(95.4%) of PU-IL composite foam shows a pretty low Young's modulus of 3.4 kPa and good compressibility.A superhigh maximum sensitivity of 9,280 kPa^(-1) in the pressure regime and a high pressure resolution of 0.125% are observed in this foam-based pressure *** device also exhibits remarkable mechanical stability over 5,000 compression-release or bending-release *** high porosity of composite structure provides a simple,cost-effective and scalable way to fabricate super sensitive pressure sensor,which has prominent capability in applications of water wave detection,underwater vibration sensing,and mechanical fault monitoring.

关键词： High porosity Elastic modulus Compression deformation Iontronic pressure sensor Superhigh sensitivity

Metallic nanostructures for light trapping in energy-harvesting devices

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Light(Science & Applications) 2014年第1期3卷 231-242页

作者： chuan fei guo Tianyi Sun Feng Cao Qian Liu Zhifeng Ren Department of Physics and TcSUH University of HoustonHoustonTX 77204USA National Center for Nanoscience and Technology of China Beijing 100190China

Solar energy is abundant and environmentally *** trapping in solar-energy-harvesting devices or structures is of critical *** article reviews light trapping with metallic nanostructures for thin film solar cells and selective solar *** metallic nanostructures can either be used in reducing material thickness and device cost or in improving light absorbance and thereby improving conversion *** metallic nanostructures can contribute to light trapping by scattering and increasing the path length of light,by generating strong electromagnetic field in the active layer,or by multiple reflections/*** have also discussed the adverse effect of metallic nanostructures and how to solve these problems and take full advantage of the light-trapping effect.

关键词： conversion efficiency light trapping photovoltaics plasmonics solar absorber

Intelligent responsive self-assembled micro-nanocapsules: Used to delay gel gelation time

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Petroleum Science 2024年第4期21卷 2433-2443页

作者： chuan-Hong Kang Ji-Xiang guo Dong-Tao fei Wyclif Kiyingi Unconventional Petroleum Research Institute China University of Petroleum

In the application of polymer gels to profile control and water shutoff,the gelation time will directly determine whether the gel can "go further" in the formation,but the most of the methods for delaying gel gelation time are complicated or have low *** is an urgent need for an effective method for delaying gel gelation time with intelligent *** by the slow-release effect of drug capsules,this paper uses the self-assembly effect of gas-phase hydrophobic SiO2in aqueous solution as a capsule to prepare an intelligent responsive self-assembled *** capsule slowly releases the cross-linking agent under the stimulation of external conditions such as temperature and pH value,thus delaying gel gelation *** the pH value is 2 and the concentration of gas-phase hydrophobic SiO2particles is 10%,the gelation time of the capsule gel system at 30,60,90,and 120℃ is12.5,13.2,15.2,and 21.1 times longer than that of the gel system without containing capsule,*** with other methods,the yield stress of the gel without containing capsules was 78 Pa,and the yield stress after the addition of capsules was 322 *** intelligent responsive self-assembled micronanocapsules prepared by gas-phase hydrophobic silica nanoparticles can not only delay the gel gelation time,but also increase the gel *** slow release of cross-linking agent from capsule provides an effective method for prolongating the gelation time of polymer gels.

关键词： Profile control and water shutoff Polymer gel Delayed gelation time Intelligent response Self-assembled Micro-nanocapsules

A stretchable and adhesive ionic conductor based on polyacrylic acid and deep eutectic solvents

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npj Flexible Electronics 2021年第1期5卷 175-182页

作者： Gang Li Zhihao Deng Minkun Cai Kaixi Huang Mengxue guo Ping Zhang Xingyu Hou Yuan Zhang Yueji Wang Yan Wang Xiang Wu chuan fei guo Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhenChina Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhenChina School of Materials Science and Engineering Shenyang University of TechnologyShenyangLiaoningChina Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhenGuangdongChina

Hydrogels are a widely used ionic conductor in on-skin electronic and iontronic ***,hydrogels dehydrate in the open air and freeze at low temperatures,limiting their real applications when they are attached on skin or exposed to low ***-ionic liquid gels can overcome these two obstacles,but synthetic ionic liquids are expensive and *** this work,we present an ionic conductor based on polyacrylic acid(PAAc)and deep eutectic solvents(DESs)that well addresses the aforementioned *** polymerize acrylic acid in DESs to get the PAAc–DES gel,which exhibits excellent stretchability(>1000%),high electrical conductivity(1.26 mS cm^(−1)),high adhesion to the skin(~100 Nm^(−1)),as well as good anti-drying and anti-freezing *** also demonstrate that the PAAc-DES gel can be used as an on-skin electrode to record the surface electromyographic signal with high signal quality,or as a transparent stretchable electrode in iontronic devices that can work at–20℃.We believe that the PAAc–DES gels are an ideal candidate as epidermal electrodes or transparent stretchable electrodes.

关键词： properties ionic conductor

Sugar transfer of nanomaterials and flexible electrodes

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International Journal of Smart and Nano Materials 2020年第1期11卷 1-10页

作者： Tianzeng Hong Tianze Shen Junlong Yang Yichen Sun Jianming Zhang Haiyang Pan Ying Hong Yan Wang Shuo Chen Yue Zhao chuan fei guo Department of Materials Science&Engineering Southern University of Science&TechnologyShenzhenGuangdongChina Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science&TechnologyShenzhenGuangdongChina Department of Physics and TcSUH University of HoustonHoustonTXUSA

Nanomaterials with various dimensionalities(e.g.,nanowires,nanofilms,two-dimensional materials,and three-dimensional nanostructures)have shown great potential in the recent development of flexible ***,organic solvents are inevitable while integrating nanomaterials onto flexible substrates,where polymer mediator-assisted transfer techniques are *** often damages the flexible substrate and thus hamper the large-scale application of *** we report a method using watersoluble sugar as a mediator to facilely transfer nanomaterials onto rigid or flexible *** method requires no organic solvent during *** importantly,the morphology and properties of transferred nanomaterials,such as shape,microstructure,resistivity,and transmittance are well preserved on the target *** believe that this universal and rapid transfer method can greatly advance the applications of nanomaterials in the field of flexible devices and beyond.

关键词： Sugar transfer graphene flexible electrode nanomaterials

Integration of Soft Electronics and Biotissues

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The Innovation 2021年第1期2卷 100-101页

作者： chuan fei guo Liming Ding Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

The collection of physiological signals as well as the electrical stimulation to the biotissues are significant but *** is a huge gap between the living systems and *** are wet and soft,while electronics are dry and relatively stiff;biotissues conduct ions,while electronic materials often conduct *** a result,forming a stable interface for bidirectional electrical communications between electronics and the living systems is *** this perspective,we review recent landmark progresses made in this field,and propose a few future directions that scientists may further work on.

关键词： Integration directions electronics

Silver nanowires for anti-counterfeiting

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Journal of Materiomics 2020年第1期6卷 152-157页

作者： Yan Wang Ningning Bai Junlong Yang Zhiguang Liu Gang Li Minkun Cai Lingyu Zhao Yuan Zhang Jianming Zhang Chunhua Li Yunlong Zhou chuan fei guo School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Department of Materials Science&Engineering Centers for Mechanical Engineering Research and Education at MIT and SUSTechSouthern University of Science and TechnologyShenzhen518055China c Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province Wenzhou Institute of Biomaterials and EngineeringUniversity of Chinese Academy of SciencesWenzhou325000China

Silver nanowire(AgNW)films have been widely used as flexible transparent electrodes due to the high electrical conductance and high transmittance in the visible *** infrared(IR)properties of AgNW films,however,are seldom ***,we show that ultrathin AgNWs present high transmittance in the visible range(~95%)and high reflectance(60-70%)in the IR range of 8e14 *** a significant difference makes AgNW films invisible to naked eyes but visible under an IR camera,being an ideal selection for anti-counterfeit technologies,while no excitation is *** have demonstrated that AgNW films can be spray-coated on either flat or microstructured surfaces with high conformability and high scratch-resistance,and thus these anti-counterfeiting materials can be applied to a variety of *** AgNW-based anti-counterfeiting may be helpful for combating counterfeiting crimes in the fields of medicines,artwork,banknotes,brand luxuries,industrial parts,and so on.

关键词： Silver nanowires Anti-counterfeiting Infrared light Excitation-free Conformability

Impacts of pancreatic exocrine insufficiency on gut microbiota

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第4期25卷 271-279页

作者： Yulin guo Feng CAO fei LI Department of General Surgery Xuanwu Hospital of Capital Medical UniversityBeijing 100053China Acute Pancreatitis Clinical Center of Capital Medical University Beijing 100053China

Pancreatic exocrine insufficiency(PEI)can be induced by various kinds of diseases,including chronic pancreatitis,acute pancreatitis,and *** main pathogenetic mechanism of PEI involves the decline of trypsin synthesis,disorder of pancreatic fluid flow,and imbalance of secretion *** studies have shown that PEI could induce gut bacterial overgrowth and dysbiosis,with the abundance of Lactobacillus and Bifidobacterium increasing the most,which could be partially reversed by pancreatic enzyme replacement *** studies have also confirmed the association between PEI and the dysbiosis of gut *** exocrine secretions and changes in duodenal p H as well as bile salt malabsorption brought about by PEI may affect and shape the abundance and composition of gut *** turn,the gut microbiota may impact the pancreatic exocrine acinus through potential bidirectional *** forward,more and higher-quality studies are needed that focus on the mechanism underlying the impact of PEI on the gut microbiota.

关键词： Pancreatic exocrine insufficiency Gut microbiota Gut microbiome Pancreatic enzyme replacement therapy