The problem of detecting the toxic hydrogen sulfide (H₂S) gas at part per million levels in air by means of simple solid state gas sensors is relevant to environmental and gas processing industries. In this work, high-performance H₂S gas sensors are developed based on nickel-doped calcium copper titanate (Ni-doped CCTO) thin films synthesized by a sol-gel method. From gas-sensing measurements, the response of Ni-doped CCTO sensing films increased substantially with increasing Ni doping level from 1.5 to 7.3 wt%, revealing a catalytic effect of Ni on the surface reactions with adsorbed H₂S molecules. In particular, 7.3 wt% Ni-doped CCTO sensors offered a high response of 120 for 10 ppm of H₂S at the optimal operating temperature of 250 °C, an order of magnitude higher than that of undoped one. In addition, the response time dropped significantly from ∼80 s to ∼4 s while the recovery time slightly improved as the Ni doping content increased from 0 to 7.3 wt%. Moreover, the Ni-doped CCTO sensors exhibited good reproducibility and high H₂S selectivity against ethanol, H₂, NO₂ and NH₃. Therefore, the Ni-doped CCTO sensors are highly promising for sensitive and selective detections of H₂S.

通过简单的固态气体传感器检测空气中百万分之几的有毒硫化氢（H ₂ S）气体的问题与环境和气体处理行业有关。在这项工作中，基于通过溶胶-凝胶法合成的镍掺杂钛酸铜铜（Ni掺杂CCTO）薄膜开发了高性能H ₂ S气体传感器。从气体感测测量，随着Ni掺杂水平从1.5wt％增加到7.3wt％，Ni掺杂的CCTO感测膜的响应显着增加，揭示了Ni对与吸附的H ₂ S分子的表面反应的催化作用。尤其是，7.3 wt％的Ni掺杂CCTO传感器对10 ppm H ₂提供了120的高响应S在250°C的最佳工作温度下，比未掺杂的S高一个数量级。另外，响应时间从约80 s下降到约4 s，而恢复时间随着Ni掺杂含量从0到7.3 wt％的增加而略有改善。此外，掺Ni的CCTO传感器表现出良好的再现性和对乙醇，H ₂，NO ₂和NH _3的高H ₂ S选择性。因此，Ni掺杂的CCTO传感器对于H ₂ S的灵敏和选择性检测非常有前途。