Cu_2O纳米晶制备及其在乙醇气体传感器中的应用

Preparation of Cu_2O nanocrystalline and its application in ethanol gas sensor

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。

In this work, a facile and mild synthetic approach involving CUEl2·H2O as raw material, sodium ascorbic as reductant and PEG-20000 as surfactant, nanocube with nanocrystalline structure is prepared using chemical mixing method. The effect of pH values on Cu20 nanostructure is studied, and the crystal phase and morphology are determined by using X-ray diffraction （XRD） and scanning electron microscope （SEM）. Furthermore, the gas sensitive properties of the sensor based on Cu20 nanocrystalline are tested. It can be seen that Cu20 nanocrystalline show remarkable sensitivity and good selectivity to C2 H5 OH. The best gas-sensitive property is obtained when the sintering temperature is about 600℃ and heat-treated for 2 h, its sensitivity to volume fraction 0. 006 % C2HsOH is up to 38 %, at the optimal working temperature （360℃）, exceed the limit of detection of ethanol gas （0. 008 % ） in human breath.