NDLI: Shape preserving chemical transformation of ZnO mesostructures into anatase TiO<sub>2</sub> mesostructures for optoelectronic applications

Content Provider	Royal Society of Chemistry (RSC)
Author	Game, Onkar Ogale, Satishchandra B. Yengantiwar, Ashish Muduli, Subas Dhas, Vivek
Copyright Year	2011
Abstract	In this work we report on the synthesis of various ZnO mesostructures (rods, spheres, flakes and flower-like morphologies) by hydrothermal and co-precipitation methods and their remarkable and complete transformation into anatase TiO2 mesostructures with nominally similar shapes using controlled low temperature TiCl4 treatment. Various techniques are used to demonstrate the phase purity and morphology details. Based on the careful examination of the transformation of ZnO rods into TiO2 tubes we suggest a mechanism which embodies initial formation of a thin TiO2 shell on the ZnO surface by ion exchange (Ti4+–Zn2+) followed by Zn diffusion through the shell and its oxidation on the surface. We used these converted TiO2 mesostructures for light harvesting in Dye Sensitized Solar Cells (DSSCs) to enhance the conversion efficiency. It is shown that DSSCs made using a doctor bladed film of TiO2 nanoparticles with an overlayer of TiCl4 treated ZnO flowers yield a solar cell efficiency of 6.9% which is considerably higher than that with only TiO2 nanoparticle film (5.4%) of comparable thickness.
Starting Page	2835
Ending Page	2839
Page Count	5
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	4
Issue Number	8
Journal	Energy & Environmental Science
DOI	10.1039/c1ee01515j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Zn Hydrothermal synthesis Coprecipitation Anatase Titanium tetrachloride Ion Diffusion Overlayer Solar cell Nanoparticle
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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