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Synthesis of protein‐assisted aqueous Ag 2 S quantum dots in the bovine serum albumin solution
Author(s) -
Chen Xia,
Ding Ling,
Liu Peng,
Wang Qisui
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5417
Subject(s) - bovine serum albumin , chemistry , analytical chemistry (journal) , quantum dot , aqueous solution , quenching (fluorescence) , transmission electron microscopy , fourier transform infrared spectroscopy , absorption spectroscopy , particle size , absorption (acoustics) , fluorescence , x ray photoelectron spectroscopy , nuclear chemistry , crystallography , materials science , chromatography , nanotechnology , chemical engineering , physics , quantum mechanics , engineering , composite material
A one‐step method was developed for preparing Ag 2 S quantum dots (QDs) using a common protein [bovine serum albumin (BSA)] to entrap QDs precursors (BSA–Ag + ). Fluorescence (FL) and ultraviolet spectra showed that the molar ratio of Ag + /BSA, temperature, and pH are the crucial factors for the quality of QDs. The QDs absorption wavelength and emission wavelength were about 340 and 450 nm. The average QDs particle size was estimated to be less than 5 nm, determined by transmission electron microscopy. The X‐ray power diffraction and XPS results showed that the synthesized product was indeed monoclinic Ag 2 S. With Fourier transform infrared spectra and thermogravimetry analysis, there might be conjugated bonds between Ag 2 S QDs and –OH, –NH, and –SH groups in BSA. In addition, FL spectra suggest that the designed QDs can produce static quenching with BSA and the Stern–Volmer quenching constant ( K sv ) was calculated as 2.145 × 10 4 . Copyright © 2014 John Wiley & Sons, Ltd.