Size and Shape Control of Nanocrystallites in Mesoporous TiO2 Films

Neale, Nathan R.; Frank, Arthur J.

doi:10.1039/b700885f

Title: Size and Shape Control of Nanocrystallites in Mesoporous TiO2 Films

Journal Article · Mon Jan 01 00:00:00 EST 2007 · Journal of Materials Chemistry

DOI:https://doi.org/10.1039/b700885f· OSTI ID:915659

; Frank, Arthur J.

We investigated the influences of the titania precursor chemistry and hydrothermal temperature in the sol-gel procedure on the growth of TiO2 nanocrystallites. The nanocrystallites were prepared either from Ti(OiPr)4 (OiPr = isopropoxide) in acetic acid solution or from Ti(OiPr)3(OAc) (OAc = acetate) in water followed by nitric acid acidification. Nanocrystallites formed from the first method were 20-40% larger than those produced from the second method. The average size of calcined TiO2 nanocrystallites formed from Ti(OiPr)4 varied from 16-36 nm over the hydrothermal temperature range of 180-300 degrees C, while the average size of those prepared from Ti(OiPr)3(OAc) varied from 13-23 nm over temperatures of 200-250 degrees C. Significantly, the size of the crystallites displayed a linear dependence on the hydrothermal temperature. Crystal growth in acetic acid was enhanced in the [001] direction with increased autoclave temperature, whereas crystallites formed in the presence of nitric acid grew less rapidly in the [001] direction. The mechanisms for the preferential growth direction of the nanocrystals are discussed.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 915659

Report Number(s):: NREL/JA-270-41146; JMACEP; MainId:63196; UUID:db26dea7-f4d4-e411-b769-d89d67132a6d; MainAdminId:45270; TRN: US200816%%130

Journal Information:: Journal of Materials Chemistry, Vol. 17, Issue 2007; ISSN 0959-9428

Country of Publication:: United States

Language:: English

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MATERIALS SCIENCE
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Title: Size and Shape Control of Nanocrystallites in Mesoporous TiO2 Films

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