Studies on PVP, PVA and their nAg composites based humidity sensors

2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS) Pub Date : 2015-03-07 DOI:10.1109/ISPTS.2015.7220108

Poonam D. Mahapure, S. Gosavi, R. Aiyer

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引用次数: 5

Abstract

The nAg/PVP and nAg/PVA composites were synthesized by using chemical reduction method. The neat Poly vinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) at different concentrations and their nano metal polymer composites were studied for electrical humidity sensing, ranging from 5-90% RH. The neat polymers and their composites were coated on ceramic rods having built in electrodes by drop casting method. With increase in concentration, there is an increase in resistance by an order of magnitude. The PVA and PVP at 0.1% wt of polymer show large change in magnitude of resistance with humidity in the range 5-90 %RH hence is used for further studied for electrical humidity sensing. The formation of nAg/polymer composite is decided from data of UV-Visible. The nAg/polymer composites are characterized by UV-Visible, DLS and FTIR (at 5% and 85% RH). Samples of nAg/0.1% PVP show good sensitivity over a wide range of humidity (5-90% RH) as compared to nAg/0.1% PVA. The nAg/0.1% PVP has fast response and recovery, good repeatability and reproducibility as compared to nAg/0.1% PVA.

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基于PVP、PVA及其nAg复合材料的湿度传感器研究

采用化学还原法制备了nAg/PVP和nAg/PVA复合材料。研究了不同浓度的聚乙烯吡咯烷酮(PVP)和聚乙烯醇(PVA)及其纳米金属聚合物复合材料在5-90% RH范围内的电测湿度。采用滴铸法将这些整齐的聚合物及其复合材料涂覆在内置电极的陶瓷棒上。随着浓度的增加，阻力会增加一个数量级。当聚合物质量分数为0.1%时，PVA和PVP的电阻随湿度在5- 90% RH范围内的变化幅度较大，因此用于电湿度传感的进一步研究。通过紫外可见数据确定了nAg/聚合物复合材料的形成。nAg/聚合物复合材料在5%和85%相对湿度下通过紫外可见光谱、DLS和FTIR进行表征。与nAg/0.1% PVA相比，nAg/0.1% PVP样品在宽湿度范围内(5-90% RH)表现出良好的灵敏度。与nAg/0.1% PVA相比，nAg/0.1% PVP具有响应速度快、恢复速度快、重复性和再现性好的特点。

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2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)

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