Rapid Synthesis of Highly Monodisperse Au x Ag 1− x Alloy Nanoparticles via a Half-Seeding Approach

Handle URI:
http://hdl.handle.net/10754/600269
Title:
Rapid Synthesis of Highly Monodisperse Au x Ag 1− x Alloy Nanoparticles via a Half-Seeding Approach
Authors:
Chng, Ting Ting; Polavarapu, Lakshminarayana; Xu, Qing Hua; Ji, Wei; Zeng, Hua Chun
Abstract:
Gold-silver alloy AuxAg1-x is an important class of functional materials promising new applications across a wide array of technological fields. In this paper, we report a fast and facile synthetic protocol for preparation of highly monodisperse AuxAg1-x alloy nanoparticles in the size range of 3-6 nm. The precursors employed in this work are M(I)-alkanethiolates (M = Au and Ag), which can be easily prepared by mixing common chemicals such as HAuCl4 or AgNO3 with alkanethiols at room temperature. In this half-seeding approach, one of the M(I)-alkanethiolates is first heated and reduced in oleylamine solvent, and freshly formed metal clusters will then act as premature seeds on which both the first and second metals (from M(I)-alkanethiolates, M = Au and Ag) can grow accordingly without additional nucleation and thus achieve high monodispersity for product alloy nanoparticles. Unlike in other prevailing methods, both Au and Ag elements present in these solid precursors are in the same monovalent state and have identical supramolecular structures, which may lead to a more homogeneous reduction and complete interdiffusion at elevated reaction temperatures. When the M(I)-alkanethiolates are reduced to metallic forms, the detached alkanethiolate ligands will serve as capping agent to control the growth. More importantly, composition, particle size, and optical properties of AuxAg1-x alloy nanoparticles can be conveniently tuned with this approach. The optical limiting properties of the prepared particles have also been investigated at 532 and 1064 nm using 7 ns laser pulses, which reveals that the as-prepared alloy nanoparticles exhibit outstanding broadband optical limiting properties with low thresholds. © 2011 American Chemical Society.
Citation:
Chng TT, Polavarapu L, Xu Q-H, Ji W, Zeng HC (2011) Rapid Synthesis of Highly Monodisperse Au x Ag 1− x Alloy Nanoparticles via a Half-Seeding Approach . Langmuir 27: 5633–5643. Available: http://dx.doi.org/10.1021/la2005216.
Publisher:
American Chemical Society (ACS)
Journal:
Langmuir
Issue Date:
3-May-2011
DOI:
10.1021/la2005216
PubMed ID:
21462957
Type:
Article
ISSN:
0743-7463; 1520-5827
Sponsors:
The authors gratefully acknowledge the Economic Development Board, Singapore, and King Abdullah University of Science and Technology, Saudi Arabia, for support of this research. T.T.C. would also like to thank the National University of Singapore for providing her a postgraduate scholarship.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorChng, Ting Tingen
dc.contributor.authorPolavarapu, Lakshminarayanaen
dc.contributor.authorXu, Qing Huaen
dc.contributor.authorJi, Weien
dc.contributor.authorZeng, Hua Chunen
dc.date.accessioned2016-02-28T08:00:22Zen
dc.date.available2016-02-28T08:00:22Zen
dc.date.issued2011-05-03en
dc.identifier.citationChng TT, Polavarapu L, Xu Q-H, Ji W, Zeng HC (2011) Rapid Synthesis of Highly Monodisperse Au x Ag 1− x Alloy Nanoparticles via a Half-Seeding Approach . Langmuir 27: 5633–5643. Available: http://dx.doi.org/10.1021/la2005216.en
dc.identifier.issn0743-7463en
dc.identifier.issn1520-5827en
dc.identifier.pmid21462957en
dc.identifier.doi10.1021/la2005216en
dc.identifier.urihttp://hdl.handle.net/10754/600269en
dc.description.abstractGold-silver alloy AuxAg1-x is an important class of functional materials promising new applications across a wide array of technological fields. In this paper, we report a fast and facile synthetic protocol for preparation of highly monodisperse AuxAg1-x alloy nanoparticles in the size range of 3-6 nm. The precursors employed in this work are M(I)-alkanethiolates (M = Au and Ag), which can be easily prepared by mixing common chemicals such as HAuCl4 or AgNO3 with alkanethiols at room temperature. In this half-seeding approach, one of the M(I)-alkanethiolates is first heated and reduced in oleylamine solvent, and freshly formed metal clusters will then act as premature seeds on which both the first and second metals (from M(I)-alkanethiolates, M = Au and Ag) can grow accordingly without additional nucleation and thus achieve high monodispersity for product alloy nanoparticles. Unlike in other prevailing methods, both Au and Ag elements present in these solid precursors are in the same monovalent state and have identical supramolecular structures, which may lead to a more homogeneous reduction and complete interdiffusion at elevated reaction temperatures. When the M(I)-alkanethiolates are reduced to metallic forms, the detached alkanethiolate ligands will serve as capping agent to control the growth. More importantly, composition, particle size, and optical properties of AuxAg1-x alloy nanoparticles can be conveniently tuned with this approach. The optical limiting properties of the prepared particles have also been investigated at 532 and 1064 nm using 7 ns laser pulses, which reveals that the as-prepared alloy nanoparticles exhibit outstanding broadband optical limiting properties with low thresholds. © 2011 American Chemical Society.en
dc.description.sponsorshipThe authors gratefully acknowledge the Economic Development Board, Singapore, and King Abdullah University of Science and Technology, Saudi Arabia, for support of this research. T.T.C. would also like to thank the National University of Singapore for providing her a postgraduate scholarship.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleRapid Synthesis of Highly Monodisperse Au x Ag 1− x Alloy Nanoparticles via a Half-Seeding Approachen
dc.typeArticleen
dc.identifier.journalLangmuiren
dc.contributor.institutionDepartment of Chemistry, Faculty of Science, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singaporeen
dc.contributor.institutionDepartment of Physics, Faculty of Science, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singaporeen
kaust.authorChng, Ting Tingen
kaust.authorZeng, Hua Chunen
kaust.grant.fundedcenterKAUST-NUS GCR Programen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.