Issue 4, 2011

Synthesis of recrystallized anatase TiO2 mesocrystals with Wulff shape assisted by oriented attachment

Abstract

In this work, we describe a kinetically controlled crystallization process assisted by an oriented attachment (OA) mechanism based on a nonaqueous sol–gel synthetic method (specifically, the reaction of titanium(IV) chloride (TiCl4) with n-octanol) to prepare re-crystallized anatase TiO2 mesocrystals (single crystal). The kinetics study revealed a multi-step and hierarchical process controlled by OA, and a high resolution transmission electron microscopy (HRTEM) analysis clearly shows that the synthesized mesocrystal presents a truncated bipyramidal Wulff shape, indicating that its surface is dominated by {101} facets. This shape is developed during the recrystallization step. The material developed here displayed superior photocatalytic activity under visible light irradiation compared to TiO2–P25 as a benchmarking.

Graphical abstract: Synthesis of recrystallized anatase TiO2 mesocrystals with Wulff shape assisted by oriented attachment

Supplementary files

Article information

Article type
Paper
Submitted
22 Dec 2010
Accepted
16 Feb 2011
First published
18 Mar 2011

Nanoscale, 2011,3, 1910-1916

Synthesis of recrystallized anatase TiO2 mesocrystals with Wulff shape assisted by oriented attachment

R. O. Da Silva, R. H. Gonçalves, D. G. Stroppa, A. J. Ramirez and E. R. Leite, Nanoscale, 2011, 3, 1910 DOI: 10.1039/C0NR01016B

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