Hydrothermal growth of photoelectrochemically active titanium dioxide cauliflower-like nanostructures

Sachin A. Pawar, R. S. Devan, D. S. Patil, V. V. Burungale, T. S. Bhat, S. S. Mali, S. W. Shin, J. E. Ae, C. K. Hong, Y. R. Ma, J. H. Kim, P. S. Patil

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38 Scopus citations

Abstract

Hierarchical titanium dioxide nanostructures have been synthesized by a simple and cost-effective hydrothermal deposition method onto the conducting glass substrates. In order to study the effect of titanium tetrachloride precursor quantity on the growth of TiO2; the thin films of TiO 2 have been synthesized with the variations in the TiCl4 from 0.4 mL to 1.0 mL at the interval of 0.2 mL. These films are characterized for their optical, structural, compositional, morphological properties using UV-vis spectrophotometer, Photoluminescence, X-ray Diffraction, High resolution transmission electron microscopy, X-ray Photoelectron Spectroscopy and Field Emission Scanning Electron Microscopy techniques. The optical band gap energy is found to increase from 2.74 to 3.06 eV with the increase in TiCl4 quantities exhibiting a blue shift. XRD patterns show the formation of polycrystalline TiO2 with the tetragonal crystal structure possessing rutile phase. Rise in the TiCl4 quantity leads to the decrease in the particle size. The chemical composition and valence states of the constituent elements were analysed by XPS. FESEM images showed the formation of cauliflower-like structure at the highest TiCl4 precursor quantity. The films were photoelectrochemically active with the maximum current density of 202 μA/cm2 for the sample prepared at 1.0 mL.

Original languageEnglish (US)
Pages (from-to)470-479
Number of pages10
JournalElectrochimica Acta
Volume117
DOIs
StatePublished - Jan 20 2014

Bibliographical note

Funding Information:
One of the authors SAP wishes to acknowledge the UGC-SAP-DSA-I, New Delhi and Department of Science and Technology (DST) INDIA for financial support through DST-PURSE scheme. This work is partially supported by the Human Resource Development of the Korea Institute of Energy technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of knowledge Economy (No. 20124010203180). DSP wishes to acknowledge the DST, New Delhi, INDIA.

Keywords

  • HRTEM
  • TiO
  • XPS
  • cauliflower-like nanostructures
  • hydrothermal
  • solar cell

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