ighly sensitive and selective hydrogen single-nanowire nanosensor
ighly sensitive and selective hydrogen single-nanowire nanosensor
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2012
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通讯作者：
.. Lupana-Lupana-2103105798;L. Chowa;T. Pauportéb;L. K. Onoa;B. R. Cuenyaa;G. Chaia
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作者：
.. Lupana-Lupana-2103105798;L. Chowa;T. Pauportéb;L. K. Onoa;B. R. Cuenyaa;G. Chaia
金属氧化物如ZnO已经被用作氢传感器多年。通过掺杂，提高了氧化锌对氢气的气敏性。采用电沉积法生长了高长径比的镉掺杂氧化锌纳米线。单掺杂ZnO纳米线已被隔离和接触，形成纳米器件。与以前报道的基于纯单ZnO纳米线或多个纳米线的H2纳米传感器相比，这种纳米系统在室温下对氢气的检测表现出增强的气体响应和选择性。观察到单个Cd-ZnO纳米线的气体响应对NW直径和Cd含量的依赖。结果表明，镉掺杂的单晶氧化锌纳米线可以用来优化其响应气体，而不需要外部加热器。负责对氢的这种改进的响应的传感机制是
Metal oxides such as ZnO have been used as hydrogen sensors for a number of years. Through doping, the gas response of zinc oxide to hydrogen has been improved. Cadmium-doped ZnO nanowires (NWs) with high aspect ratio have been grown by electrodeposition. Single doped ZnO NWs have been isolated and contacted to form a nanodevice. Such nanosystem demonstrates an enhanced gas response and selectivity for the detection of hydrogen at room temperature compared to previously reported H2 nanosensors based on pure single-ZnO NWs or multiple NWs. A dependence of the gas response of a single Cd–ZnO nanowire on the NW diameter and Cd content was observed. It is shown that cadmium-doping in single-crystal zinc oxide NWs can be used to optimize their response to gases without the requirement of external heaters. The sensing mechanisms responsible for such improved response to hydrogen are