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Fluorescence-Enhanced Sensing Mechanism of BSA-Protected Small Gold-Nanoclusters to Silver(I) Ions in Aqueous Solutions
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- Author(s): Li, Hong-Wei; Yue, Yuan; Liu, Tian-Ying; Li, Dongmei; Wu, Yuqing
- Source:
The Journal of Physical Chemistry - Part C; August 2013, Vol. 117 Issue: 31 p16159-16165, 7p - Source:
- Additional Information
- Abstract: We report the clarification of responsive mechanism of the BSA-protected small gold nanoclusters (Au16NCs@BSA) to silver(I) ions (Ag+). The titration of Au16NCs@BSA solutions with Ag+produces a blue-shift and enhancement of the fluorescence spectra, but no similar effects can be observed for other metal ions. Meanwhile, an isosbestic point in UV–vis absorbance spectra of Au16NCs@BSA induced by Ag+is observed, which indicates a stoichiometric conversion of one substance to another. Through X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and MALDI-TOF mass spectrum measurements, the reduction of Ag+to Ag0by Au16NCs@BSA have been ascertained, where the Au16NCs act as reductant toward Ag+in forming hybrid Au@AgNCs adducts. The mechanism revealed provided a facile and mild method to build high luminescent alloy nanoclusters.
- Abstract:
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