论文部分内容阅读
以采用物理热蒸发法制备的纯ZnO纳米线以及Ag掺杂ZnO纳米线为气敏基料制备成旁热式气敏元件,用静态配气法对不同浓度的H2进行气敏性能测试。利用测试结果,绘制元件灵敏度与所测气体浓度的关系曲线,并对此曲线进行了线性拟合。结果表明,Ag掺杂纳米ZnO元件与纯纳米ZnO元件相比会明显提高对H2的灵敏度,两类元件的气敏性能与所测气体浓度呈现相同的变化规律。用拟合方程计算出的气体浓度值与实际检测值间吻合较好,误差小于10%。因此,可以利用这两类元件及其拟合直线对H2气体浓度进行测定。
Pure ZnO nanowires and Ag-doped ZnO nanowires prepared by physical thermal evaporation were used as gas-sensitive substrates to prepare a by-product gas sensor. Gas sensitivities of H2 at different concentrations were tested by static gas distribution method. Using the test results, the curve of the relationship between the element sensitivity and the measured gas concentration is drawn, and the curve is linearly fitted. The results show that the sensitivity of Ag doped ZnO nanoparticles to H2 is significantly higher than that of pure ZnO nanoparticles. The gas sensing properties of the two types of elements show the same variation with the measured gas concentrations. The gas concentration calculated by fitting equation is in good agreement with the actual measured value, the error is less than 10%. Therefore, H2 gas concentrations can be measured using these two types of elements and their fitted straight lines.