Synthesis and catalytic activity of pluronic stabilized silver–gold bimetallic nanoparticles

Megan S. Holden; Kevin E. Nick; Mia Hall; Jamie R. Milligan; Qiao Chen; Christopher C. Perry

doi:10.1039/C4RA07581A

Synthesis and catalytic activity of pluronic stabilized silver–gold bimetallic nanoparticles†

Megan S. Holden,^a Kevin E. Nick,^b Mia Hall,^c Jamie R. Milligan,^d Qiao Chen^e and Christopher C. Perry*^a

* Corresponding authors

^a Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA 92350, USA
E-mail: chperry@llu.edu

^b Department of Earth and Biological Sciences, School of Medicine, Loma Linda University, Loma Linda, CA 92350, USA

^c Elizabeth City State University, 1704 Weeksville Rd, Elizabeth City, NC 27909, USA

^d Department of Radiology, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA 92093, USA

^e Chemistry Department, School of Life Sciences, Sussex University, Brighton, UK

Abstract

In this report, we demonstrate a rapid, simple, and green method for synthesizing silver–gold (Ag–Au) bimetallic nanoparticles (BNPs). We used a novel modification to the galvanic replacement reaction by suspending maltose coated silver nanoparticles (NPs) in ≈2% aqueous solution of EO₁₀₀PO₆₅EO₁₀₀ (Pluronic F127) prior to HAuCl₄ addition. The Pluronic F127 stabilizes the BNPs, imparts biocompatibility, and mitigates the toxicity issues associated with other surfactant stabilizers. BNPs with higher Au : Ag ratios and, subsequently, different morphologies were successfully synthesized by increasing the concentration of gold salt added to the Ag NP seeds. These BNPs have enhanced catalytic activities than typically reported for monometallic Au or Ag NPs (∼2–10 fold) of comparable sizes in the sodium borohydride reduction of 4-nitrophenol. The 4-nitrophenol reduction rates were highest for partially hollow BNP morphologies.

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DOI: https://doi.org/10.1039/C4RA07581A
Article type: Paper
Submitted: 24 Jul 2014
Accepted: 07 Oct 2014
First published: 13 Oct 2014

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RSC Adv., 2014,4, 52279-52288

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Synthesis and catalytic activity of pluronic stabilized silver–gold bimetallic nanoparticles

M. S. Holden, K. E. Nick, M. Hall, J. R. Milligan, Q. Chen and C. C. Perry, RSC Adv., 2014, 4, 52279 DOI: 10.1039/C4RA07581A

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Synthesis and catalytic activity of pluronic stabilized silver–gold bimetallic nanoparticles†

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Synthesis and catalytic activity of pluronic stabilized silver–gold bimetallic nanoparticles

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