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Extracting structural information of Au colloids at ultra-dilute concentrations: identification of growth during nanoparticle immobilization

Extracting structural information of Au colloids at ultra-dilute concentrations: identification of growth during nanoparticle immobilization
Extracting structural information of Au colloids at ultra-dilute concentrations: identification of growth during nanoparticle immobilization
Sol-immobilization is increasingly used to achieve supported metal nanoparticles (NPs) with controllable size and shape; it affords a high degree of control of the metal particle size and yields a narrow particle size distribution. Using state-of-the-art beamlines, we demonstrate how X-ray absorption fine structure (XAFS) techniques are now able to provide accurate structural information on nano-sized colloidal Au solutions at μM concentrations. This study demonstrates: (i) the size of Au colloids can be accurately tuned by adjusting the temperature of reduction, (ii) Au concentration, from 50 μM to 1000 μM, has little influence on the average size of colloidal Au NPs in solution and (iii) the immobilization step is responsible for significant growth in Au particle size, which is further exacerbated at increased Au concentrations. The work presented demonstrates that an increased understanding of the primary steps in sol-immobilization allows improved optimization of materials for catalytic applications.
Tierney, George F.
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Decarolis, Donato
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Abdullah, Norli
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Rogers, Scott M.
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Hayama, Shusaku
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Briceno de Gutierrez, Martha
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Villa, Alberto
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Catlow, C. Richard A.
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Collier, Paul
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Dimitratos, Nikolaos
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Wells, Peter P.
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Tierney, George F.
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Decarolis, Donato
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Abdullah, Norli
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Rogers, Scott M.
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Hayama, Shusaku
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Briceno de Gutierrez, Martha
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Villa, Alberto
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Catlow, C. Richard A.
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Collier, Paul
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Dimitratos, Nikolaos
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Wells, Peter P.
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Tierney, George F., Decarolis, Donato, Abdullah, Norli, Rogers, Scott M., Hayama, Shusaku, Briceno de Gutierrez, Martha, Villa, Alberto, Catlow, C. Richard A., Collier, Paul, Dimitratos, Nikolaos and Wells, Peter P. (2019) Extracting structural information of Au colloids at ultra-dilute concentrations: identification of growth during nanoparticle immobilization. Nanoscale Advances. (doi:10.1039/C9NA00159J).

Record type: Article

Abstract

Sol-immobilization is increasingly used to achieve supported metal nanoparticles (NPs) with controllable size and shape; it affords a high degree of control of the metal particle size and yields a narrow particle size distribution. Using state-of-the-art beamlines, we demonstrate how X-ray absorption fine structure (XAFS) techniques are now able to provide accurate structural information on nano-sized colloidal Au solutions at μM concentrations. This study demonstrates: (i) the size of Au colloids can be accurately tuned by adjusting the temperature of reduction, (ii) Au concentration, from 50 μM to 1000 μM, has little influence on the average size of colloidal Au NPs in solution and (iii) the immobilization step is responsible for significant growth in Au particle size, which is further exacerbated at increased Au concentrations. The work presented demonstrates that an increased understanding of the primary steps in sol-immobilization allows improved optimization of materials for catalytic applications.

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Accepted/In Press date: 11 May 2019
e-pub ahead of print date: 21 May 2019

Identifiers

Local EPrints ID: 431242
URI: http://eprints.soton.ac.uk/id/eprint/431242
PURE UUID: 8c5fea3f-efee-405e-b41c-fd332a34c58b
ORCID for Peter P. Wells: ORCID iD orcid.org/0000-0002-0859-9172

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Date deposited: 28 May 2019 16:30
Last modified: 07 Oct 2020 01:51

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Contributors

Author: George F. Tierney
Author: Donato Decarolis
Author: Norli Abdullah
Author: Scott M. Rogers
Author: Shusaku Hayama
Author: Martha Briceno de Gutierrez
Author: Alberto Villa
Author: C. Richard A. Catlow
Author: Paul Collier
Author: Nikolaos Dimitratos
Author: Peter P. Wells ORCID iD

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