Highly Sensitive and Selective H2S Gas Sensor Based on Co32 Cluster

Abstract

Hydrogen sulfide (H2S), as a typical colorless, flammable and poisonous gas having rotten eggs smell, can paralyze the nervous and respiratory system and even lead to death. Therefore, developing a fast and highly sensitive H2S gas sensor is urgently required. Metal clusters feature small size structures, large surface areas and polymetallic centers, demonstrating giant potential on catalysis applications. Moreover, the high-density absorption sites make it easier for clusters to interact with target molecules. Here, we reported a novel H2S gas sensor based on a polynuclear cobalt cluster compound {Co32}. At the optimal working temperature of 200 ℃, the sensor based on {Co32} exhibits an outstanding H2S selectivity against other interfering gases, such as carbon monoxide, methane, and ethanol. In addition, it is of great importance to design low detection limit H2S sensor with fast response and recovery time. Gas sensitivity test results show the presented {Co32} gas sensor exhibits fast response and recovery of 15 s and 34 s under 100 ppb H2S, respectively. Moreover, the sensor also has a good linearity property from 20 ppb to 1000 ppb, good reproducibility and stability with time and under different humidity conditions. Prominently, the distinctive sensing performance of cobalt cluster for H2S promotes the development of metal clusters in the field of gas sensing. Figure 1