Yu Ziyang, Zhang Liang, Wang Xiangyue, He Dong, Suo Hui, Zhao Chun
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130118, China.
College of Chemistry, Jilin University, Changchun 130118, China.
Sensors (Basel). 2020 Sep 2;20(17):4961. doi: 10.3390/s20174961.
ZnO and carbon quantum dots (CQDs) were synthesized by a hydrothermal method, and CQDs were doped into ZnO by a grinding method to fabricate a ZnO/CQDs composite. The X-ray diffraction and the scanning electron microscope revealed that the as-prepared ZnO has a structure of wurtzite hexagonal ZnO and a morphology of a flower-like microsphere which can provide more surface areas to adsorbed gases. The ZnO/CQDs composite has a higher gas sensitivity response to NO gas than ZnO microspheres. A gas sensitivity test of the ZnO/CQDs composite showed that the sensor had a high NO response (238 for 100 ppm NO) and NO selectivity. The detection limit of the ZnO/CQDs composite to NO was 100 ppb and the response and recovery times were 34 and 36 s, respectively. The active functional group provided by CQDs has a significant effect on NO gas sensitivity, and the gas sensitivity mechanism of the ZnO/CQDs composite is discussed.
采用水热法合成了氧化锌（ZnO）和碳量子点（CQDs），并通过研磨法将CQDs掺杂到ZnO中制备了ZnO/CQDs复合材料。X射线衍射和扫描电子显微镜表明，所制备的ZnO具有纤锌矿型六方ZnO结构和花状微球形态，能够为吸附气体提供更多的表面积。ZnO/CQDs复合材料对NO气体的气敏响应比ZnO微球更高。对ZnO/CQDs复合材料进行的气敏测试表明，该传感器对NO具有高响应（对100 ppm NO的响应为238）和NO选择性。ZnO/CQDs复合材料对NO的检测限为100 ppb，响应时间和恢复时间分别为34 s和36 s。CQDs提供的活性官能团对NO气敏性有显著影响，并对ZnO/CQDs复合材料的气敏机理进行了探讨。
