Reactive Facets Covered Mosaic Spheres of Anatase TiO₂ and Related Pseudo-Isotropic Effect

Abstract

Pseudo-isotropic mosaic spheres of anatase almost completely covered with reactive (001) facets are prepared via a one-pot reaction. The growth process is mediated by an appropriate amount of NaF under hydrothermal conditions. Due to the large exposure ratio of identical (001) facets, the product can serve as an ideal model to investigate certain crystalline plane effects owing to their pseudo-isotropic properties, such as texture effects. Intensified X-ray diffraction results are presented to show such effects induced by morphology.

Anatase TiO2microspheres with reactive {001} facets for improved photocatalytic activity

“…15 Thereafter, a large number of studies have been conducted towards the preparation of different shaped anatase TiO 2 micro-or nanocrystals with exposed {001} facets. 11,12,[16][17][18][19][20][21][22][23][24][25][26][27][28][29] For example, Murray et al, synthesized small and thin anatase TiO 2 nanocrystals using a standard air-free Schlenk line technique under nitrogen atmosphere. 23 Kang et al, compared the morphological differences between anatase microcrystals synthesized from TiF 4 and TiCl 3 .…”

Photocatalytic Surface-Initiated Polymerization on TiO2 toward Well-Defined Composite Nanostructures

“…In this method, water plays an important role in crystallizing amorphous TiO 2 by dissolving and recrystallizing randomly distributed TiO 6 2– octahedra via a dissolution–precipitation process, which leads to formation of mesoporous titania structures with loosely packed grains . The presence of F – not only suppresses the formation of brookite and rutile, leaving only anatase phase, but also promotes crystallite growth by adsorbing on the surface of TiO 2 particles and enhances the crystallization degree of the anatase. , …”

Recent Progress in Hydrothermal Synthesis of Zinc Oxide Nanomaterials

“…For some of these materials, such as TiO 2 , SnO 2 , CeO 2 , and In 2 O 3 , doping and ternary alloys [29,35,42,44] have been demonstrated. Practical applications, such as lithium storage [36,37,39,41,45,47,48], sensors [22,34,40,46], catalysts [23] and photocatalysts [24,26,27,31,32,35,38,42], solar cells [33], phosphors [29], etc., have been reported. However, ZnO remains the most commonly studied material in terms of growth procedures and material properties, as well as practical applications.…”