Surface hydrophilic–hydrophobic property on transparent mesoporous silica thin films containing chromium oxide single-site photocatalyst

Single-site and nano-confined photocatalysts designed in porous materials for environmental uses and solar fuels

“…We carried out the design of tetrahedral Ti-containing mesoporous silica thin film s (TiMSF) on a quartz glass substrate via a spin-coating method. 21,[150][151][152][153][154] The TiMSF shows unique surface wettability in water contact angle measurem ents. The water contact angles on the pure m esoporous silica thin film s (MSF) were 20-301 ( Fig.…”

Synthesis and the effect of calcination temperature on the physical–chemical properties and photocatalytic activities of Ni,La codoped SrTiO3

“…It is known that La 3+ has nearly the same ionic radius (0.115 nm) as Sr 2+ (0.113 nm) and can replace Sr 2+ in SrTiO 3 without producing a large lattice strain. Besides the photoresponse, the photocatalytic activity is also strongly affected by many other physical-chemical properties, such as particle size [27], crystal form [28,29], initial adsorption rate for substrate [30,31], surface area [32,33] and surface properties [34,35], which are changed remarkably according to different preparation and/or treatment procedure, during which the calcination temperature is the key factor in determining the above-mentioned.…”

Applications of Single-site Photocatalysts to the Design of Unique Surface Functional Materials

“…The design of single-site photocatalyst-containing mesoporous silica thin film anchored on transparent supports or embedded onto transparent materials would provide one of the most promising and efficient photocatalytic and surface photofunctional systems [8]. Recently the single-site photocatalyst (Ti, V, Cr, Mo, and W ions)-containing transparent mesoporous silica thin films have been prepared on quartz plates by the sol-gel/spin coating method [39][40][41][42][43]. Their local structures around the metal oxide moieties as well as photo-induced surface properties have been investigated.…”

“…Recently our research group has found that these singlesite photocatalysts can be used not only to promote the photocatalytic reaction but also to design the surface functional materials; nano-sized metal, alloy and binary oxide and hydrophilic transparent mesoporous thin film [33][34][35][36][37][38][39][40][41][42][43]. In this review, our recent applications of singlesite photocatalysts to the synthesis of the nano-sized metal catalysts, the visible-light sensitive binary oxide photocatalysts and the transparent mesoporous thin films as surface photo-functional materials are introduced.…”

“…This surface property can be kept for 2-3 days after the stopping of UV-light irradiation. These observations indicate that Me(Ti, V, Cr, Mo and W)-containing mesoporous thin films can perform the super-hydrophilic property under UV-light irradiation as well as TiO 2 thin film[8,[39][40][41][42][43].In the case of Cr-MS thin film, the water contact angle becomes smaller even after visible-light irradiation, indicating that Cr-MS thin film can perform not only under UV-light irradiation but also under visible-light irradiation. The charge transfer excited state of the tetra-Ti-oxide, tetra-Mo-oxide and tetra-W-oxide moieties formed under UV-light irradiation play a significant role in the photoinduced super-hydrophilic property.…”