Abstract
Two Co-MOF-74 (Co-MOF-I and Co-MOF–II) were designed for the sensing of H2 gas. Owing to the high density of Co ions (+2 and + 3 states) located in metal clusters in the p-type phase, Co-MOF-74 exhibited better selectivity in gaseous H2 sensing, compared with those of Ni-MOF-74 and Mg-MOF-74. The Co-MOF-II sensor, with higher porosity and Co ion concentration than the Co-MOF-I sensor, had more adsorption sites; consequently, more target gas molecules were adsorbed, resulting in a stronger change in the underlying resistance and better sensing. The gas sensing performance, characterized in the present study, highlights the advantages of using Co-MOFs gas sensors, in terms of their safety, energy usage, and scope of applications.
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