Shape preserving chemical transformation of ZnO mesostructures into anatase TiO2 mesostructures for optoelectronic application

Patent metadata

Field	Value
Publication number	US-9290392-B2
Application number	US-201213486509-A
Country	US
Kind code	B2
Filing date	Jun 1, 2012
Priority date	Aug 5, 2011
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

The present application discloses a shape preserving chemical transformation of ZnO mesostructures into anatase TiO 2 mesostructures using controlled low temperature TiCl 4 treatment for optoelectronic applications.

First claim

We claim:

1. A process for the shape preserving chemical transformation of ZnO mesostructures into anatase TiO 2 mesostructures comprising the steps of:
i. treating the Zinc oxide mesostructures with Titanium tetrachloride (TiCl 4 ) solution at temperature in the range of 60 to 70° C. for period in the range of 20 to 30 min;
ii. annealing the TiCl 4 treated Zinc oxide mesostructures as obtained in step (i) at a temperature in the range of 400 to 450° C. for period in the range of 20 to 30 min to obtain anatase TiO 2 mesostructures.

2. The process of claim 1 , wherein the Zinc oxide mesostructures are selected from the group consisting of Zinc oxide rods, Zinc oxide spheres, Zinc oxide flakes and Zinc oxide flowers.

3. The process of claim 1 , wherein the Zinc oxide mesostructures are coated over Titanium dioxide nanoparticles film and annealed at a temperature in the range of 400 to 450° C. for 50 to 60 min before treating with Titanium tetrachloride (TiCl 4 ) solution.

4. The process of claim 1 , wherein the Zinc oxide mesostructures are optionally grown on Fluorine doped Tin oxide (FTO) or Indium doped Tin oxide (ITO) glass plates before treating with Titanium tetrachloride (TiCl 4 ) solution.

5. The process of claim 4 , wherein the Zinc oxide mesostructures treated with Titanium tetrachloride (TiCl 4 ) solution are washed with deionized water.

6. The process as claimed in claim 1 , wherein the thickness of anatase TiO 2 mesostructures is in the range of 5-12 μm.

7. The process as claimed in claim 1 , wherein the diameter of anatase TiO 2 mesostructure is ranging from 500 nm to 2 μm.

8. Anatase Titanium dioxide mesostructures prepared by the process of claim 1 .

9. Anatase Titanium dioxide mesostructures as claimed in claim 8 , wherein said mesostructures are useful for optoelectronic applications.

10. Anatase Titanium dioxide mesostructures as claimed in claim 8 , wherein dye sensitized solar cells utilizing said mesostructures exhibit efficiency in the range of 3.5% to 7%.

Assignees

• Muduli Subas K
• Dhas Vivek V
• Game Onkar S
• Yengantiwar Ashish P
• Ogale Satishchandra B
• Council Scient Ind Res

Inventors

• Muduli Subas K
• Dhas Vivek V
• Game Onkar S
• Yengantiwar Ashish P
• Ogale Satishchandra B

Classifications

• C01G9/02

  Oxides; Hydroxides · CPC title

• C01P2002/30

  Three-dimensional structures · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01P2004/03

  obtained by SEM · CPC title