Journal
RSC ADVANCES
Volume 4, Issue 94, Pages 52279-52288Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra07581a
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- Loma Linda University
- Central Facility for Advanced Microscopy and Microanalysis (CFAMM) at the University of California Riverside (UCR)
- National Institute of Health Disparities and Minority Health of the National Institutes of Health [P20MD006988]
- National Institute on Minority Health and Health Disparities [P20MD006988] Funding Source: NIH RePORTER
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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 approximate to 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 (similar to 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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