Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 41, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202000120
Keywords
carbon dots; composite films; gas detection; hydrogen sulfide; metal nanoclusters; polyvinyl alcohol
Categories
Funding
- NSFC [21875085, 21373101, 91027027]
- Opening Program of the State Key Laboratory of Supramolecular Structure and Materials, Jilin University
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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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