Effect of Cd Doping on the Gas-Sensitive Properties of ZnSn(OH)6
Yufeng Wen, Yanlin Yu, Huaizhang Gu, Guilian Wang, Fangqiang Yuan
TL;DR
This paper shows that adding Cd to ZnSn(OH)6 improves its ability to detect ethanol gas by altering its electronic structure and surface properties.
Contribution
The novel contribution is demonstrating that Cd doping enhances ethanol sensing performance through narrowed band gap and increased surface O− ion adsorption.
Findings
Cd-doped ZHS shows doubled ethanol gas response compared to pure ZHS under 240 °C and 100 ppm conditions.
Cd doping reduces particle size and increases electron concentration, improving ethanol sensing.
Theoretical calculations link enhanced performance to narrowed band gap and stronger O− ion adsorption.
Abstract
The influence of Cd doping on the performance of ZnSn(OH)6 (ZHS) as a gas sensor was systematically investigated through experimental and theoretical approaches. ZHS and Cd-doped ZHS samples were synthesized using the hydrothermal method. The microstructures of pure and Cd-doped ZHS were characterized using various techniques. The results revealed that the pure ZHS sample exhibits good crystallinity and an octahedral morphology with particle sizes ranging from 800 to 1900 nm. After Cd doping, the particle size range was decreased to 700–1500 nm. A systematic investigation of the gas-sensing properties revealed that Cd-doped ZHS exhibits superior sensing performance toward ethanol gas compared to pure ZHS. Under operating conditions of 240 °C, 100 ppm concentration, and 30% relative humidity, the response of ZHS to ethanol gas exhibited a significantly higher value compared to other…
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Taxonomy
TopicsGas Sensing Nanomaterials and Sensors · ZnO doping and properties · Electronic and Structural Properties of Oxides