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Single metal atoms offer a promising strategy to enhance the gas sensing performance of metal oxides due to their maximized atomic exposure, exceptional catalytic activity, and high utilization efficiency. This review provides a comprehensive analysis of recent progress in gas sensors based on single metal atom-modified metal oxides. Typical synthesis methods for anchoring single metal atoms are summarized, and their influence on the physical and chemical properties of metal oxide substrates is discussed. The enhanced sensing mechanisms of single metal atom-modified metal oxides are thoroughly examined. In addition, the review presents a detailed evaluation of the gas sensing performance achieved through modification with widely studied single metal atoms, including Pt, Au, Pd, Ni, Ag, Rh, and Cu. The potential challenges and prospective practical applications of these materials are also addressed. Overall, the findings underscore that single-atom modification represents a highly promising approach to significantly boost the sensing capabilities of metal oxides.
Yang et al. (Thu,) studied this question.