Electrophoretic deposition of Au nanocrystals inside perpendicular mesochannels of TiO2

Mehul N. Patel, Ryan D. Williams, R. Alan May, Hiroshi Uchida, Keith J. Stevenson, Keith P. Johnston

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Au nanocrystals stabilized by dodecanethiol were deposited into 100-150 nm thick TiO2 films with evenly spaced perpendicular nanopillars and mesochannels on the order of 10 nm supported on conducting ITO/glass electrodes. Electrophoretic deposition was used to enhance nanocrystal deposition within the mesoporous TiO2 film. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with energy-dispersive X-ray (EDX), UV-vis spectroscopy, variable-angle spectroscopic ellipsometry (VASE), and scanning surface potential microscopy (SSPM) were used to characterize the resulting Au nanocrystal/TiO2 composites. Au nanocrystal loadings reached 21 wt % and were not kinetically limited at 10 min, relative to depositions performed for 20 h. Both VASE measurements of the anisotropy of the imaginary refractive index, k, and X-ray photoelectron spectroscopy (XPS) depth profiling studies indicate that Au nanocrystals are dispersed within the vertically aligned mesopores and distributed throughout the film. The mean penetration depth of a single nanocrystal penetrating inside the film is described with a model in terms of the electric field and a local deposition rate constant, which is influenced by ligand binding and architecture on the nanocrystal surface.

Original languageEnglish
Pages (from-to)6029-6040
Number of pages12
JournalChemistry of Materials
Volume20
Issue number19
DOIs
Publication statusPublished - 14 Oct 2008
Externally publishedYes

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