Journal
ACS NANO
Volume 5, Issue 11, Pages 8800-8808Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn202860s
Keywords
nanoclusters; metal nanomaterials; silver; phase transfer; fluorescence
Categories
Funding
- Ministry of Education, Singapore [R-279-000-295-133, R-279-000-327-112]
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This paper reports a simple and scalable method for the synthesis of highly fluorescent Ag, Au, Pt, and Cu nanoclusters (NCs) based on a mild etching environment made possible by phase transfer via electrostatic interactions. Using Ag as a model metal, a simple and fast (total synthesis time < 3 h) phase transfer cycle (aqueous -> organic (2 h incubation) -> aqueous) has been developed to process originally polydisperse, nonfluorescent, and unstable Ag NCs Into monodisperse, highly fluorescent, and extremely stable Ag NCs in the same phase (aqueous) and protected by the same thiol ligand. The synthetic protocol was successfully extended to fabricate highly fluorescent Ag NCs protected by custom-designed peptides with desired functionalities (e.g., carboxyl, hydroxyl, and amine). The facile synthetic method developed in this study should largely contribute to the practical applications of this new class of fluorescence probes.
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