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以CuCl2·H2O为主要原料,抗坏血酸作还原剂,聚乙二醇—20000(PEG—20000)作表面活性剂,利用化学混合法制备了纳米晶结构的Cu2O纳米立方体。研究了pH值对Cu2O纳米结构的影响,并用XRD和SEM对产物的物相和形貌进行了表征。将粉体制成气敏元件,气敏性能测试结果表明:该Cu2O纳米晶对乙醇气体具有较高的灵敏度和选择性。600℃热处理2 h材料气敏特性最好,在最佳工作温度(360℃)下对体积分数为0.006%的乙醇气体灵敏度可达到38%,达到了口腔乙醇气体体积分数检测限度0.008%的要求。
The Cu2O nanocubes with nanocrystalline structure were prepared by chemical mixing method using CuCl2 · H2O as the main raw material, ascorbic acid as reductant, and polyethylene glycol-20000 (PEG-20000) as the surfactant. The effect of pH on Cu2O nanostructures was investigated. The phase and morphology of the product were characterized by XRD and SEM. The gas sensor was made. The gas sensitivity test results show that the Cu2O nanocrystal has high sensitivity and selectivity to ethanol gas. The gas sensitivities of the materials treated at 600 ℃ for 2 h were the best, and the sensitivity of ethanol gas with the volume fraction of 0.006% could reach 38% under the optimum working temperature (360 ℃), which reached 0.008% of the detection limit of oral ethanol gas volume fraction .