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

J Patel, L N�mcová, PD Maguire, W G Graham, D Mariotti

Research output: Contribution to journalArticle

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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.
LanguageEnglish
Pages245604
JournalNanotechnology
Volume24
Issue number24
Publication statusPublished - 2013

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Surface-Active Agents
Gold
Plasma applications
Nanoparticles
Plasmas
Liquids
Reducing Agents
Hydrogen Peroxide
Nucleation
Optical properties
Spectroscopy
Ions
Transmission electron microscopy
Atoms

Cite this

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title = "Synthesis of surfactant-free electrostatically stabilized gold nanoparticles by plasma-induced liquid chemistry",
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{\^a}��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.{\^A} spherical, triangular, hexagonal, pentagonal, etc) are synthesized in aqueous solutions. In particular, the size of the AuNPs can be tuned from 5{\^A} nm to several hundred nanometres by varying the initial gold precursor (HAuCl 4 ) concentration from 2.5{\^A} {\^I}¼M to 1 mM. In order to reveal details of the basic plasma{\^a}��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.",
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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; Mariotti, D.

In: Nanotechnology, Vol. 24, No. 24, 2013, p. 245604.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis of surfactant-free electrostatically stabilized gold nanoparticles by plasma-induced liquid chemistry

AU - Patel, J

AU - N�mcová, L

AU - Maguire, PD

AU - Graham, W G

AU - Mariotti, D

PY - 2013

Y1 - 2013

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AB - 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.

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