Synthesis of Au/SnO{sub 2} core-shell structure nanoparticles by a microwave-assisted method and their optical properties

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.11.009· OSTI ID:21504044

Yu, Yeon-Tae ^[1]; Dutta, Prabir ^[2]

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1. Division of Advanced Materials Engineering, College of Engineering, Chonbuk National University, Jeonju 561-756 (Korea, Republic of)
2. Department of Chemistry, Ohio State University, Columbus, OH 43210 (United States)

Au/SnO{sub 2} core-shell structure nanoparticles were synthesized using the microwave hydrothermal method. The optical and morphological properties of these particles were examined and compared with those obtained by the conventional hydrothermal method. In microwave preparation, the peak position of the UV-visible plasmon absorption band of Au nanoparticles was red-shifted from 520 to 543 nm, due to the formation of an SnO{sub 2} shell. An SnO{sub 2} shell formation was complete within 5 min. The thickness of the SnO{sub 2} shell was 10-12 nm, and the primary particle size of SnO{sub 2} crystallites was 3-5 nm. For the core-shell particles prepared by a conventional hydrothermal method, the shell formed over the entire synthesis period and was not as crystalline as those produced, using the microwave method. The relationship between the morphological and spectroscopic properties and the crystallinity of the SnO{sub 2} shell are discussed. -- Graphical abstract: In microwave preparation, the peak position of UV-visible absorption band of Au nanoparticles was red-shifted from 520 to 543 nm, due to the formation of an SnO{sub 2} shell with high crystallinity. Display Omitted Research highlights: > Au/SnO{sub 2} core-shell structure NPs were synthesized by the microwave-assisted method. > The peak position of an SP band of Au/SnO{sub 2} colloid was red-shifted till 543 nm. > The particles size of an SnO{sub 2} in the shell layer was 3-5 nm. > The crystallinity of an SnO{sub 2} shell was increased by the microwave hydrothermal reaction.

• OSTI ID: 21504044
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 2; Other Information: DOI: 10.1016/j.jssc.2010.11.009; PII: S0022-4596(10)00515-3; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

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