Crystal-Defect-Dependent Gas-Sensing Mechanism of the Single ZnO Nanowire Sensors

doi:10.1021/acssensors.8b00792

	Crystal-Defect-Dependent Gas-Sensing Mechanism of the Single ZnO Nanowire Sensors
	Zhou, XY; Wang, AQ; Wang, Y; Bian, LZ; Yang, ZX; Bian, YZ; Gong, Y; Wu, XF; Han, N; Chen, Y
刊名	ACS SENSORS
	2018
卷号	3 期号:11 页码:2385
关键词	ZnO nanowires TIN OXIDE microphotoluminescence MICRO-PHOTOLUMINESCENCE diameter OXYGEN-CHEMISORPTION space charge layer FLOWER-LIKE crystal defects ZINC-OXIDE gas sensor ETHANOL TEMPERATURE NANOSTRUCTURES SURFACE FILMS
ISSN号	2379-3694
DOI	10.1021/acssensors.8b00792
文献子类	Article
英文摘要	Though the chemical origin of a metal oxide gas sensor is widely accepted to be the surface reaction of detectants with ionsorbed oxygen, how the sensing material transduces the chemical reaction into an electrical signal (i.e., resistance change) is still not well-recognized. Herein, the single ZnO NW is used as a model to investigate the relationship between the microstructure and sensing performance. It is found that the acetone responses arrive at the maximum at the NW diameter (D) of similar to 110 nm at the D range of 80 to 400 nm, which is temperature independent in the temperature region of 200 degrees C-375 degrees C. The electrical properties of the single NW field effect transistors illustrate that the electron mobility decreases but electron concentration increases with the D ranging from similar to 60 nm to similar to 150 nm, inferring the good crystal quality of thinner ZnO NWs and the abundant crystal defects in thicker NWs. Subsequently, the surface charge layer (L) is calculated to be a constant of 43.6 +/- 3.7 nm at this D range, which cannot be explained by the conventional D-L model in which the gas-sensing maximum appears when D approximates 2L. Furthermore, the crystal defects in the single ZnO NW are probed by employing the microphotoluminescence technique. The mechanism is proposed to be the compromise of the two kinds of crystal defects in ZnO (i.e., more donors and fewer acceptors favor the gas-sensing performance), which is again verified by the gas sensors based on the NW contacts.
WOS记录号	WOS:000451495700024
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/26676]
专题	中国科学院过程工程研究所
推荐引用方式 GB/T 7714	Zhou, XY,Wang, AQ,Wang, Y,et al. Crystal-Defect-Dependent Gas-Sensing Mechanism of the Single ZnO Nanowire Sensors[J]. ACS SENSORS,2018,3(11):2385, 2393.
APA	Zhou, XY.,Wang, AQ.,Wang, Y.,Bian, LZ.,Yang, ZX.,...&Chen, Yunfa.(2018).Crystal-Defect-Dependent Gas-Sensing Mechanism of the Single ZnO Nanowire Sensors.ACS SENSORS,3(11),2385.
MLA	Zhou, XY,et al."Crystal-Defect-Dependent Gas-Sensing Mechanism of the Single ZnO Nanowire Sensors".ACS SENSORS 3.11(2018):2385.