共查询到19条相似文献,搜索用时 93 毫秒
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以磷钨酸(PWA)为基质,加入适量的P2O5,制备(H3PW12O40-H2O-H3PO4(PWAP)电解质,并研究了相对湿度对电解质电导率的影响。结果表明:PWAP电解质,室温电导率达到0.045S/cm;相对湿度在20~80范围内,电解质的电导率变化不大;在40℃下长时间放置,电解质的质量损失小于2,表明其常温保水性好。将电解质应用于氢气传感器中,利用混合压膜的方法制作传感催化电极和对电极,研制了室温全固态电解质氢气传感器。传感器的组成为:空气,Pt/C|PWAP|Pt/C,H2(在N2中),考察了传感器的电位响应值与氢气体积分数之间的关系,以及相对湿度对氢气传感性能的影响。 相似文献
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一种自组装型SnO_2纳米线氢传感器 总被引:1,自引:0,他引:1
为了能够对低体积分数的氢气进行灵敏探测,提高氢气生产、使用、运输、存储的安全性,通过热蒸发SnO2和活性炭的混合粉末的自组装方式直接在Cr-Au梳状交叉电极上制备了一层SnO2纳米线气敏层,构成了SnO2纳米线气体传感器。经测试,发现此传感器对于体积分数范围为10×10-6~500×10-6的氢气具有良好的探测灵敏度。 相似文献
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化学反应相变电位式传感器是基于还原性物质使电极表面金属离子被还原而沉积,导致电极的开路电位发生突变的原理而工作的.本文描述了以8051单片机为核心的数据采集接口电路并介绍了其在多路化学反应相变电位式传感器系统中的应用. 相似文献
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研究了特殊形貌NiO对基于该类敏感电极的混合电位C3 H6传感器的影响,实验数据显示:线型结构NiO敏感电极传感器在600℃下具有最好的响应值,达到了60 mV,其90%的响应和恢复分别为15,25 s。此传感器在600℃对0%~0.05% C3 H6具有较好敏感性能,且响应信号与气体体积分数对数之间有良好的线性关系,其灵敏度达-50.26 mV/decade。经气相催化分析,在400~600℃和0.01% C3 H6下,线型形貌NiO电极的平均气相催化效率最低,为31.4%(其余两种分别为42.7%,52.4%),进而表现最优的传感器性能。 相似文献
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Eui-Bok LeeAuthor VitaeIn-Sung HwangAuthor Vitae Jung-Ho ChaAuthor VitaeHo-Jun LeeAuthor Vitae Won-Bae LeeAuthor VitaeJames Jungho PakAuthor Vitae Jong-Heun LeeAuthor VitaeByeong-Kwon JuAuthor Vitae 《Sensors and actuators. B, Chemical》2011,153(2):392-397
An integrated catalytic combustion H2 sensor has been fabricated by using MEMS technology. Both the sensing elements and the reference elements could be integrated into the suspended micro heaters connected in a suitable circuit such as a Wheatstone configuration with low power consumption. Two sensitive elements and two reference sensors were integrated together onto a single chip. The size of chip was 5.76 mm2 and the catalytic combustion sensor showed high response to H2 at operating voltage of 1 V. The response and recovery times to 1000 ppm H2 were 0.36 s and 1.29 s, respectively. 相似文献
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The electrical characteristics of Pd/LB film/n-Si tunnel diode hydrogen sensors containing one and three cadmium stearate Langmuir-Blodgett (LB) films are reported. The devices exhibit good rectification behaviour. However, the IV characteristics are complex and deviate considerably from ideal Schottky-barrier theory. The semiconductor surface appears to be inverted at zero bias. Saturation of the forward current is attributed to tunnel-limited transport in the case of single LB film devices and to insulator-limited conduction in the case of devices containing three LB films. Exposure to hydrogen causes pronounced degradation of the diode behaviour. In particular, the forward IV characteristics shows an IV2 behaviour that cannot be satisfactorily explained. A plausible explanation, however, is offered for much of the observed data based upon a minority-carrier metal-insulator-semiconductor (MIS) tunnel diode model. However, the full range of behaviour observed cannot be treated adequately by any one theoretical model. 相似文献
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《计算机与应用化学》2015,(8)
氢键是分子内或分子间的一种弱相互作用,在众多科学分支上起着重要作用,广泛用于分子设计和结构控制,是目前人们研究的热门领域之一。本文详细介绍了氢键的定义、氢键研究的理论方法、氢键对红外光谱的影响以及氢键的协同效应和超加和性,并对氢键研究的现状及前景进行了评述。 相似文献
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The hydrogen atom is comprised of a proton and an electron possessing charges and masses. The latter involves a gravitational interaction. Since hydrogen atoms are the most abundant in the Universe, their gravitational radiation proves to be of importance for cosmology. 相似文献