Abstract In the present work, highly selective, stable and room temperature operable sensor of copper oxide (CuO), polyvinylpyrrolidone (PVP) and PVP/CuO nanocomposites were successfully fabricated on interdigitated copper electrode by using drop casting method. The CuO and PVP/CuO nanocomposites were synthesized via simple chemical reduction and ultrasonication method, respectively. Structural, morphological and elemental characterization of the PVP/CuO nanocomposites were carried out through X-ray diffractometer, Fourier transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy techniques. Successful synthesis of the nanocomposites with amorphous and crystalline nature was confirmed by the above-mentioned techniques. Gas sensing properties of the PVP/CuO nanocomposites were studied using different wt % (1–8) of CuO in the PVP matrix through LCR meter. It was observed that the sensor with 8 wt% CuO content exhibited an excellent selectivity and reproducibility towards NH3 gas at room temperature. A capacitance response of 160 nF was recorded for 200 ppm concentration of NH3 gas. The PVP/CuO 8 wt % nanocomposite sensor also showed an excellent stability over a period of 90 days (less than 5 % variation) and has very short response and recovery time of 17 s and 15 s respectively.

中文翻译：

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研究高灵敏度、选择性和稳定的氨 (NH3) 气体传感器：聚乙烯吡咯烷酮 (PVP)/CuO 纳米复合材料的结构、形态和气敏特性

摘要 在目前的工作中，采用滴铸法在叉指铜电极上成功制备了氧化铜 (CuO)、聚乙烯吡咯烷酮 (PVP) 和 PVP/CuO 纳米复合材料的高选择性、稳定和室温可操作传感器。CuO 和 PVP/CuO 纳米复合材料分别通过简单的化学还原和超声处理方法合成。PVP/CuO 纳米复合材料的结构、形态和元素表征通过 X 射线衍射仪、傅里叶变换红外光谱、扫描电子显微镜和能量色散 X 射线光谱技术进行。上述技术证实了具有无定形和结晶性质的纳米复合材料的成功合成。通过 LCR 计，在 PVP 基质中使用不同重量百分比 (1-8) 的 CuO 来研究 PVP/CuO 纳米复合材料的气敏特性。观察到具有 8 wt% CuO 含量的传感器在室温下对 NH3 气体表现出优异的选择性和重现性。对于 200 ppm 浓度的 NH3 气体，记录到 160 nF 的电容响应。PVP/CuO 8 wt % 纳米复合传感器在 90 天的时间内也表现出出色的稳定性（变化小于 5%），并且响应时间和恢复时间分别为 17 秒和 15 秒。