Abstract Uniform mesoporous particles of CuO were synthesized by thermal decomposition of precursor basic copper carbonate (BCC). The precursor was obtained by co-precipitation method using Cu(NO3)·3H2O and urea as reactant without any additives. Characterization studies including Fourier transform infrared spectrometry (FTIR), X-ray diffraction analysis (XRD), surface area and pore size analyzer and scanning electron microscopy (SEM) was used to investigate the structural, crystallographic, surface area, pore size distribution and morphological properties of basic copper carbonate and CuO. The particles were spherical in shape with uniform sizes. However, the surfaces of basic copper carbonate particles were smooth while CuO particles were of porous appearance. Additional physical characterization revealed that CuO was of mesoporous nature with surface area and average pore diameter 56.25 m2/g and 32–37 nm, respectively. The calcined CuO was fabricated for room temperature humidity detection. The material exhibited reproducible, stable, highly sensitivity and selective response towards humidity with response and recovery time less than 1 s each. The sensing mechanism was proposed to be based on protonic model wherein the generation of protons (charge carriers) reduced the sensor resistance due to their hopping from one active site to another while the capacitance enhanced due to increase in the dielectric constant of the humid sensing layer.

中文翻译：

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介孔CuO颗粒室温湿度传感性能研究

摘要 通过前体碱式碳酸铜（BCC）的热分解合成了均匀的介孔CuO颗粒。以Cu(NO3)·3H2O和尿素为反应物，不添加任何添加剂，通过共沉淀法获得前驱体。包括傅里叶变换红外光谱 (FTIR)、X 射线衍射分析 (XRD)、表面积和孔径分析仪和扫描电子显微镜 (SEM) 在内的表征研究用于研究结构、晶体学、表面积、孔径分布和形态碱式碳酸铜和CuO的性质。颗粒呈球形，大小均匀。然而，碱式碳酸铜颗粒的表面是光滑的，而 CuO 颗粒的外观是多孔的。额外的物理表征表明，CuO 具有介孔性质，表面积和平均孔径分别为 56.25 m2/g 和 32-37 nm。制备煅烧的 CuO 用于室温湿度检测。该材料对湿度表现出可重现、稳定、高灵敏度和选择性响应，响应时间和恢复时间均小于 1 秒。提出了基于质子模型的传感机制，其中质子（电荷载流子）的产生降低了传感器电阻，因为它们从一个活性位点跳到另一个活性位点，而电容由于湿度传感层的介电常数增加而增强. 该材料对湿度表现出可重现、稳定、高灵敏度和选择性响应，响应时间和恢复时间均小于 1 秒。提出了基于质子模型的传感机制，其中质子（电荷载流子）的产生降低了传感器电阻，因为它们从一个活性位点跳到另一个活性位点，而电容由于湿度传感层的介电常数增加而增强. 该材料对湿度表现出可重现、稳定、高灵敏度和选择性响应，响应时间和恢复时间均小于 1 秒。提出了基于质子模型的传感机制，其中质子（电荷载流子）的产生降低了传感器电阻，因为它们从一个活性位点跳到另一个活性位点，而电容由于湿度传感层的介电常数增加而增强.