水热法制备石墨烯-镓酸锌复合物及其气敏性能的研究

Gas sensing properties of graphene-ZnGa2O4composites prepared by hydrothermal method

摘要:

通过水热法制备了一系列的石墨烯-镓酸锌复合物。所制备的材料用XRD，SEM，TEM，拉曼和XPS进行表征。同时，探究了复合物的气敏性能。结果表明，石墨烯的含量对复合材料的气敏响应值和选择性有着很大的影响，并且当石墨烯的含量在0.1%时，复合材料的性能最好。当操作温度在203摄氏度时，0.1%石墨烯-镓酸锌复合材料对1000ppm的甲醛的响应值达32.2倍，最低检测限度为1ppm。同时，该材料的选择性也比较优越，对1000ppm甲醛和1000ppm丙酮的响应值的比值为26.8。该材料对1000ppm甲醛的响应和恢复时间分别为11秒和5秒，对1ppm甲醛的响应和恢复时间分别为6秒和5秒.

Abstract:

A series of Graphene-ZnGa2O4composites (G-ZnGa2O4) were synthesized by hydrothermal method. The prepared materials were characterized by means of XRD, SEM, TEM, Raman and XPS, respectively. The gas sensing properties of G-ZnGa2O4 composites were investigated. The results indicated that the graphene content has a great influence on the response and the gas sensing selectivity, the optimal composition of G-ZnGa2O4 gas sensing material was 0.1%G- ZnGa2O4. The sensor based on 0.1% G-ZnGa2O4 exhibited high response to 1000 ppm formaldehyde when operated at 203oC and the response reached 32.2; the detection limit for formaldehyde was as low as 1ppm; the gas sensing selectivity to formaldehyde was also good, the ratio of S1000 ppm formaldehyde and S1000 ppm acetone reached 26.8. The response time and recovery time for 1000 ppm formaldehyde were 11 s and 5 s, the response time and recovery time for 1 ppm formaldehyde were 6 s and 5 s, respectively.