Titania encapsulation of flat gold nanoparticles — A simple route to Au@TiO2 core-shell nanosheets
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Abstract
We report the attachment of a uniform coating of a thin layer of amorphous TiO 2 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 TiO 2 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@TiO 2 nanosheets were characterized by TEM, EDX, and SAED.Key words: core-shell, titanium dioxide, anisotropic nanoparticles, semiconductor thin films, nanocomposite material.
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