Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

被引：52

作者：

Yu, Ziyang ^{[1
]}

Zhang, Liang ^{[1
]}

Wang, Xiangyue ^{[2
]}

He, Dong ^{[1
]}

Suo, Hui ^{[1
]}

Zhao, Chun ^{[1
]}

机构：

[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130118, Peoples R China

[2] Jilin Univ, Coll Chem, Changchun 130118, Peoples R China

来源：

SENSORS | 2020年 / 20卷 / 17期

关键词：

carbon quantum dots; ZnO; gas sensors; NO; NITRIC-OXIDE; TIN OXIDE; NANOPARTICLES; DISEASE;

D O I：

10.3390/s20174961

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：1 / 11

页数：11

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