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Microbial synthesis of core/shell gold/palladium nanoparticles for applications in green chemistry

Deplanche, K. and Merroun, M. L. and Casadesus, M. and Tran, D. T. and Mikheenko, I. P. and Bennett, J. A. and Zhu, J. and Jones, I. P. and Attard, G. A. and Wood, J. and Selenska-Pobell, S. and Macaskie, L. E. (2012) Microbial synthesis of core/shell gold/palladium nanoparticles for applications in green chemistry. Journal of The Royal Society Interface. ISSN 1742-5689

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URL of Published Version: http://dx.doi.org/10.1098/​rsif.2012.0003

Identification Number/DOI: 10.1098/​rsif.2012.0003

We report a novel biochemical method based on the sacrificial hydrogen strategy to synthesize bimetallic gold (Au)–palladium (Pd) nanoparticles (NPs) with a core/shell configuration. The ability of Escherichia coli cells supplied with H2 as electron donor to rapidly precipitate Pd(II) ions from solution is used to promote the reduction of soluble Au(III). Pre-coating cells with Pd(0) (bioPd) dramatically accelerated Au(III) reduction, with the Au(III) reduction rate being dependent upon the initial Pd loading by mass on the cells. Following Au(III) addition, the bioPd–Au(III) mixture rapidly turned purple, indicating the formation of colloidal gold. Mapping of bio-NPs by energy dispersive X-ray microanalysis suggested Au-dense core regions and peripheral Pd but only Au was detected by X-ray diffraction (XRD) analysis. However, surface analysis of cleaned NPs by cyclic voltammetry revealed large Pd surface sites, suggesting, since XRD shows no crystalline Pd component, that layers of Pd atoms surround Au NPs. Characterization of the bimetallic particles using X-ray absorption spectroscopy confirmed the existence of Au-rich core and Pd-rich shell type bimetallic biogenic NPs. These showed comparable catalytic activity to chemical counterparts with respect to the oxidation of benzyl alcohol, in air, and at a low temperature (90°C).

Type of Work:Article
Date:March 2012 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Life & Environmental Sciences
Department:School of Biosciences
Subjects:QR Microbiology
Institution:University of Birmingham
Copyright Holders:the Royal Society
ID Code:1150
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