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针对神经内海马区谷氨酸化学递质与神经电生理信号的并行双模检测需要, 设计了8通道电化学递质与电生理双模并行检测传感芯片微系统, 系统组件包括:基于SOI(Silicon-on-insulator)工艺衬底制备的微机电系统MEMS(Micro-electro-mechanical system)神经信息检测探针、低噪声颅内神经电小信号放大器、低功耗中速SAR(Successive approximation register)-ADC(Analog/Digital Converter)模/数转换器、精简低能耗OOK(On-Off-Keying)/FSK(Frequency-Shift-Keying)调制射频发射器.本微型神经信息传感芯片系统具有体积小、抗干扰、化学递质与电生理信号并行检测、灵敏性好、线性度高等特点.对电生理裸探针的4个电生理位点表面沉积铂黑, 电极阻抗优化为35.0 kΩ;通过酶固定技术在谷氨酸检测位点上纳米定向修饰酶复膜结构(Pt-mPD-GluOx)以形成具有特异选择性的生物识别点, 实现神经化学递质谷氨酸的检测;在6~35 μmol/L谷氨酸浓度范围内线性度是0.97, 单位面积灵敏度是0.0069 pA/(μmol/L), 电流响应误差<3.0 pA, 表明此探针可以实现特异选择功能.同时, 基于数模混合180 nm的ASIC(Application specific integrated circuit)芯片制造工艺(SmicRF180 nm 1Poly6M)制造的神经电生理传感后端信息调理单芯片, 其内部关键测试指标:微弱小信号低噪系电压放大器(等效输入噪声电压≤0.7 μV rms, 增益>70 dB, 电源/共模抑制比>100 dB等)、SAR-ADC(有效量化位数是12 bits, 功耗1.2 mW, 最大转换速率1 Msps, 信噪比为60.9 dB)、ASK/FSK调制的射频发射器(功放PA 4~5 dBm, 输出功率满足10 m辐射距离).此微型神经信息感知处理芯片集成检测系统, 可为海马区神经通路的研究提供便携、普适性的无线可穿戴设备.  相似文献
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本文采用丝网印刷技术制备了一种基于聚酰亚胺(PI)柔性塑料基片的Ag/AgCI脑电电极,并建立了一套系统评价柔性脑电电极性能的方法.评价方法主要包括扫描电镜(SEM)表征、电极电位/时间响应和稳定性测试、电化学阻抗测试、附着性测试.结果表明,该柔性电极表面为多孔结构,且与基底粘附性好;该电极呈现Ag/AgC1的电化学界面性质,其平衡电位为0.97±0.20 mV,与Ag/AgC1粉末电极接近;且电极电位一致性和稳定性良好,最大极差电位不超过0.7 mV,4h后电位漂移值在10 μV/4min以内;经磨砂导电膏GT5处理后,电极-皮肤阻抗在5 kΩ以内,满足脑电记录要求;相对于人体皮肤的高阻抗值,柔性电极-导电膏(GT20)的界面阻抗仅为166Ω·cm2.该评价方法系统、实用,可为制定相应国家标准提供技术参考.  相似文献
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An approach to harvesting electrical energy from a mechanically excited piezoelectric element has been described. The topic of this paper studies the most important properties of piezoelectric polymer polyvinylidene fluoride (PVDF) in energy harvesting. We have chosen to develop a recovery application within the clothes. By the use of a piezoelectric energy harvester capable to convert the mechanical energy produced by the knee during walking to an electrical energy. This will be achieved by replacing the traditional textile of the kneepad with the one that is made of the technical textile based on acrylic knitted and PVDF as a patch stuck on the textile. Furthermore, PVDF has many unique features, such as excellent mechanical behavior, large strain without structure fatigue, which enables it to act strongly as the load bearing member, and corrosion resistance. The technical textile, functioning as multifunctional wearable human interfaces, is considered today as a useful tool in several energy fields. In this paper, a smart structure based on piezoelectric polymer (PVDF) has been presented, which a power analytical model, based on the frequency, the geometrical parameters and other factors were investigated. Furthermore, the set of numerical results illustrating the harvested power for a given size of the device has been performed and discussed and how this harvested power may be used as a source for a wearable device. Finally, the theory presented in this study can be used for the realization of other optimal designs, for a wearable sensor with low consumption and so on. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献
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It remains challenging to prepare wearable strain and pressure sensors with excellent mechanical properties, ultra‐high flexibility and sensitivity. Electrically conductive graphene platelets (GnPs) with high structural integrity are used in making a composite film fabricated using robust fabrication techniques. The gauge factor for the strain is up to 100 at 0%‐5% strain and 50 at 5%‐30% strain, and the sensitivity to pressure is 2.7×10‐2 kPa‐1 between 0 and 10 kPa and 1.5×10‐4 kPa‐1 between 300 and 1000 kPa. In addition, the flexible sensor demonstrates good repeatability and durability after 1000 cycles of tensile and compression tests. The flexible sensor has fast response ability and a wide operating temperature range, suggesting the excellent response to temperature. The flexible sensor is applied in monitoring several human motions as a wearable device with high accuracy. The ability to detect strain, pressure and temperature of the flexible sensor extends its applications to multifunctional wearable devices.  相似文献
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Rechargeable batteries have been used to power various electric devices and store energy from renewables, but their toxic components (namely, electrode materials, electrolyte, and separator) generally cause serious environment issues when disused. Such toxicity characteristic makes them difficult to power future wearable electronic devices. Now an environmentally friendly and highly safe rechargeable battery, based on a pyrene‐4,5,9,10‐tetraone (PTO) cathode and zinc anode in mild aqueous electrolyte is presented. The PTO‐cathode shows a high specific capacity (336 mAh g?1) for Zn2+ storage with fast kinetics and high reversibility. Thus, the PTO//Zn full cell exhibits a high energy density (186.7 Wh kg?1), supercapacitor‐like power behavior and long‐term lifespan (over 1000 cycles). Moreover, a belt‐shaped PTO//Zn battery with robust mechanical durability and remarkable flexibility is first fabricated to clarify its potential application in wearable electronic devices.  相似文献
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The lithium–air battery has been proposed as the next‐generation energy‐storage device with a much higher energy density compared with the conventional lithium‐ion battery. However, lithium–air batteries currently suffer enormous problems including parasitic reactions, low recyclability in air, degradation, and leakage of liquid electrolyte. Besides, they are designed into a rigid bulk structure that cannot meet the flexible requirement in the modern electronics. Herein, for the first time, a new family of fiber‐shaped lithium–air batteries with high electrochemical performances and flexibility has been developed. The battery exhibited a discharge capacity of 12 470 mAh g?1 and could stably work for 100 cycles in air; its electrochemical performances were well maintained under bending and after bending. It was also wearable and formed flexible power textiles for various electronic devices.  相似文献
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