Titania encapsulation of flat gold nanoparticles — A simple route to Au@TiO2 core-shell nanosheets

Autor:	J. T. Banks, J Ian McKelvey, Laura A Richard, Jeffrey J McDowell
Rok vydání:	2008
Předmět:	Core shell Coating Chemistry Colloidal gold Organic Chemistry Thin layer engineering Variable thickness Nanotechnology General Chemistry engineering.material Catalysis Amorphous solid
Zdroj:	Canadian Journal of Chemistry. 86:703-708
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v08-064
Popis:	We report the attachment of a uniform coating of a thin layer of amorphous TiO2 to flat gold nanoparticles via a simple sol–gel process. Coatings of variable thickness ranging from 5 to 100 nm have been produced. Activation of the Au particles was unnecessary. However, the ability to coat the flat gold nanoparticles was dependent on the method used for their synthesis. In addition, the amorphous TiO2 shell was hydrothermally treated to induce crystallization to the anatase polymorph. The desired nanocrystalline anatase morphology was obtained by heating in water at 70 °C for 1 week. A similar result was also obtained when the material was heated to 130 °C for 5 min in a microwave reactor. These new Au@TiO2 nanosheets were characterized by TEM, EDX, and SAED.Key words: core-shell, titanium dioxide, anisotropic nanoparticles, semiconductor thin films, nanocomposite material.
Databáze:	OpenAIRE
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