Controlling the self-assembly and optical properties of gold nanoclusters and gold nanoparticles biomineralized with bovine serum albumin

Birgitte H. McDonagh, Gurvinder Singh, Sulalit Bandyopadhyay, Sina M. Lystvet, Joseph A. Ryan, Sondre Volden, Eugene Kim, Ioanna Sandvig, Axel Sandvig, Wilhelm Robert Glomm

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

While the size-dependent optical properties of BSA-stabilized gold nanoclusters are well known, the time-dependent growth mechanism remains to be described. Herein, we systematically compare two synthesis methods with and without ascorbic acid, and show that tuning of BSA-stabilized gold nanoclusters (AuNCs) of different sizes can be performed without the aid of an extrinsic reducing agent and with good reproducibility. We also show that adding ascorbic acid yields larger BSA-stabilized gold nanoparticles (AuNPs), and that AuNPs can only form above a threshold gold precursor concentration. Using computed tomography, we describe how these biomineralized AuNPs show size-dependent X-ray attenuation. Growth of BSA-stabilized AuNCs and AuNPs, over a range of gold precursor concentrations, was followed with steady-state fluorescence and UV-vis spectroscopy for one week, constituting the first study of its kind. Based on our results, we propose a mechanism for BSA-stabilization of AuNCs and AuNPs that can further aid in selective growth of discrete AuNCs and AuNPs.

Original languageEnglish
Pages (from-to)101101-101109
Number of pages9
JournalRSC Advances
Volume5
Issue number122
DOIs
Publication statusPublished - 19 Nov 2015
Externally publishedYes

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