共查询到20条相似文献，搜索用时 15 毫秒
1.
Wen-Ai Mo Guanglong Ding Zihao Nie Zihao Feng Kui Zhou Ruo-Si Chen Peng Xie Gang Shang Su-Ting Han Ye Zhou 《Advanced Electronic Materials》2023,9(1):2200733
Neuromorphic system based on artificial synaptic devices is considered as a potential candidate to realize the in-memory computing and parallel processing of data for overcoming the von Neumann bottleneck. However, to fully imitate the complicated functions of the biological neural networks at the hardware level is still a challenging task. In this work, a multi-terminal MoS2 synaptic transistor is developed, which not only simulates various biological synaptic behaviors, including paired pulse facilitation (PPF), excitatory/inhibitory post-synaptic current (EPSC/IPSC), spike-rate-dependent plasticity (SRDP), and spike-timing-dependent plasticity (STDP), but also can independently mimic the parallel signal processing and transmissions in biological multipolar neurons. By combining the multi-terminal MoS2 synaptic transistor with the micro-structured polydimethylsiloxane (PDMS) pressure sensors, an intelligent tactile recognition system is built up, which can realize the spatiotemporal recognition of touch position. Furthermore, with sensor selection, the spatiotemporal modulation of synaptic plasticity and the human learning and forgetting behaviors to the knowledge with different difficulty degrees can be mimicked. This work provides a novel interconnection scheme for simulating signal transmission and processing among neurons, showing broad application prospects of the multi-terminal MoS2 synaptic transistor in intelligent human–computer interaction and bionic neuromorphic perception systems. 相似文献
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《Advanced Electronic Materials》2017,3(4)
Development of highly sensitive pressure sensors that function well even in bending environments and operate at ultralow voltage is desirable for wearable applications. Here, a highly sensitive and bendable capacitive pressure sensor with the ability to distinguish pressure and bending stimuli and a pressure‐sensitive transistor (PST) that can be easily integrated into wearable sensor system due to ultralow voltage (as low as 1 V for stable signal detection) operation is demonstrated. By introducing surface treatment and bonding technique, all components of the pressure sensor are tightly bonded to each other, enabling high bending stability. The sensor shows high pressure sensitivity (9.9 kPa−1) and can detect pressure even in the bending state. Additional bending sensors enables to separately detect signals from the actual pressure and bending deformation. In order to implement low‐power sensor circuitry, the PST is fabricated by integrating the pressure sensor and inkjet‐printing single‐walled carbon nanotube thin film transistor. Such low‐voltage operation of the PST enables to demonstrate the stand‐alone wearable user‐interactive pulse monitoring system by using commercially available electronic devices. The strategy for bendable low‐power sensor may enable realization of wearable sensing system and electronic skins with low power consumption in near future. 相似文献
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Wei Su Zhiguang Wang Yicheng Chen Xinger Zhao Chaojie Hu Tao Wen Zhongqiang Hu Jingen Wu Ziyao Zhou Ming Liu 《Advanced Electronic Materials》2020,6(3)
Measurement of magnetic signal from an arbitrary direction is of vital importance for applications in magnetic navigation, space science, indoor positioning, and magnetic gesture recognition. However, magnetoresistive sensors, as vector magnetometers, are only suitable for detection of magnetic signals along the magnetic hard axis. Magnetoelectric coupling is introduced to control the magnetic anisotropy of a magnetoresistive pattern, realizing a 90° rotation of the magnetic hard axis and thus the sensing direction of the tunable sensor. The sensitivity along the initial magnetic easy axis can be enhanced 12.7‐fold while that along the initial hard axis can be depressed to be only 4.7% of the original value through magnetic anisotropy engineering. The tailorable directional sensitivity of the electric‐field reconfigurable sensor speaks to the strong potential of this system for practical applications requiring testing of localized magnetic fields, for example, magnetic diagnosis or biomagnetic characterization. 相似文献
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Artificial electronic skin consists of mechanically flexible and stretchable sensor networks that can accommodate irregular surfaces and spatially map/quantify various stimuli, such as strains, pressures, and temperatures to imitate the human somatosensory system. Here, a flexible/wearable multifunctional sensor array is designed and fabricated in a cost‐effective manner through simple fabrication procedures for highly‐sensitive contact/pressure/strain detections. Composed of PET‐based Ag serpentine‐shaped electrodes, the sensor array is implemented for static and dynamic mapping of spatial contact/pressure/strain distributions in large‐scale, with a detection limit of 6 Pa (corresponding to 0.5 mg). By attaching the flexible/wearable devices on human body, different motions are recognized/distinguished for gesture control applications. Combining the easy‐fabricated and low‐cost features, these sensor arrays may become promising candidate for highly‐sensitive force detections, gesture controls, imaging of spatial pressure distributions, and find potential applications in advanced robotics, human‐machine interfaces, next‐generation prosthetics and healthcare monitoring devices. 相似文献
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Samuel Littlejohn Alain Nogaret Giles M. Prentice G. Dan Pantos 《Advanced functional materials》2013,23(43):5398-5402
A flexible yet electronically active composite that mimics mechanoreceptor neurons in the human skin is synthesized, generating voltage oscillations whose frequency increases with pressure. By encoding pressure into frequency, the sensor achieves a high pressure sensitivity (<10 Pa). The ability to sense pressure and to amplify signals arises from the robust negative differential resistance of functionalized graphitic flakes in silicone. 相似文献
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Jianwen Chen Yutian Zhu Xiaohua Chang Duo Pan Gang Song Zhanhu Guo Nithesh Naik 《Advanced functional materials》2021,31(42):2104686
Inspired by the human skin, electronic skins (e-skins) composed of various flexible sensors, such as strain sensor, pressure sensor, shear force sensor, temperature sensor, and humility sensor, and delicate circuits, are emerged to mimic the sensing functions of human skins. In this review, the strategies to realize the versatile functionalities of natural skin-like e-skins, including strain-, pressure-, shear force-, temperature- and humility-sensing abilities, as well as self-healing ability and other functions are summarized. Some representative examples of high-performance e-skins and their applications are outlined and discussed. Finally, the outlook of the future of e-skins is presented. 相似文献
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液晶面板PI层电荷累积和释放过程分析 总被引：1，自引：1，他引：0
液晶显示器的聚酰亚胺配向层(Polyimide,PI)电荷累积过程属于凝聚态物理的电介质理论范畴,由于电介质物理理论还不够完整,造成液晶显示器PI层电荷累积和释放过程机理不甚清晰。文章应用麦克斯韦方程组分析液晶PI层表面电荷累积过程,应用可将快慢效应分开的时域谱学理论分析慢电荷的释放过程,得出液晶面板PI层和液晶层接触面电荷累积与两者的介电常数和电导率的关系,以及累积慢电荷的释放时间常数与PI层厚度的关系。 相似文献
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Jeng-Hun Lee Eunyoung Kim Heng Zhang Haomin Chen Harun Venkatesan Kit-Ying Chan Jie Yang Xi Shen Jinglei Yang Seokwoo Jeon Jang-Kyo Kim 《Advanced functional materials》2022,32(1):2107570
A rational approach is proposed to design soft multifunctional sensors capable of detection and discrimination of different physical stimuli. Herein, a flexible multifunctional sensor concurrently detecting and distinguishing minute temperature and pressure stimuli in real time is developed using electrospun carbon nanofiber (CNF) films as the sole sensing material and electrical resistance as the only output signal. The stimuli sensitivity and discriminability are coordinated by tailoring the atomic- and device-level structures of CNF films to deliver outstanding pressure and temperature sensitivities of ? 0.96 kPa?1 and ? 2.44% ° C?1, respectively, enabling mutually exclusive sensing performance without signal cross-interference. The CNF multifunctional sensor is considered the first of its kind to accomplish the stimulus discriminability using only the electrical resistance as the output signal, which is most convenient to monitor and process for device applications. As such, it has distinct advantages over other reported sensors in its simple, cost-effective fabrication and readout system. It also possesses other invaluable traits, including good bending stability, fast response time, and long-term durability. Importantly, the ability to simultaneously detect and decouple temperature and pressure stimuli is demonstrated through novel applications as a skin-mountable device and a flexible game controller. 相似文献
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Lizhi Sheng Yuan Liang Lili Jiang Qian Wang Tong Wei Liangti Qu Zhuangjun Fan 《Advanced functional materials》2015,25(41):6545-6551
Recently, macroporous graphene monoliths (MGMs), with ultralow density and good electrical conductivity, have been considered as excellent pressure sensors due to their excellent elasticity with a rapid rate of recovery. However, MGMs can only exhibit good sensitivity when the strain is higher than 20%, which is undesirable for touch‐type pressure sensors, such as artificial skin. Here, an innovative method for the fabrication of freestanding flexible graphene film with bubbles decorated on honeycomb‐like network is demonstrated. Due to the switching effect depended on “point‐to‐point” and “point‐to‐face” contact modes, the graphene pressure sensor has an ultrahigh sensitivity of 161.6 kPa?1 at a strain less than 4%, several hundred times higher than most previously reported pressure sensors. Moreover, the graphene pressure sensor can monitor human motions such as finger bending and pulse with a very low operating voltage of 10 mV, which is sufficiently low to allow for powering by energy‐harvesting devices, such as triboelectric generators. Therefore, the high sensitivity, low operating voltage, long cycling life, and large‐scale fabrication of the pressure sensors make it a promising candidate for manufacturing low‐cost artificial skin. 相似文献
11.
Gang Ge Yizhou Zhang Jinjun Shao Wenjun Wang Weili Si Wei Huang Xiaochen Dong 《Advanced functional materials》2018,28(32)
In this study, a binary networked conductive hydrogel is prepared using acrylamide and polyvinyl alcohol. Based on the obtained hydrogel, an ultrastretchable pressure sensor with biocompatibility and transparency is fabricated cost effectively. The hydrogel exhibits impressive stretchability (>500%) and superior transparency (>90%). Furthermore, the self‐patterned microarchitecture on the hydrogel surface is beneficial to achieve high sensitivity (0.05 kPa?1 for 0–3.27 kPa). The hydrogel‐based pressure sensor can precisely monitor dynamic pressures (3.33, 5.02, and 6.67 kPa) with frequency‐dependent behavior. It also shows fast response (150 ms), durable stability (500 dynamic cycles), and negligible current variation (6%). Moreover, the sensor can instantly detect both tiny (phonation, airflowing, and saliva swallowing) and robust (finger and limb motions) physiological activities. This work presents insights into preparing multifunctional hydrogels for mechanosensory electronics. 相似文献
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Yang Yue Nishuang Liu Tuoyi Su Yongfa Cheng Weijie Liu Dandan Lei Feng Cheng Binghui Ge Yihua Gao 《Advanced functional materials》2023,33(13):2211613
The transfer functions of the widely used pressure sensors do not exhibit the desired linearity, which limits their practicability in many fields, such as the Internet of Things and artificial intelligence. Herein, MXene/cellulose nanofiber composite membrane-based linear nanofluidic pressure sensors are demonstrated. The nanoscale gaps between MXene laminates restrict the movement of electrolyte and realize the selective transport of ions, based on which mechanical signals can be converted into electric energy for self-powering. In particular, the generated voltage and current are directly proportional to the applied pressure. The introduction of high-strength cellulose nanofibers not only expands the detection range of the sensor but also achieves continuous adjustment of the nano-gap between MXene laminates, which optimizes the sensitivity of the device. The feasibility of further optimization through the modulation of surface functional groups, electrolyte concentration, and device assembly method is proposed. This 2D nanofluid pressure sensor provides an important approach to manufacture portable and wearable electronic devices for applications in many fields. 相似文献
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Xing Yin Di Liu Linglin Zhou Xinyuan Li Guoqiang Xu Lu Liu Shaoxin Li Chuguo Zhang Jie Wang Zhong Lin Wang 《Advanced functional materials》2020,30(34)
Motion vector sensors play an important role in artificial intelligence and internet of things. Here, a triboelectric vector sensor (TVS) based on a direct‐current triboelectric nanogenerator is reported, for self‐powered measuring various motion parameters, including displacement, velocity, acceleration, angular, and angular velocity. Based on the working mechanism of the contact‐electrification effect and electrostatic breakdown, a continuous DC signal can be collected to directly monitor moving objects free from environmental electromagnetic signal interference existing in conventional self‐powered TVSs with an alternative‐current signal output, which not only enhances the sensitivity of sensors, but also provides a simple solution to miniaturize the sensors. Its sensitivity is demonstrated to be equivalent to state‐of‐the‐art photoelectric technology by a comparative experiment in an intelligent mouse. Notably, an intelligent pen based on the miniaturized TVS is designed to realize motion trajectory tracing, mapping, and writing on the curved surface. This work provides a new paradigm shift to design motion vector sensors and self‐powered sensors in artificial intelligent and internet of things. 相似文献
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XIE Sheng-dong WU Meng Communication Information Engineering Institute Nanjing University of Posts Telecommunications Nanjing China 《中国邮电高校学报(英文版)》2007,14(1):22-25
The integration of cellular network (CN) and wireless local area network (WLAN) is the trend of the next generation mobile communication systems, and nodes will handoff between the two kinds of networks. The received signal strength (RSS) is the dominant factor considered when handoff occurs. In order to improve the handoff efficiency, this study proposes an adaptive decision algorithm for vertical handoff on the basis of fast Fourier transform (FFT). The algorithm makes handoff decision after analyzing the signal strength fluctuation which is caused by slow fading through FFT. Simulations show that the algorithm reduces the number of handoff by 35%, shortens the areas influenced by slow fading, and enables the nodes to make full use of WLAN in communication compared with traditional algorithms. 相似文献
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Ningqi Luo Wenxuan Dai Chenglin Li Zhiqiang Zhou Liyuan Lu Carmen C. Y. Poon Shih‐Chi Chen Yuanting Zhang Ni Zhao 《Advanced functional materials》2016,26(8):1178-1187
Noninvasive and real‐time cuffless blood pressure (BP) measurement realizes the idea of unobtrusive and continuous BP monitoring which is essential for diagnosis and prevention of cardiovascular diseases associated with hypertension. In this paper, a wearable sensor patch system that integrates flexible piezoresistive sensor (FPS) and epidermal electrocardiogram (ECG) sensors for cuffless BP measurement is presented. By developing parametric models on the FPS sensing mechanism and optimizing operational conditions, a highly stable epidermal pulse monitoring method is established and beat‐to‐beat BP measurement from the ECG and epidermal pulse signals is demonstrated. In particular, this study highlights the compromise between sensor sensitivity and signal stability. As compared with the current optical‐based cuffless BP measurement devices, the sensing patch requires much lower power consumption (3 nW) and is capable of detecting subtle physiological signal variations, e.g., pre and postexercises, thus providing a promising solution for low‐power, real‐time, and home‐based BP monitoring. 相似文献
20.
Li Ding Lei Pei Shouhu Xuan Xiwen Fan Xufeng Cao Yu Wang Xinglong Gong 《Advanced Electronic Materials》2020,6(1)
An ultrasensitive multifunctional sensor which integrates tactile sensing and magnetism sensing together in one device is presented. The sensor, dubbed L‐MPF, consists of two interlocking hair‐like magnetization‐induced pillar forests, which are self‐formed under a magnetic field and a loading pressure. An L‐MPF endows intelligent electronics with magnetic field reception, which is the sense of bacteria, birds, and whales, rather than human beings. It is found that the L‐MPF precisely detects the magnitude and the loading path of the dynamic load, including pressure, shear, and magnetic field, with fast response, high reversibility, excellent sensitivity, and high stability. The sensitivity coefficient can reach 1965, 1.6, and 240% T−1 under 50–60% compressive strain, 0–3.4° shear strain, and 21–170 mT magnetic field. Additionally, the strain sensitivity coefficient can be set by the external magnetic field, which affords a potential approach to realize different sensing requirements in various circumstances. For a detailed insight into the sensing element's behavior, the magnetic–mechanic–electric coupling response is also described by simplified model simulation and theoretical analysis. Furthermore, a 4 × 4 L‐MPF array exhibits contactless gesture sensing, which provides a new way for next‐generation human–electronics interface devices and artificial electronic skin. 相似文献