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Synthesis of surfactant-free electrostatically stabilized gold nanoparticles by plasma-induced liquid chemistry

Patel, J, N�mcová, L, Maguire, PD, Graham, W G and Mariotti, D (2013) Synthesis of surfactant-free electrostatically stabilized gold nanoparticles by plasma-induced liquid chemistry. Nanotechnology, 24 (24). p. 245604. [Journal article]

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URL: http://stacks.iop.org/0957-4484/24/i=24/a=245604

Abstract

Plasma-induced non-equilibrium liquid chemistry is used to synthesize gold nanoparticles (AuNPs) without using any reducing or capping agents. The morphology and optical properties of the synthesized AuNPs are characterized by transmission electron microscopy (TEM) and ultraviolet�visible spectroscopy. Plasma processing parameters affect the particle shape and size and the rate of the AuNP synthesis process. Particles of different shapes (e.g. spherical, triangular, hexagonal, pentagonal, etc) are synthesized in aqueous solutions. In particular, the size of the AuNPs can be tuned from 5 nm to several hundred nanometres by varying the initial gold precursor (HAuCl 4 ) concentration from 2.5 μM to 1 mM. In order to reveal details of the basic plasma�liquid interactions that lead to AuNP synthesis, we have measured the solution pH, conductivity and hydrogen peroxide (H 2 O 2 ) concentration of the liquid after plasma processing, and conclude that H 2 O 2 plays the role of the reducing agent which converts Au +3 ions to Au 0 atoms, leading to nucleation growth of the AuNPs.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:26260
Deposited By: Professor Davide Mariotti
Deposited On:06 Jun 2013 12:15
Last Modified:17 Oct 2017 16:09

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