Large-Scale Preparation of Ordered Titania Nanorods with Enhanced Photocatalytic Activity

Abstract

A titania layer with ordered nanostructures is expected to be of high photocatalytic activity due mainly to its high specific surface area. In the present work, large-area films with ordered titania nanorods were deposited on titanium substrates through a solution approach. The nanorods, with the phase composition of a mixture of anatase and rutile, grew on top of a condensed anatase interlayer along mainly the rutile [001]-axis. The photocatalytic activity was evaluated by decomposing rhodamine B in water and compared with the general sol-gel derived titania films and a commercial DP-25 titania coating. It is found that the as-deposited titania nanorods exhibited extremely high initial photocatalytic activity but declined to a poor value after the consumption of beneficial oxidative peroxo complexes coordinated to Ti(IV). A subsequent thermal treatment eliminated such complexes but at the same time improved the crystallinity of the titania nanorods. The photocatalytic activity of the thermally treated titania nanorods was stable and significantly higher than that of the sol-gel derived film and commercial DP-25 coating.

Effects of a hybrid micro/nanorod topography-modified titanium implant on adhesion and osteogenic differentiation in rat bone marrow mesenchymal stem cells

“…[8][9][10][11] In previous studies, a type of nanorod structure with a phase composition of anatase and rutile has been fabricated on a titanium surface using different chemical processes. [12][13][14] However, biofunctionalization of the nanorod structure has not been evaluated. Because the structure of the nanorod is similar to that of hydroxyapatite crystals, we were interested in investigating the response of osteogenic cells to nanorod topography.…”

Synthesis and Growth Mechanism of Net-like Titanate Nanowire Films via Low-temperature and Low-alkali-concentration Route

“…It is well known that the exposure of Ti foil to H 2 O 2 solution will lead to the formation of titanium peroxide gel Ti(OH) 2 O 2 on Ti substrate [25]. Such a Tiperoxy gel can be decomposed into amorphous hydrate titania TiO 2 · nH 2 O layer [25,26]. In the absence of H 2 O 2 , the reaction between Ti and H 2 O can also lead to the formation of a very thin passivation layer: Ti+3H 2 O=TiO 2 ·H 2 O+2H 2 .…”

“…6 [25,26]. Secondly, the presence of NaOH in the mixed solution may dissolve the hydrated titania layer to form NaHTiO 3 which is then converted to titanate via a condensation reaction (step (b) in Fig.…”

Biofunctionalization of a titanium surface with a nano-sawtooth structure regulates the behavior of rat bone marrow mesenchymal stem cells

“…16 Additionally, other studies have shown that several nanoscale structures can be produced when the titanium surface is treated with H 2 O 2 alone or synergistically under different conditions. [17][18][19] In our experiments, we prepared two size-controllable sawtooth-like nanostructures on titanium surfaces by incubation with H 2 O 2 for different time periods as part of our continuous efforts to fabricate such surfaces. These fabricated nano-sawtooth structures represent two nanosurfaces with similar appearances but different dimensions.…”