Abstract Detection of low concentration of acetone gas was carried out using porous CCTO-ZnO composites. The CCTO-ZnO composites were prepared via wet mixing method. The effects of ZnO (x = 0, 2, 6, and 10 wt%) addition on the structural, morphological, and optical properties of CCTO-ZnO powder were investigated by XRD, FTIR, FESEM-EDAX, BET, UV–vis, respectively, whereas the acetone gas sensing properties of CCTO-ZnO composites were studied by I-V characteristic. The XRD result showed a polycrystalline structure. The surface morphology of the powder exhibited a uniform distribution with intergranular porous microstructures. BET indicated average pore diameter (10.08, 10.70, 12.91, and 13.76 nm) and surface area (1.003 1.038, 1.594, and 2.029 m 2 g −1 ), respectively with increasing amount of ZnO. This is the cause for the reduction of optical transmittance and increase in their energy bandgap (1.97, 2.05, 2.08, and 2.10 eV). All samples depicted good transparency (≤ 80%) in the visible region. CCTO with the addition of 10 wt% ZnO composite showed the highest sensitivity and selectivity towards 1 ppm acetone gas. The composites had 1% error from earlier stability performance, and can possibly be utilized for practically applied in the detection of acetone gas.

中文翻译：

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CaCu 3 Ti 4 O 12 -ZnO复合材料在室温下对丙酮气体的高灵敏度和选择性

摘要 利用多孔CCTO-ZnO复合材料对低浓度丙酮气体进行检测。CCTO-ZnO复合材料采用湿混法制备。通过 XRD、FTIR、FESEM-EDAX、BET、UV-vis、分别通过IV特性研究CCTO-ZnO复合材料的丙酮气敏特性。XRD结果显示多晶结构。粉末的表面形貌呈现均匀分布的粒间多孔微结构。BET 表示平均孔径（10.08、10.70、12.91 和 13.76 nm）和表面积（1.003 1.038、1.594 和 2.029 m 2 g -1 ），分别随 ZnO 量的增加。这是光透射率降低和能带隙增加（1.97、2.05、2.08 和 2.10 eV）的原因。所有样品在可见光区域都表现出良好的透明度 (≤ 80%)。添加 10 wt% ZnO 复合材料的 CCTO 对 1 ppm 丙酮气体显示出最高的灵敏度和选择性。该复合材料与早期稳定性性能有1%的误差，可用于丙酮气体检测的实际应用。