Low-Temperature Synthesis and HRTEM Analysis of Ordered Mesoporous Anatase with Tunable Crystallite Size and Pore Shape
Artikel i vetenskaplig tidskrift, 2011

A new direct synthesis methodology for the preparation of mesoporous titania with hexagonal mesostructure and with walls of tunable crystallinity and crystallite size has been developed. As the crystallites grow they eventually reach a point where they are too big to fit within the pore walls, the mesoorder becomes distorted and is finally lost. It is run at an unprecedented low temperature of 40 degrees C without the need for an autoclave or high-temperature post-treatment procedures and is thus compatible with low temperature stable substrates. High-resolution transmission electron microscopy and electron diffraction reveal that the pore walls of the mesoordered material consists of anatase TiO2 nanoparticles. The method allows for a wide choice of synthesis time during which the anatase crystallites grow slowly within the range of 2-5 nm in size but needs to be kept such that the crystallites have not yet grown too large for them to be coassembled into an ordered mesostructure.

tio2

anatase

high-resolution electron

self-assembly

surface-area rutile

photocatalysis

water

microemulsion

thin-films

metal-oxides

diffraction

formation mechanism

phases

nanocrystalline titania

EISA

mesostructure

molecular-sieves

Författare

Erik Nilsson

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Y. Sakamoto

Osaka Prefecture University

Anders Palmqvist

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 23 11 2781-2785

Ämneskategorier

Kemi

DOI

10.1021/cm103600q