氧化还原
催化作用
硫化氢
兴奋剂
材料科学
硫化氢传感器
吸附
选择性
化学工程
硫化物
解吸
热解
无机化学
化学
硫黄
物理化学
有机化学
光电子学
工程类
冶金
作者
Ki Beom Kim,Myung Sung Sohn,Sun-Hong Min,Ji‐Wook Yoon,Jin‐Sung Park,Ju Li,Young Kook Moon,Yun Chan Kang
出处
期刊:Small
[Wiley]
日期:2024-03-10
标识
DOI:10.1002/smll.202308963
摘要
The precise and reversible detection of hydrogen sulfide (H2 S) at high humidity condition, a malodorous and harmful volatile sulfur compound, is essential for the self-assessment of oral diseases, halitosis, and asthma. However, the selective and reversible detection of trace concentrations of H2 S (≈0.1 ppm) in high humidity conditions (exhaled breath) is challenging because of irreversible H2 S adsorption/desorption at the surface of chemiresistors. The study reports the synthesis of Fe-doped CuO hollow spheres as H2 S gas-sensing materials via spray pyrolysis. 4 at.% of Fe-doped CuO hollow spheres exhibit high selectivity (response ratio ≥ 34.4) over interference gas (ethanol, 1 ppm) and reversible sensing characteristics (100% recovery) to 0.1 ppm of H2 S under high humidity (relative humidity 80%) at 175 °C. The effect of multi-valent transition metal ion doping into CuO on sensor reversibility is confirmed through the enhancement of recovery kinetics by doping 4 at.% of Ti- or Nb ions into CuO sensors. Mechanistic details of these excellent H2 S sensing characteristics are also investigated by analyzing the redox reactions and the catalytic activity change of the Fe-doped CuO sensing materials. The selective and reversible detection of H2 S using the Fe-doped CuO sensor suggested in this work opens a new possibility for halitosis self-monitoring.
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