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Preparation and Gas-sensing Characteristics of Na~+-doped ZnO Single Crystals

Suying PAN and Junbiao MAO (Center for Materials Research and Analysis , Wuhan University of Technology , Wuhan , 430070 , China)(To whom correspondence should be addressed)

材料科学技术（英文）

ZnO single crystals were grown by vapor phase reaction of Zno powder with active carbon powdei at an elevated temperature The typical crystals were colorless and transparent with maximum size o4 0.1 mm in diameter and 25 mm in length, The gas-sensing characteristics of Na+-doped anc undoped single crystals were investigated in 1 %H2. Co and CH, in air between 1 50 and 600℃. It was found that the undoped ZnO single crystals showed little gas sensitivity in air. and Na+-doping can greatly enhance the senstivity by increasing the resistivities. The maximum sensitivity of the samples is 22 (Ra/ Rg) for H2. 1 2 for CO and 4 for CH4

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用旋转电极研究低碳钢阳极溶解机理

吴庆余

中国腐蚀与防护学报

用旋转电极研究低碳钢阳极溶解机理吴庆余（武汉工学院武汉４３００７０）１前言钢铁的溶解过程非常复杂，不同的研究者得出的溶解机理不同［１－６］。其原因主要是由于所用材料及所处介质不同等多种因素造成。本工作参照工业锅炉盐酸酸洗的实际工况，在含有较大ＣＩ－浓度（１．５ｍｏｌ／Ｌ）的酸性介质中，测定低碳钢阳极溶解过程的电化学参数，以探求反应历程和动力学方程式。２实验方法研究电极用２０钢制成圆盘状，四周?...

关键词: null , Mechanism , Acidic chloride media

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