Tailoring of electron diffusion through TiO2 nanowires

Rajan, Jose and M. M., Yusoff (2012) Tailoring of electron diffusion through TiO2 nanowires. In: International Conference on Nanotechnology - Research and Commercialization (ICONT 2011), 6-9 June 2011 , Sabah. pp. 5-25., 1502 (1). ISSN 0094243X ISBN 978-073541119-7

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Abstract

Charge transport through a random network of onedimensional TiO2 nanostructures such as nanorods, nanowires, and nanofibers developed by electrospinning technique has been studied in the presence of an electrolyte by electrochemical impedance spectroscopy and transient photocurrent measurements. The results have been compared with the charge transport parameters of random TiO2 nanoparticle (25 nm) network. The charge transport was discussed under the framework of hopping transport. Continuous nanofibers had longer charge collecting times and short nanorods have enhanced scattering losses. The TiO2 films containing random network of nanowires of aspect ratio 10:1 can have an order of magnitude higher diffusion coefficient than other morphologies. Furthermore, charge transport through Nb-doped anatase TiO2 nanofibers was studied. It was observed that the Fermi level of TiO2 rise close to its conduction band and result in a band-edge type diffusion mechanism even at low bias voltages when 2 wt% Nb atoms replaces the Ti atoms in the anatase lattice. The Nb-doped anatase electrospun nanofibers showed high chemical capacitance, high effective diffusion coefficient, and lower transport resistance compared to the undoped samples and conventional nanoparticles.

Item Type: Conference or Workshop Item (Lecture)
Additional Information: Indexed by Scopus, WOS
Uncontrolled Keywords: Anatase; Charge transport; Diffusivity; Electro; Spinning; Fermi level; Nanowires
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 13 Feb 2020 07:05
Last Modified: 13 Feb 2020 07:05
URI: http://umpir.ump.edu.my/id/eprint/26736
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