Affiliation:
1. Department of Chemical Sciences University of Padova Via Marzolo, 1 Padova 35131 Italy
2. CNR‐IOM TASC Laboratory Area Science Park Basovizza S.S. 14, km 163.5 Trieste 34149 Italy
3. Abdus Salam International Centre for Theoretical Physics Via Beirut, 6 Trieste 34151 Italy
4. Area Science Park Padriciano 99 Trieste 34149 Italy
Abstract
AbstractUnderstanding the interactions between amines and the surface of gold nanoparticles is important because of their role in the stabilization of the nanosystems, in the formation of the protein corona, and in the preparation of semisynthetic nanozymes. By using fluorescence spectroscopy, electrochemistry, X‐ray photoelectron spectroscopy, high‐resolution transmission electron microscopy, and molecular simulation, a detailed picture of these interactions is obtained. Herein, it is shown that amines interact with surface Au(0) atoms of the nanoparticles with their lone electron pair with a strength linearly correlating with their basicity corrected for steric hindrance. The kinetics of binding depends on the position of the gold atoms (flat surfaces or edges) while the mode of binding involves a single Au(0) with nitrogen sitting on top of it. A small fraction of surface Au(I) atoms, still present, is reduced by the amines yielding a much stronger Au(0)–RN.+(RN., after the loss of a proton) interaction. In this case, the mode of binding involves two Au(0) atoms with a bridging nitrogen placed between them. Stable Au nanoparticles, as those required for robust semisynthetic nanozymes preparation, are better obtained when the protein is involved (at least in part) in the reduction of the gold ions.
Funder
China Scholarship Council
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
6 articles.
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