Sb掺杂二氧化锡单片纳米带的气敏特性研究

Gas Sensing Properties of a Single Sb-doped SnO_2 Nanoribbon

利用热蒸发法制备了纯净的SnO2纳米带及Sb掺杂SnO2纳米带。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、透射电子显微镜(TEM)和气敏测试仪器对其结构和性能进行了表征和测试。结果表明纳米带表面光滑,厚度约为50nm。纯净SnO2纳米带为理想的单晶结构,掺杂Sb后并没有改变二氧化锡的晶体结构和晶胞参数。使用单根Sb掺杂和纯净的SnO2纳米带制作成传感器并进行气敏性能测试,结果显示:Sb掺杂SnO2纳米带对乙二醇和丙酮的最佳响应温度为180℃,在100×10-6浓度下对乙二醇和丙酮的气敏响应分别为10倍和1.2倍;对乙醇的最佳响应温度为200℃,响应为2.6倍。在最佳响应温度,随乙二醇浓度的增加器件气敏响应增强,其响应时间随乙二醇浓度的增加而缩短,在50×10-6及100×10-6时,其响应时间分别为15s和14s。

Pure SnOz nanoribbons （SnOz NRs） and Sb-doped SnOz nanoribbons （Sb-SnOz NRs） were synthe- sized successfully by thermal evaporation. The structures and properties of the obtained SnOz NRs were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive X-ray spectroscopy （EDX）, transmission electron microscopy （TEM）. It was found that nanoribbons had a smooth surface with thickness of about 50 nm Pure SnO2 NRs have an ideal single-crystal structure, and doping did not change the crystal structure and pa- rameters. A novel ethanediol sensor based on a single Sb-SnOz nanoribbon or SnOz nanoribbon was fabricated. The sensing properties of SnO2 nanoribbon （SnOz NR） and Strdoped SnOz nanoribbon（Sb-SnO2 NR）sensors were investi- gated. The results revealed that the optimum sensing temperature of the Sb-SnO2 NR was 180 ℃ ,and the correspon- ding S value were 10 and 1.2 to 100× 10-6 ethanediol and acetone gases, respectively. The optimum sensing tempera- ture of the Sb-SnOz NR sensor was 200 ℃, while S value was reduced to 2.6 when exposed to 100× 10-6 ethanol gas. The response of the Sb-SnOz NR sensor increased with the increase of concentration of ethanediol gas and the response time were 15 s and 14 s as its concentrations were 50× 10-6 and 100× 10-6 respectively at the optimum sensing tem- perature.