水热法制备石墨烯-SnO2复合材料的甲醛与乙醇敏感性能的研究

通过水热法制备石墨烯-SnO2复合材料,采用X射线衍射仪、扫描电子显微镜、红外光谱仪和拉曼光谱仪对石墨烯-SnO2复合材料进行表征。研究石墨烯掺杂比例和水热温度对石墨烯-SnO2复合材料敏感性能的影响;考察SnO2和质量分数0.1%石墨烯-SnO2（100℃,10 h）复合材料对应元件对甲醛、乙醇、丙酮、苯、乙酸和氨气6种气体的敏感性。结果表明：质量分数0.1%石墨烯-SnO2（100℃,10 h）复合材料对应元件对低浓度甲醛和低浓度乙醇有很好的敏感性,当工作温度为89℃时,质量分数0.1%石墨烯-SnO2（100℃,10 h）复合材料对应元件对φ（甲醛）=1′10^-3的灵敏度为13.6,响应恢复时间分别为44 s和170 s,对φ（甲醛）=1′10^-7的灵敏度可达1.2;当工作温度为165℃时,质量分数0.1%石墨烯-SnO2（100℃,10 h）复合材料对应元件对φ（乙醇）=1′10^-3的灵敏度为11,响应恢复时间分别为14 s和28 s,对φ（乙醇）=1′10^-7的灵敏度可达1.1。

Formaldehyde Gas Sensors Based on Graphene-SnO2 Composites Prepared by Hydrothermal Method

Graphene-SnO2（G-SnO2）composites were prepared with hydrothermal method. G-SnO2 composites were characterized by X-ray diffraction（XRD, Scanning electron microscopy（SEM）, Fourier transform infrared spectroscopy（FT-IR）, and Raman spectrum, respectively. The effect of graphene content and the hydrothermal temperature on the gas sensitivities of G-SnO2 composite materials was studied. The gas sensing properties of SnO2 sensor and mass fraction of 0.1%G-SnO2（100 ℃, 10 h）sensor to formaldehyde, ethanol, acetone, benzene, acetic acid,and ammonia were also studied. The results revealed that the sensor based on mass fraction of 0.1%G-SnO2（100 ℃,10 h）exhibited high responses to dilute formaldehyde and ethanol. When the operating temperature of mass fraction of 0.1%G-SnO2（100 ℃, 10 h）sensor was 89 ℃, the response to φ（formaldehyde）=1×10^-3 attained 13.6, the response time and recovery time for φ（formaldehyde）=1×10^-3 were 44 and 170 s, respectively; the response of mass fraction of 0.1%G-SnO2（100 ℃,10 h）sensor to φ（formaldehyde）=1×10^-7 attained 1.2; when the operating temperature of mass fraction of 0.1%G-SnO2（100 ℃, 10 h）sensor was 165 ℃, the response to φ（ethanol）=1×10^-3 attained11, the response time and recovery time for φ（ethanol）=1×10^-3 ethanol were 14 and 28 s, respectively; the response to φ（e th anol） = 1 ′ 10^-7 attained 1.1.