Tan Qiulin, Fang Jiahua, Liu Wenyi, Xiong Jijun, Zhang Wendong
Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China.
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China.
Sensors (Basel). 2015 Nov 11;15(11):28502-12. doi: 10.3390/s151128502.
Iron oxide (Fe₂O₃) nanopowder was prepared by a precipitation method and then mixed with different proportions of carbon nanotubes. The composite materials were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. A fabricated heater-type gas sensor was compared with a pure Fe₂O₃ gas sensor under the influence of acetone. The effects of the amount of doping, the sintering temperature, and the operating temperature on the response of the sensor and the response recovery time were analyzed. Experiments show that doping of carbon nanotubes with iron oxide effectively improves the response of the resulting gas sensors to acetone gas. It also reduces the operating temperature and shortens the response recovery time of the sensor. The response of the sensor in an acetone gas concentration of 80 ppm was enhanced, with good repeatability.
采用沉淀法制备了氧化铁（Fe₂O₃）纳米粉末，然后将其与不同比例的碳纳米管混合。通过X射线粉末衍射、傅里叶变换红外光谱和扫描电子显微镜对复合材料进行了表征。在丙酮的影响下，将制备的加热器型气体传感器与纯Fe₂O₃气体传感器进行了比较。分析了掺杂量、烧结温度和工作温度对传感器响应及响应恢复时间的影响。实验表明，氧化铁掺杂碳纳米管有效地提高了所得气体传感器对丙酮气体的响应。它还降低了工作温度，缩短了传感器的响应恢复时间。在80 ppm丙酮气体浓度下，传感器的响应得到增强，具有良好的重复性。
