Electrical and humidity characterization of m-NA doped Au/PVA nanocomposites
Electrical and humidity characterization of m-NA doped Au/PVA nanocomposites
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DOI：
10.1016/j.talanta.2008.12.014
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发表时间：
2009-04-30
期刊：
影响因子：
6.1
通讯作者：
Aiyer, R. C.
中科院分区：
文献类型：
--
作者：
Fuke, Madhavi V.;Adhyapak, P. V.;Aiyer, R. C.
掺杂的间硝基苯胺（m-NA）（通过改变重量百分比（wt.以金盐和水合肼（HH）为原料，采用原位合成法制备了金/聚乙烯醇（Au/PVA）纳米复合材料。将该复合材料通过滴铸法涂覆在具有两端电极的陶瓷棒上，以研究它们在不同相对湿度（RH）水平（在室温下从4至95%RH）下的电行为。优化的wt. %用于制备各种厚度（20-40 μ m）的膜涂层。随着湿度降低，电阻增加。低湿度感测特性可以通过改变wt. %的m-NA和纳米复合膜的厚度。连续湿度传感器显示出两个灵敏度区域，对于较低的RH具有最高的灵敏度。传感器的响应时间和恢复时间分别约为6-10 s和52 s。电阻变化的动态范围允许有前途的使用膜作为湿度传感器。通过X射线衍射（XRD）和60%RH下的阻抗谱对材料进行表征。(C)2008 Elsevier B. V.保留所有权利。
The Meta-Nitroaniline (m-NA) doped (by varying weight percentage (wt. %)) gold/polyvinyl alcohol (Au/PVA) nanocomposites were synthesized using gold salt and hydrazine hydrate (HH) by in situ process. The composite was coated on ceramic rods having two end electrodes by drop casting method for studying their electrical behavior at different relative humidity (RH) levels, ranging from 4 to 95% RH at room temperature. The optimized wt. % was used to prepare coatings of various thicknesses (20-40 mu m) of the films. As the humidity decreases, the resistance increases. The low humidity sensing characteristic can be tailored by varying wt. % of m-NA and thicknesses of the nanocomposite films. The resistive-humidity sensor shows two regions of sensitivity having highest sensitivity for lower RH. The sensor response and recovery time is about 6-10 s and 52 s respectively. The dynamic range of variation of the resistance allows a promising use of the films as a humidity sensor. The material was characterized by X-ray diffraction (XRD) and impedance spectroscopy at 60% RH. (C) 2008 Elsevier B.V. All rights reserved.