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300nm、长度约10μm;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3μm;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3s。
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%.
出处
《热加工工艺》
CSCD
北大核心
2011年第10期94-97,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51072156/E0207)
关键词
ZNO纳米线
掺杂
气敏特征
响应时间
ZnO nano-wire
dope
gas sensor characteristic
response time
