On the Development of Optical Properties during Thermal Coarsening of Gold Nanoparticle Composites

King, SR; Gentle, AR; Cortie, MB; McDonagh, AM

On the Development of Optical Properties during Thermal Coarsening of Gold Nanoparticle Composites

King, SR

Gentle, AR

Cortie, MB

McDonagh, AM

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Publication Type:: Journal Article
Citation:: Journal of Physical Chemistry C, 2018, 122 (22), pp. 12098 - 12105
Issue Date:: 2018-06-07

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Field	Value	Language
dc.contributor.author	King, SR https://orcid.org/0000-0002-4501-1841	en_US
dc.contributor.author	Gentle, AR https://orcid.org/0000-0001-8964-0722	en_US
dc.contributor.author	Cortie, MB https://orcid.org/0000-0003-3202-6398	en_US
dc.contributor.author	McDonagh, AM https://orcid.org/0000-0002-9502-1175	en_US
dc.date.available	2020-05-25T19:24:26Z
dc.date.issued	2018-06-07	en_US
dc.identifier.citation	Journal of Physical Chemistry C, 2018, 122 (22), pp. 12098 - 12105	en_US
dc.identifier.issn	1932-7447	en_US
dc.identifier.uri	http://hdl.handle.net/10453/125474
dc.description.abstract	© 2018 American Chemical Society. The changes in optical properties that occur as gold nanoparticles (AuNPs) are thermally converted to a continuous thin film were studied with the purpose of determining the roles of particle coarsening and temperature. In situ reflectance spectroscopy, electron microscopy, and synchrotron X-ray diffraction (XRD) were applied to provide complementary information on the changes in particle size and shape. The AuNPs studied were stabilized with 1-butanethiol, 1-octanethiol, oleylamine (OA), or 4-(pyren-1-yl)butane-1-thiol (PyBuSH). Initially, the films were dark brown or purple because of the plasmon resonance of the AuNPs. As the temperature was increased, the AuNPs started to coalesce and percolate, thereby changing the color of the films to that of bulk gold. Films of AuNPs stabilized with alkanethiols sintered very rapidly, measured as a rapid change in the reflectance spectrum. In contrast, films of AuNPs stabilized with OA or PyBuSH sintered more gradually and at a higher temperature. This permitted the transition to be studied in greater detail than for the alkanethiols. Red-shifted plasmon peaks and increased intensity in the reflectance data and XRD and electron microscopy measurements revealed that a prolonged process of nanoparticle coarsening occurred prior to sintering. The effect of temperature on the optical properties was isolated by monitoring samples as they cooled. The insulator-to-metal transition in these types of composites offers a very flexible platform for controlling spectral properties in the near-infrared region.	en_US
dc.relation.ispartof	Journal of Physical Chemistry C	en_US
dc.relation.isbasedon	10.1021/acs.jpcc.8b02744	en_US
dc.subject.classification	Physical Chemistry	en_US
dc.title	On the Development of Optical Properties during Thermal Coarsening of Gold Nanoparticle Composites	en_US
dc.type	Journal Article
utslib.citation.volume	22	en_US
utslib.citation.volume	122	en_US
utslib.for	1007 Nanotechnology	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	03 Chemical Sciences	en_US
utslib.for	09 Engineering	en_US
utslib.for	10 Technology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	open_access
pubs.issue	22	en_US
pubs.publication-status	Published	en_US
pubs.volume	122	en_US

Abstract:

© 2018 American Chemical Society. The changes in optical properties that occur as gold nanoparticles (AuNPs) are thermally converted to a continuous thin film were studied with the purpose of determining the roles of particle coarsening and temperature. In situ reflectance spectroscopy, electron microscopy, and synchrotron X-ray diffraction (XRD) were applied to provide complementary information on the changes in particle size and shape. The AuNPs studied were stabilized with 1-butanethiol, 1-octanethiol, oleylamine (OA), or 4-(pyren-1-yl)butane-1-thiol (PyBuSH). Initially, the films were dark brown or purple because of the plasmon resonance of the AuNPs. As the temperature was increased, the AuNPs started to coalesce and percolate, thereby changing the color of the films to that of bulk gold. Films of AuNPs stabilized with alkanethiols sintered very rapidly, measured as a rapid change in the reflectance spectrum. In contrast, films of AuNPs stabilized with OA or PyBuSH sintered more gradually and at a higher temperature. This permitted the transition to be studied in greater detail than for the alkanethiols. Red-shifted plasmon peaks and increased intensity in the reflectance data and XRD and electron microscopy measurements revealed that a prolonged process of nanoparticle coarsening occurred prior to sintering. The effect of temperature on the optical properties was isolated by monitoring samples as they cooled. The insulator-to-metal transition in these types of composites offers a very flexible platform for controlling spectral properties in the near-infrared region.

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http://hdl.handle.net/10453/125474