【摘要】 用可溶性无机盐法 (ISG法 )制备掺杂Al3 + 的ZnO纳米气敏材料 ,用D/Max0 rB型X 射线粉末衍射仪研究纳米晶的结构。结果表明制备的掺铝ZnO纳米材料属于六方晶系 ,纤锌矿结构。用Scherrer公式计算得ZnO和掺铝ZnO的平均晶粒分别为 4 0nm和 35nm。用掺铝的ZnO纳米粉做成气敏元件 ,测试了不同铝含量的纳米材料在不同浓度的乙醇气体和氢气下的敏感特性。结果表明随着气体浓度的增加 ,灵敏度逐渐上升 ;随着Al含量的减少 ,材料气敏灵敏性逐渐增强。当铝含量为Al/ZnO =0 5 % (mol)时 ,对 0 2 %的乙醇气体的灵敏度最大可达到12 7。并讨论了纳米材料对敏感气体的物理吸附和化学吸附以及纳米氧化物的气敏机理更多还原

【Abstract】 Nanometer ZnO doped with Al 3+ was prepared by ISG method,and the structure was studied by XRD medhod.The Nanocrystalline ZnO belongs to Hexagonal System.The gas sensors were prepared by nano-ZnO doped with Al 3+,and the gas sensing properties were investigated towards different concentration of C 2H 5OH and H 2 gases.Results show that the gas sensitivity increases with the increase of gas concentration,and decreased with doping of Al 3+.A composition of 0.5mol% Al-ZnO sensor shows a maximum sensitivity of 127 towards 2000ppm of C 2H 5OH.The physical adsorption and chemical adsorption were discussed and the gas senging mechanism was also studied.更多还原