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首页> 外文期刊>Applied Surface Science >Comparative study of ethanol sensor based on gold nanoparticles: ZnO nanostructure and gold: ZnO nanostructure
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Comparative study of ethanol sensor based on gold nanoparticles: ZnO nanostructure and gold: ZnO nanostructure

机译：基于金纳米颗粒：ZnO纳米结构和金：ZnO纳米结构的乙醇传感器的比较研究

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Gold colloid:ZnO nanostructures were prepared from Zn powder by using thermal oxidation technique on alumina substrates, then it was impregnated by gold colloid for comparative study. The gold colloid is the solution prepared by chemical reduction technique; it appeared red color for gold nanoparticle solution and yellow color for gold solution. The heating temperature and sintering time of thermal oxidation were 700 ℃ and 24 h, respectively under oxygen atmosphere. The structural characteristics of gold colloid:ZnO nanostructures and pure ZnO nanostructures were studied using filed emission scanning electron microscope (FE-SEM). From FE-SEM images, the diameter and length of gold colloid:ZnO nanostructures and ZnO nanostructures were in the ranges of 100-500 nm and 2.0-7.0 μm, respectively. The ethanol sensing characteristics of gold colloid:ZnO nanostructures and ZnO nanostructures were observed from the resistance alteration under ethanol vapor atmosphere at concentrations of 50,100,200,500, and 1000 ppm with the operating temperature of 260-360 ℃. It was found that the sensitivity of sensor depends on the operating temperature and ethanol vapor concentrations. The sensitivity of gold colloid:ZnO nanostructures were improved with comparative pure ZnO nanostructures, while the optimum operating temperature was 300 ℃. The mechanism analysis of sensor revealed that the oxygen species on the surface was O~(2-).
机译：金胶体：采用热氧化技术在氧化铝基体上由锌粉制备出ZnO纳米结构，然后用金胶体进行浸渍研究。金胶体是通过化学还原技术制备的溶液。金纳米颗粒溶液呈现红色，金溶液呈现黄色。在氧气氛下，热氧化的加热温度和烧结时间分别为700℃和24 h。利用场发射扫描电子显微镜（FE-SEM）研究了金胶体的结构特征：ZnO纳米结构和纯ZnO纳米结构。根据FE-SEM图像，金胶体：ZnO纳米结构和ZnO纳米结构的直径和长度分别在100-500nm和2.0-7.0μm的范围内。在260,360℃的温度下，在50,100,200,500和1000ppm浓度的乙醇蒸气气氛下，电阻的变化观察到金胶体ZnO纳米结构和ZnO纳米结构的乙醇感测特性。发现传感器的灵敏度取决于工作温度和乙醇蒸气浓度。金胶体：ZnO纳米结构的灵敏度与比较纯的ZnO纳米结构相比有所提高，而最佳操作温度为300℃。传感器的机理分析表明，表面氧是O〜（2-）。

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