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首页> 外文期刊>Smart Materials & Structures >Experimental study on the contribution of the quantum tunneling effect to the improvement of the conductivity and piezoresistivity of a nickel powder-filled cement-based composite
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Experimental study on the contribution of the quantum tunneling effect to the improvement of the conductivity and piezoresistivity of a nickel powder-filled cement-based composite

机译：量子隧穿效应对改善镍粉填充水泥基复合材料电导率和压阻的贡献的实验研究

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摘要

The voltage—current characteristics of a nickel powder (NP)-filled cement-based composite (NPCC) and the variation of electrical resistivity of NPCC under compression are studied by using a four-pole method based on embedded loop electrodes. The generation of conductivity and piezoresistivity in NPCC is investigated by examining the morphology of NPCC by SEM and studying the variation of distance between NP particles under compression. Experimental results indicate that the electrical conductivity of NPCC is ohmic when the voltage is below 3.5 V. Although NP particles are dispersed in the cement matrix and they do not form a connected conductive network, NPCC has a low electrical resistivity of 2.29 x 103Q cm without loading. A decrease of 0.042% in the fractional change in volume of NPCC under compression causes the tunneling distance to decrease 0.60-1.42 nm and the fractional change in electrical resistivity to reach 62.61%. It is therefore concluded that the improvement of conductivity and piezoresistivity of NPCC is due to the quantum tunneling effect.
机译：通过基于嵌入式环形电极的四极方法研究了镍粉（NP）填充的水泥基复合材料（NPCC）的电压-电流特性以及NPCC压缩时的电阻率变化。通过扫描电镜观察NPCC的形貌并研究压缩下NP颗粒之间的距离变化，研究了NPCC中电导率和压阻率的产生。实验结果表明，当电压低于3.5 V时，NPCC的电导率为欧姆。尽管NP颗粒分散在水泥基体中并且没有形成连接的导电网络，但NPCC的电阻率为2.29 x 103Q cm加载中。压缩状态下NPCC体积分数变化减少0.042％，导致隧穿距离减小0.60-1.42 nm，电阻率分数变化达到62.61％。因此可以得出结论，NPCC的电导率和压阻率的提高是由于量子隧穿效应所致。

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