研究目的
Investigating the enhancement of NO2 gas sensing properties through the development of ZnO/CdO heterojunction and the decoration with reduced graphene oxide (rGO).
研究成果
The ZnO/CdO/rGO composite exhibits enhanced NO2 sensing properties due to the formation of a heterojunction and the decoration with rGO. The composite shows high response, fast response and recovery times, and excellent stability and repeatability, making it a promising material for NO2 detection.
研究不足
The study focuses on the detection of NO2 at ppm levels and the operating temperature is optimized at 125°C, which may limit its application in environments requiring detection at different concentrations or temperatures.
1：Experimental Design and Method Selection:
A one-step hydrothermal method was used to synthesize the ZnO/CdO/rGO composite.
2：Sample Selection and Data Sources:
The composite was characterized using XRD, Raman, SEM, TEM, XPS, and UV-vis spectra.
3：List of Experimental Equipment and Materials:
The synthesis involved Zn(NO3)2·6H2O, Cd(NO3)2·4H2O, NH3·H2O, Na2CO3, and GO.
4：Experimental Procedures and Operational Workflow:
The mixture was poured into a Teflon-sealed autoclave and maintained at 180°C for 10 h, followed by thermal calcination at 400°C.
5：Data Analysis Methods:
The sensing properties were tested using the JF02E gas sensor test system, and the response was defined as the Rg/Ra ratio.
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