Journal
MICROCHIMICA ACTA
Volume 187, Issue 2, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-4090-5
Keywords
Metal nanoclusters; Thiol-beta-cyclodextrin; Host-guest recognition; Fluorometry; Colorimetry
Categories
Funding
- National Natural Science Foundation of China [21565030]
- Program for Excellent Young Talents of Yunnan University
- National Demonstration Center for Experimental Chemistry and Chemical Engineering Education (Yunnan University)
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A hydrothermal method was applied to the synthesis of green-emitting gold nanoclusters (Au NCs) which are shown to be viable fluorescent probes for 4-nitrophenol (4-NP). The Au NCs were prepared by using thiol-beta-cyclodextrin as a template. Under 365 nm excitation, their green fluorescence has a peak at 502 nm, with a narrow emission bandwidth of only 30 nm. The fluorescence and composition of the Au NCs were characterized and the mechanism of the nanocluster formation is discussed. Due to host-guest recognition of beta-cyclodextrin and 4-NP, fluorescence is quenched. The probe can selectively recognize 4-NP among other nitrophenols. A fluorometric and colorimetric assay was developed for 4-NP that works in the 0.1 to 100 mu M concentration range and has a detection limit of 90 nM (at 3 sigma). Graphical abstract Schematic representation of hydrothermal synthesis of green-emitting gold nanoclusters using thiol-beta-cyclodextrin. Fluorescence is quenched and the absorption of the nanoclusters is increases in the presence of 4-nitrophenol.
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