Journal
NANOTECHNOLOGY
Volume 30, Issue 6, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/aaf17e
Keywords
morphology; texture; charged organosilane; titania
Funding
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- FAPERGS (Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul)
- CAPES (Coordenacao de Aperfeicoamento Pessoal de Nivel Superior)
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Anatase nanotubes with high surface area (ca. 350 m(2) g(-1)), containing gold nanoparticles, were successfully obtained from trititanate nanotubes, prepared by a template-free hydrothermal method, and calcined at 450 degrees C. The high surface area and tubular morphology were attained due to the presence of ionic silsesquioxane, which acts as anti-sintering agent for titania during calcination process, by forming a thin silica coating between anatase nanotubes. Additionally, the ionic silsesquioxane also acts as stabilizing and adhesion agent for gold nanoparticles on the surface of anatase nanotubes. The influence of the ionic silsesquioxane on the morphological and textural properties of anatase nanotubes was studied in three different moments during the synthesis: before, after and before/after nanotubes were rolled up. The photocatalytic activity of the nanotube samples was evaluated by hydrogen generation showing remarkable enhancement in hydrogen production and stability of catalyst when compare with the bare anatase sample and commercial P-25.
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