aHunan Nonferrous Metals Vocational and Technical College,Zhuzhou,Hu'nan 412006,China bSchool of Chemistry and Chemical Engineering,Hunan University ofScience and Technology,Xiangtan,Hu'nan 411201,China
Silver nanoclusters have special physical and chemical properties and wide potential applications. In this paper, a method of rapid preparation of stable silver nanoclusters with strong fluorescence characteristics and small particle size was developed by using chromotropic acid 2R as the stabilizer and pH regulation twice. Under the optimal experimental conditions, the maximum emission wavelength of silver nanoclusters prepared is 450 nm, the maximum excitation wavelength is 336 nm, and the average particle size is 1.74 nm. The main particles are distributed in the region of 0.682.99 nm, the lattice spacing of the silver nanocluster is 0.223 nm, and the lattice type is (102). The silver nanoclusters can be used as probes for the determination of trace heavy metal ions, non-metallic ions in solutions and small molecules, the detection of weak acid concentration, and cell imaging.
(A)The fluorescence intensity of silver nanoclusters synthesized under different BR buffer; (B)the fluorescence spectra of silver nanoclusters; (C)the fluorescence intensity of the silver nanoparticles with different volume of NaOH
Changes of fluorescence intensity of silver nanoclusters synthesized at different temperatures
The fluorescence intensity of silver nanoclusters synthesized at different reaction times
The excitation spectrum(A), emission spectrum(B) and ultraviolet visible absorption spectrum(C) of silver nanoclusters
TEM image(A), grain size distribution(B), and HRTEM image(C) of silver nanoclusters
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