Stretchable electronic sensing devices are defining the path toward wearable electronics. High-performance flexible strain sensors attached on clothing or human skin are required for potential applications in the ente...Stretchable electronic sensing devices are defining the path toward wearable electronics. High-performance flexible strain sensors attached on clothing or human skin are required for potential applications in the entertainment,health monitoring, and medical care sectors. In this work,conducting copper electrodes were fabricated onpolydimethylsiloxane as sensitive stretchable microsensors by integrating laser direct writing and transfer printing approaches. The copper electrode was reduced from copper salt using laser writing rather than the general approach of printing with pre-synthesized copper or copper oxide nanoparticles. An electrical resistivity of 96 l X cm was achieved on 40-lm-thick Cu electrodes on flexible substrates. The motion sensing functionality successfully demonstrated a high sensitivity and mechanical robustness.This in situ fabrication method leads to a path toward electronic devices on flexible substrates.展开更多
作为热门的电子产品之一,射频识别装置受到市场的追捧,射频电子技术的市场潜力非常巨大,论文将射频识别技术(Radio Frequency Identification Technology)应用在汽车防盗系统中,文中提出的射频识别装置由两部分组成,分别是汽车启动顶部...作为热门的电子产品之一,射频识别装置受到市场的追捧,射频电子技术的市场潜力非常巨大,论文将射频识别技术(Radio Frequency Identification Technology)应用在汽车防盗系统中,文中提出的射频识别装置由两部分组成,分别是汽车启动顶部的应答器和内部的阅读器构成,对整个装置的硬件和软件系统进行设计开发,首先搭建硬件系统的整体框架进行,重点对射频卡读写电路进行设计,包含射频电源和外围元件的选择以及射频电路的设计,软件系统设计方面,重点研究了读卡和写卡软件设计,给出了相应的时序图和程序流程图,达到了射频程序可靠读写的目的;结论表明,射频识别装置避免了市场上使用电池遥控装置,有效地实现了汽车防盗的目的。展开更多
电压调控磁各向异性磁隧道结(voltage controlled magnetic anisotropy magnetic tunnel junction, VCMA-MTJ)作为磁随机存储器(magnetic random access memory, MRAM)的核心器件,具有读写速度快、功耗低、与CMOS工艺相兼容等优点,现已...电压调控磁各向异性磁隧道结(voltage controlled magnetic anisotropy magnetic tunnel junction, VCMA-MTJ)作为磁随机存储器(magnetic random access memory, MRAM)的核心器件,具有读写速度快、功耗低、与CMOS工艺相兼容等优点,现已得到国内外学者的广泛关注.然而随着VCMA-MTJ尺寸不断缩小、MRAM存储容量不断增大,工艺偏差对MTJ性能的影响变得越来越显著,甚至会引起VCMA-MTJ电路的读写错误.本文在充分考虑磁控溅射薄膜生长工艺中自由层厚度偏差(γtf)、氧化势垒层厚度偏差(γtox)以及离子束刻蚀工艺中由侧壁再沉积层引入的刻蚀工艺稳定因子(α)偏差影响的情况下,给出了基于工艺偏差的VCMA-MTJ电学模型,并将该模型应用到VCMA-MTJ读写电路中,研究了工艺偏差对上述电路读写错误率的影响.结果表明:当γtf≥13%, γtox≥11%时, VCMA-MTJ将无法实现磁化状态的有效切换;当α≤0.7时, VCMA-MTJ磁化方向的进动过程变得不稳定.进一步地, VCMA-MTJ电路的读错误率和写错误率也将随着工艺偏差的增大而增大.研究表明,通过增大外加电压(Vb)和减小外加电压脉冲宽度(tpw)可有效降低VCMA-MTJ电路的写错误率,增大电路的读驱动电压(Vdd)可有效降低VCMA-MTJ电路的读错误率.展开更多
基金supported by National Natural Science Foundation of China (51575016)the Beijing Oversea High-Level Talent Project+1 种基金strategic research Grant (KZ20141000500, B-type) of Beijing Natural Science Foundation P.R. Chinathe support by the China Scholarship Council (20160654015) for his research stay at the Institute of Physical and Chemical Research,Wako, Japan
文摘Stretchable electronic sensing devices are defining the path toward wearable electronics. High-performance flexible strain sensors attached on clothing or human skin are required for potential applications in the entertainment,health monitoring, and medical care sectors. In this work,conducting copper electrodes were fabricated onpolydimethylsiloxane as sensitive stretchable microsensors by integrating laser direct writing and transfer printing approaches. The copper electrode was reduced from copper salt using laser writing rather than the general approach of printing with pre-synthesized copper or copper oxide nanoparticles. An electrical resistivity of 96 l X cm was achieved on 40-lm-thick Cu electrodes on flexible substrates. The motion sensing functionality successfully demonstrated a high sensitivity and mechanical robustness.This in situ fabrication method leads to a path toward electronic devices on flexible substrates.
文摘作为热门的电子产品之一,射频识别装置受到市场的追捧,射频电子技术的市场潜力非常巨大,论文将射频识别技术(Radio Frequency Identification Technology)应用在汽车防盗系统中,文中提出的射频识别装置由两部分组成,分别是汽车启动顶部的应答器和内部的阅读器构成,对整个装置的硬件和软件系统进行设计开发,首先搭建硬件系统的整体框架进行,重点对射频卡读写电路进行设计,包含射频电源和外围元件的选择以及射频电路的设计,软件系统设计方面,重点研究了读卡和写卡软件设计,给出了相应的时序图和程序流程图,达到了射频程序可靠读写的目的;结论表明,射频识别装置避免了市场上使用电池遥控装置,有效地实现了汽车防盗的目的。
