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Polyvinyl Alcohol–Supported AuAgNCs‐CDs Film as a Selective Sensor for Gas Hydrogen Sulfide Detection in Air
Author(s) -
Zhang ChunXia,
Li HongWei,
Wu Yuqing
Publication year - 2020
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000120
Subject(s) - polyvinyl alcohol , nanoclusters , materials science , hydrogen sulfide , quenching (fluorescence) , chemical engineering , composite number , bimetallic strip , polymer , hydrogen , nanocages , nanoparticle , polyvinyl butyral , cadmium sulfide , nanotechnology , fluorescence , sulfur , chemistry , metal , organic chemistry , composite material , catalysis , physics , engineering , metallurgy , quantum mechanics
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 H 2 S 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 H 2 S gas at atmosphere, which is highly repeatable, fast, sensitive, and can distinguish H 2 S 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 Au 2 S and Ag 2 S 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 H 2 S gas in air.