Scanning tunneling microscopy/spectroscopy of titanium dioxide nanoparticulate film on Au(1 1 1) surface

Datar, Suwarna ; Madhu Kumar, P. ; Sastry, Murali ; Dharmadhikari, C. V. (2004) Scanning tunneling microscopy/spectroscopy of titanium dioxide nanoparticulate film on Au(1 1 1) surface Colloids and Surfaces A: Physicochemical and Engineering Aspects, 232 (1). pp. 11-17. ISSN 0927-7757

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.colsurfa.2003.10.002

Abstract

Scanning tunneling microscopy (STM)/scanning tunneling spectroscopy (STS) of titanium dioxide nanoparticulate film on Au(1 1 1) surface is carried out yielding topography, I-V, dI/dV versus V and normalized dI/dV versus V. Isolated nanoparticles were found to exhibit semiconducting behavior with a band gap which varies from 1 to > 3.0 eV depending on the nature of substrate/nanoparticle/tip junction formation. Increase in the particulate density resulted into change in tunneling behavior from semiconducting to metallic as characterized by decrease in non-linearity in I-V curves and increase in average tunneling conductance. The results are discussed in terms of presence of adsorbed complexes on defect structure of TiO2 surface for low coverage and availability of additional transport paths between the particles at high coverage.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Scanning Tunneling Microscopy (STM); Titanium Oxide; Nanostructures
ID Code:47147
Deposited On:06 Jul 2011 14:18
Last Modified:06 Jul 2011 14:18

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