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Artificial visual perception neural system using a solution-processable MoS_(2)-based in-memory light sensor

Light(Science & Applications) 2023年第8期12卷 1583-1594页

作者： Dayanand Kumar Lana Joharji Hanrui Li Ayman Rezk Ammar Nayfeh Nazek El-Atab Smart Advanced Memory Devices and Applications(SAMA)LaboratoryElectrical and Computer Engineering ProgramComputer Electrical Mathematical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955Kingdom of Saudi Arabia Department of Electrical Engineering and Computer Science Khalifa UniversityAbu Dhabi 127788United Arab Emirates

Optoelectronic devices are advantageous in in-memory light sensing for visual information processing,recognition,and storage in an energy-efficient ***,in-memory light sensors have been proposed to improve the energy,area,and time efficiencies of neuromorphic computing *** study is primarily focused on the development of a single sensing-storage-processing node based on a two-terminal solution-processable MoS2 metal-oxide-semiconductor(MOS)charge-trapping memory structure—the basic structure for charge-coupled devices(CCD)—and showing its suitability for in-memory light sensing and artificial visual *** memory window of the device increased from 2.8 V to more than 6V when the device was irradiated with optical lights of different wavelengths during the program ***,the charge retention capability of the device at a high temperature(100 ℃)was enhanced from 36 to 64%when exposed to a light wavelength of 400 *** larger shift in the threshold voltage with an increasing operating voltage confirmed that more charges were trapped at the Al_(2)O_(3)/MoS_(2) interface and in the MoS_(2) layer.A small convolutional neural network was proposed to measure the optical sensing and electrical programming abilities of the *** array simulation received optical images transmitted using a blue light wavelength and performed inference computation to process and recognize the images with 91%*** study is a significant step toward the development of optoelectronic MOS memory devices for neuromorphic visual perception,adaptive parallel processing networks for in-memory light sensing,and smart CCD cameras with artificial visual perception capabilities.

关键词： visual neural process

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Revolutionizing Thermal Stability and Self‑Healing in Pressure Sensors:A Novel Approach

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advanced Fiber Materials 2023年第6期5卷 2028-2039页

作者： Su Bin Choi Jagan Singh Meena Jong‑Woong Kim Department of Smart Fab Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea Research Center for Advanced Materials Technology Core Research InstituteSungkyunkwan UniversitySuwon 16419Republic of Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Soft electronics,which require mechanical elasticity,rely on elastic materials that have both a small Young’s modulus and a large elastic strain *** materials,however,are prone to damage when stress accumulates,presenting a significant challenge for soft *** address this issue,the integration of self-healing functionality into these materials appears to be a promising *** covalent bond chemistry has been utilized to design high-strength polymers with controllable ***,the temperature needed to trigger self-healing may induce thermal damage to other parts of the *** contrast,if the self-healing temperature is reduced,the device might suffer damage when exposed to temperatures exceeding the self-healing point due to the low stability of the polymer at high *** challenges highlight the need for materials that can self-heal at low temperatures while maintaining thermal stability at high *** response to this challenge,we propose a novel approach that involves forming a microfibrous network using polycaprolactone(PCL),a material with a low melting temperature of 60°C that is widely utilized in shape memory and self-healing *** fabricated the conductive fiber by encapsulating a microfiber PCL network with MXene *** MXene nanosheets were seamlessly coated on the PCL fiber’s surface to prevent shape deformation at high ***,they exhibited high thermal conductivity,facilitating rapid internal heat ***,the MXene/PCL microfiber networks demonstrated self-healing capabilities at 60°C and thermal stability above 200°*** makes them potentially suitable for stretchable,self-healing electronic devices that need to withstand high temperatures.

关键词： Fibers MXene Self-healing Pressure sensor Thermal stability Electrospinning

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In situ synthesis of porous Pt-Pd bimetallic structures for sweat glucose biosensing using dynamic hydrogen bubble template method

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Rare Metals 2024年第7期43卷 3408-3414页

作者： Yi-Wen Guo Qian-Hui Wei Fei Wei Hao Liu Hong-Bin Zhao Dong Wang Hai-Ling Tu State Key Laboratory of Advanced Materials for Smart Sensing China GRINM Group Co.Ltd.Beijing 100088China Department of Advanced Electronic Materials GRIMAT Engineering Institute Co.Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China GRINM(Guangdong)Institute for Advanced Materials and Technology Foshan 528000China School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China

For the practical application of sweat glucose biosensors,it is crucial to develop a method for modifying the working electrode with noble metals that ensures strong *** this study,we synthesized porous Pt-Pd bimetall... 详细信息

关键词： method bubble porous

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Granular Ionogel Particle Inks for 3D Printed Tough and Stretchable Ionotronics

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Research 2024年第1期2023卷 429-442页

作者： Yuan Yao Yue Hui Zhenhua Wang Hehao Chen Heng Zhu Nanjia Zhou Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024Zhejiang ProvinceChina School of Chemical Engineering and Advanced Materials the University of AdelaideAdelaide 5005South AustraliaAustralia State Key Laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceCenter for X-MechanicsDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

Ionogels have garnered great attention as promising soft conducting materials for the fabrication of flexible energy storage devices,soft actuators,and ***,the leakage of the ionic liquids,weak mechanical strength,and poor manufacturability have greatly limited their reliability and ***,we propose a new ionogel synthesis strategy by utilizing granular zwitterionic microparticles to stabilize ionic *** ionic liquids swell the microparticles and physically crosslink microparticles via either electronic interaction or hydrogen *** introducing a photocurable acrylic monomer enables the fabrication of double-network(DN)ionogels with high stretchability(>600%)and ultrahigh toughness(fracture energy>10 kJ/m^(2)).The synthesized ionogels exhibit a wide working temperature of−60 to 90℃.By tuning the crosslinking density of microparticles and physical crosslinking strength of ionogels,we synthesize DN ionogel inks and print them into three-dimensional(3D)*** ionogelbased ionotronics are 3D printed as demonstrations,including strain gauges,humidity sensors,and ionic skins made of capacitive touch sensor *** covalently linking ionogels with silicone elastomers,we integrate the ionogel sensors onto pneumatic soft actuators and demonstrate their capacities in sensing large *** our last demonstration,multimaterial direct ink writing is harnessed to fabricate highly stretchable and durable alternating-current electroluminescent devices with arbitrary *** printable granular ionogel ink represents a versatile platform for the future manufacturing of ionotronics.

关键词： crosslinking utilizing gauge

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Stretchable polymer composites with ultrahigh piezoelectric performance

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National Science Review 2023年第8期10卷 203-210页

作者： Tongxiang Tang Zhonghui Shen Jian Wang Shiqi Xu Jiaxi Jiang Jiahui Chang Mengfan Guo Youjun Fan Yao Xiao Zhihao Dong Houbing Huang Xiaoyan Li Yihui Zhang Danyang Wang Long-Qing Chen Ke Wang Shujun Zhang Ce-Wen Nan Yang Shen State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Center for Flexible Electronics Technology Tsinghua University School of Materials Science and Engineering University of New South Wales Department of Materials Science and Engineering The Pennsylvania State University State College Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of Wollongong

Flexible piezoelectric materials capable of withstanding large deformation play key roles in flexible electronics. Ferroelectric ceramics with a high piezoelectric coefficient are inherently brittle, whereas polar polymers exhibit a low piezoelectric coefficient. Here we report a highly stretchable/compressible piezoelectric composite composed of ferroelectric ceramic skeleton, elastomer matrix and relaxor ferroelectric-based hybrid at the ceramic/matrix interface as dielectric transition layers, exhibiting a giant piezoelectric coefficient of 250 picometers per volt, high electromechanical coupling factor keff of 65%,ultralow acoustic impedance of 3MRyl and high cyclic stability under 50% compression strain. The superior flexibility and piezoelectric properties are attributed to the electric polarization and mechanical load transfer paths formed by the ceramic skeleton, and dielectric mismatch mitigation between ceramic fillers and elastomer matrix by the dielectric transition layer. The synergistic fusion of ultrahigh piezoelectric properties and superior flexibility in these polymer composites is expected to drive emerging applications in flexible smart electronics.

关键词： polymer composites piezoelectric materials structure design flexible electronics

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Long-wave infrared emission properties of strain-balanced InAs/In_(x)Ga_(1-x)As_(y)Sb_(1-y)type-Ⅱsuperlattice on different substrates

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Rare Metals 2024年第7期43卷 3194-3204页

作者： Chao Shi Xuan Fang Hong-Bin Zhao Deng-Kui Wang Xi Chen Dan Fang Dong-Bo Wang Xiao-Hua Wang Jin-Hua Li State Key Laboratory of High Power Semiconductor Lasers School of PhysicsChangchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Advanced Materials for Smart Sensing China General Research Institute for Nonferrous MetalsBeijing 100088China Department of Opto-Electronic Information Science School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

High-performance type-Ⅱsuperlattices ofⅢ-Ⅴsemiconductor materials play an important role in the development and application of infrared optoelectronic *** the quality of epitaxial materials and clarifying the luminescent mechanism are of great significance for practic al applic *** this work,strain-balanced and high-quality In As/In_(x)Ga_(1-x)As_(y)Sb_(1-y)superlattices without lattice mismatch were achieved on InAs and GaSb substrates *** grown on In As substrate could exhibit higher crystal quality and surface flatness based on high-resolution X-ray diffraction(HRXRD)and atomic force microscopy(AFM)measurements'***,the strain distribution phenomenon from geometric phase analysis indicates that fluctuations of alloy compositions in superlattices on GaSb substrate are more *** addition,the optical properties of superlattices grown on different substrates are discussed *** of the difference in fluctuations of element composition and interface roughness of superlattices on different substrates,the superlattices grown on In As substrate would have higher integral intensity and narrower full-width at half maximum of long-wave infrared ***,the thermal quenching of emission intensity indicates that the superlattices grown on the In As substrate have better recombination ability,which is beneficial for increasing the operating temperature of infrared optoelectronic devices based on this type of superlattices.

关键词： Photoluminescence Alloy compositions fluctuations InAs(Sb)/In_(x)Ga_(1-x)As_(y)Sb_(1-y) Type-Ⅱsuperlattice Substrate

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Bioinspired Zwitterionic Block Polymer-Armored Nitric Oxide-Generating Coating Combats Thrombosis and Biofouling

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Research 2025年第1期2024卷 870-884页

作者： Qing Ma Wentai Zhang Xiaohui Mou Nan Huang Haimang Wang Hongyu Zhang Zhilu Yang School of Materials Science and Engineering Key Lab of Advanced Technology of Materials of Education MinistrySouthwest Jiaotong UniversityChengdu610031China Dongguan Key Laboratory of Smart Biomaterials and Regenerative Medicine The Tenth Affiliated HospitalSouthern Medical UniversityDongguan523059China GuangZhou Nanchuang Mount Everest Company for Medical Science and Technology Guangzhou510670China State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084China Wenzhou Institute University of Chinese Academy of SciencesWenzhou352001 ZhejiangChina

Thrombosis and infection are 2 major complications associated with central venous catheters(CVCs),resulting in substantial mortality and *** concurrent long-term administration of antibiotics and anticoagulants to address these complications have been demonstrated to cause severe side effects such as antibiotic resistance and *** mitigate these complications with minimal or no drug utilization,we developed a bioinspired zwitterionic block polymer-armored nitric oxide(NO)-generating functional coating for surface modification of *** armor was fabricated by precoating with a Cu-dopamine(DA)/selenocysteamine(SeCA)(Cu-DA/SeCA)network film capable of catalytically generating NO on the CVCs surface,followed by grafting of a zwitterionic p(DMA-b-MPC-b-DMA)polymer *** synergistic effects of active attack by NO and copper ions provided by Cu-DA/SeCA network and passive defense by zwitterionic polymer brush imparted the CVCs surface with durable antimicrobial properties and marked inhibition of platelets and *** in vivo studies confirmed that the surface-armored CVCs could effectively reduce inflammation and inhibit thrombosis,indicating a promising potential for clinical applications.

关键词： biofouling central venous catheters thrombosis nitric oxide zwitterionic block polymer central venous catheters cvcs resulting antibiotic resistance bioinspired coating

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Close-Range Human Following Control on a Cane-Type Robot with Multi-Camera Fusion

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IEEE Robotics and Automation Letters 2023年第10期8卷 6443-6450页

作者： Liu, Haowen Wu, Fengxian Zhong, Bin Zhao, Yijun Zhang, Jiatong Niu, Wenxin Zhang, Mingming Shenzhen Key Laboratory of Smart Healthcare Engineering Guangdong Provincial Key Laboratory of Advanced Biomaterials Department of Biomedical Engineering Southern University of Science and Technology Shenzhen518055 China School of Medicine Tongji University Shanghai201619 China Department of Biomedical Engineering Southern University of Science and Technology Shenzhen518055 China Department of Biomedical Engineering National University of Singapore Singapore117583 Singapore School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen518055 China

Cane-Type robots have been utilized to assist the mobility-impaired population. The essential technique for cane-Type robots is to follow the user's ambulation at a close range. This study developed a new cane-Type wheeled robot and proposed a novel human-following control frame with multi-camera fusion. This human following control adopts a cascade control strategy consisting of two parts: 1) a human following position controller that locates a user by detecting his/her legs' positions via multi-camera fusion and 2) a cane robot velocity controller to steer the cane robot to the target position. The proposed strategy's effectiveness has been validated in outdoor experiments with six healthy subjects. The experimental scenarios included different terrains (i.e., straight, turning, and inclined paths), road conditions (i.e., asphalt and brick roads) and walking speeds. The obtained results showed that the average tracking error in the X and Y directions was less than 4.1 and 4.4 cm, respectively, and the error in angle was less than 12.9 across all scenarios. Moreover, the cane robot can effectively adapt to a wide range of individual gait patterns and achieve stable human following at daily walking speeds (0.74 m/s-1.47 m/s). © 2016 IEEE.

关键词： Microcontrollers

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Brain Tumor Automated Detection System Based on Hybrid Deep Learning Networks Using MRI Images

Brain Tumor Automated Detection System Based on Hybrid Deep ...

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2024 International Telecommunications Conference, ITC-Egypt 2024

作者： Salama, Gerges M. Ashraf, Shady Bayoumi, Esraa Salah Elwan, Mohammed Abd-Ellah, Mahmoud Khaled Minia University Faculty of Engineering Department of Electrical Engineering Minia6111 Egypt Egyptian Academy for Engineering and Advanced Technology Electrical Engineering Department Egypt College of Computing and Information Technology Arab Academy for Science Smart Village GizaB 2401 Egypt Egyptian Russian university Faculty of Artificial Intelligence Cairo11829 Egypt

ISBN: (纸本)9798350351408

technology undeniably has a significant impact on human life, particularly in advancing various aspects of healthcare. Artificial intelligence (AI) has greatly contributed to the early and precise detection of tumors, especially in the realm of medical image processing, with a specific focus on brain tumor detection using magnetic resonance imaging (MRI). However, manually analyzing numerous MRI images is a challenging task in clinical settings. Hence, the utilization of a computer-aided diagnostic (CAD) system is imperative for the timely identification of normal and abnormal brain tissues. This study proposes a hybrid detection architecture to determine the presence of brain tumors. The system incorporates five different deep convolutional neural networks (CNNs) for feature extraction, each comprising five models that identify the optimal five layers for feature extraction before employing Support Vector Machine (SVM) for classification. The system undergoes training and evaluation to ascertain the most effective detection outcomes. The study utilizes two datasets to assess the system's performance and functionality. © 2024 IEEE.

关键词： Support vector machines

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Ultrathin BiOCl crystals grown in highly disordered vapor micro-turbulence for deep ultraviolet photodetectors

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Rare Metals 2024年第11期43卷 5921-5931页

作者： Qing Guo Xiu-Jun Wang Lin Wang Xin Ye A-Lei Li Xiao-Hang Pan Yun-Lei Zhong Yong Zhang Li-Xing Kang Key Laboratory of Multifunctional Nanomaterials and Smart Systems Division of Advanced MaterialsSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China

Crystallization,while a common process in nature,remains one of the most mysterious *** its physical mechanisms is essential for obtaining high-quality ***,crystals grown by thermal evaporation or sublimation nucleate the substrate facing the evaporation ***,a novel vapor micro-turbulence mass transport mechanism in the growth process of ultrathin BiOCl single crystals has been *** this mechanism,the precursor vapor bypasses the solid substrate,forming micro-turbulent vaporizing flows to nucleate on the surface of the substrate facing away from the evaporation *** nucleation kinetics,fast shear flows are known to cause secondary nucleation,increasing nucleation quantity while decreasing the final size of the ***,the nucleation and growth process of BiOCl crystals are controlled by adjusting the micro-turbulence intensity to reduce shear flow energy and dilate phase distribution,resulting in BiOCl crystals with uniform distribution and regular *** structural and morphological characterization confirms the high crystallization quality of the obtained crystals,and the performance of the constructed solar-blind photodetectors is comparable to that of similar *** findings contribute to a deeper understanding of vapor mass transport and crystal growth techniques and may be useful for applications related to metal oxide crystals.

关键词： Ultrathin metal oxides crystals Micro-turbulence Microspacing sublimation Ultraviolet photodetectors Crystallization

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