文章信息

Sensitive and selective determination of H₂S has been widely reported. However, its gas sensing performance is vulnerable to some special environments such as high humidity. Especially, the sluggish response/recovery time and the unfavorable long-term stability are the main obstacles for H₂S gas sensing. Herein, carbon modification on coral-like WO₃ with bimodal pore distribution (mesopores and macropores) has been fabricated by one-step solvothermal method. Experimental results confirm that the coral-like carbon modified WO₃ based sensor has excellent H₂S sensing performance regarding its rapid response /recovery time (1 s/20 s) to 50 ppm H₂S at 275 °C and the low detection limitation at ppb level. In addition, the anti-humidity property and long-term stability are improved through carbon modification. Overall, the results demonstrate that carbon modification on WO₃ material and facile synthesis method might provide a potential platform for real-time and practical diagnosis of halitosis.