ZnO纳米线掺杂Ag对CO气体气敏特征的影响
Effect of ZnO Nano-wire Doped with Ag on Characteristic of CO Gas Sensitivity
王 鑫, 于灵敏, 范新会, 严 文
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作者单位：(西安工业大学 材料与化工学院, 陕西 西安 710032)
中文关键字：ZnO纳米线； 掺杂； 气敏特征； 响应时间
英文关键字：ZnO nano-wire; dope; gas sensor characteristic; response time
中文摘要：以纯Zn和Zn中掺杂Ag为原料在相同条件下用物理热蒸发法分别制备ZnO纳米线，对两种纳米线进行了SEM分析，并将其作为气敏基料制成旁热式气敏组件，对CO气体进行气敏性测试。结果表明，纯Zn制得的ZnO纳米线的形貌呈现放射状，分枝的直径均为约300 nm、长度约10 μm；而Zn中掺杂Ag制得的ZnO纳米线形貌虽也呈现放射状，但分枝的直径逐渐减小，最终成为点状，长度约3 μm； 在工作温度270 ℃下，两种纳米线对CO气体的灵敏度都达到最大值，且Zn中掺杂Ag相对于纯Zn的ZnO纳米线对CO气体灵敏度提高了61.5%；在CO浓度为0.27%时，两种纳米线的灵敏度也都达到最大值，Zn中掺杂Ag相对于纯Zn的ZnO纳米线对CO气体灵敏度提高了107.2%，也对CO气体的响应时间缩短了3 s。
英文摘要：ZnO nano-wire was prepared by thermal evaporation using pure Zn and Zn doping with Ag as raw material under the same condition. The morphology of the two nano-wires which were used as gas sensitivities matrix to make sensitive element was analyzed by SEM. The CO gas sensitivity was measured. The results indicate that ZnO nano-wires making with pure Zn present as a radial shape, branching diameter even approximately 300 nm, length approximately 10 μm; ZnO nanowires, which are made in Zn doping with Ag, the morphology is also presented as a radial, but the branching diameter gradually reduces, and ends in punctual, the length approximately 3 μm; at the operating temperature 270 ℃, the effect of two nano-wires on the sensitivity of CO gas can reach the maximum; and the sensitivity of the two nano-wires is also maximum; compared with pure Zn, ZnO nano-wires, which is made with Zn doping with Ag, the gas sensitivities is enhanced by 61.5%. The CO gas sensitivity at the operating temperature 270 ℃ is increased by 107.2%, the CO gas response time is reduced by 3 s, when the CO density sensitivitie is 0.27%.