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A novel strategy is reported for the synthesis of glutathione (GSH)‐protected bimetallic nanoclusters, Au‐AgNCs@GSH, and its fabrication with polyvinyl alcohol (PVA) into a film sensor for H2S gas detection. Meanwhile, carbon dots (CDs) synthesized from polyethyleneimine (PEI) are introduced as an internal standard to correct the photobleaching of Au‐AgNCs@GSH and uniformity of film. The joining of it greatly improves the chemical and structural stability of the composite film via multi cross‐linking between PEI, PVA, and GSH. The PVA‐AuAgNCs‐CDs film exhibits an emission‐quenching response to H2S gas at atmosphere, which is highly repeatable, fast, sensitive, and can distinguish H2S from other poisonous gases. Finally, the in‐depth mechanism investigations reveal that the quenching response is attributed to decomposition of Au‐AgNCs@GSH and the formation of Au2S and Ag2S in the composite film. As a sensor, the PVA‐supported film combines the functions of fluorescent metal nanoclusters and polymer CDs, providing a portable device for the rapid detection of H2S gas in air.
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Zhang et al. (2020) studied this question.
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