Abstract

Polyvinylpyrrolidone (PVP)/CuO composites were synthesized using polymerization method for humidity sensing. The CuO nanosheets for composite were prepared by chemical reduction method. It was found that the PVP/CuO nanocomposite has compact structure while PVP was porous in nature. Humidity sensors using PVP, CuO, and PVP/CuO nanocomposite were fabricated by simple-drop casting method. Interdigitated copper electrodes with 50 μm gap were used for the casting of substrate in dust-free environment. The comparative study was performed at a constant temperature of 300 K with different frequencies using LCR meter. Resistance of the sensors was decreased to zero as the humidity concentration increased from 25 to 95% RH in the sensing assembly. An appreciable increase of 58.5–4370 nF (sensitivity 71,660%/%RH) was observed in capacitance with the increase of humidity level from 25 to 95% RH at 0.1 kHz frequency. A small hysteresis value of 6.7%, 1.8%, and 2.1% were observed for PVP, CuO, and PVP/CuO nanocomposite. When compared with PVP and CuO, an efficient response was recorded for PVP/CuO nanocomposite toward humidity sensing.

中文翻译：

---

聚乙烯吡咯烷酮（PVP）/ CuO纳米复合材料作为合适的室温湿度感测材料的功效：高灵敏度电容电阻式湿度传感器的制造

摘要

聚乙烯吡咯烷酮（PVP）/ CuO复合材料采用聚合法合成，用于湿度传感。采用化学还原法制备了复合材料用的CuO纳米片。发现PVP / CuO纳米复合材料具有致密结构，而PVP本质上是多孔的。通过简单滴铸法制备了使用PVP，CuO和PVP / CuO纳米复合材料的湿度传感器。在无尘环境中使用间距为50μm的叉指式铜电极浇铸基板。使用LCR表在300 K的恒定温度下以不同的频率进行比较研究。随着传感组件中湿度浓度从25％RH增加到95％RH，传感器的电阻减小到零。明显增加了58.5–4370 nF（灵敏度71，在0.1 kHz频率下，随着湿度水平从25％RH增加到95％RH，在电容中观察到660％/％RH）。对于PVP，CuO和PVP / CuO纳米复合材料，观察到的磁滞值为6.7％，1.8％和2.1％。当与PVP和CuO比较时，记录了PVP / CuO纳米复合材料对湿度感测的有效响应。