Fluorescence-Enhanced Sensing Mechanism of BSA-Protected Small Gold-Nanoclusters to Silver(I) Ions in Aqueous Solutions

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• 作者：Hong-Wei Li ; Yuan Yue ; Tian-Ying Liu ; Dongmei Li ; Yuqing Wu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：August 8, 2013
• 年：2013
• 卷：117
• 期：31
• 页码：16159-16165
• 全文大小：388K
• 年卷期：v.117,no.31(August 8, 2013)
• ISSN：1932-7455

文摘

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鈥搗is 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 Ag⁰ by 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.