Design of nanoporous titania-supported methylene blue molecules for efficient singlet oxygen generation under red light exposure

Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Iori Yamada, Ryota Ikeda, Shinya Nagata, Masaya Kakuta, Motohiro TagayaAbstractThe methylene blue (MB) adsorption states on the titania nanoparticles (NPs) prepared by two surfactant removal processes were investigated to demonstrate the singlet oxygen generation efficiency. The NPs with the BET surface areas of 250–350 m2/g exhibited the spherical particle sizes of 100–150 nm, indicating the nanoporous structures. The MB molecular states adsorbed on the NPs prepared by solvent extraction method (WT) were attributed to both the monomer and dimer states, whereas those on the NPs prepared by the baking at 250 °C (BT) were dominantly attributed to the monomer state, indicating the adsorbed states would be affected by the surface functional groups. The singlet oxygen generation efficiency from the MB adsorbed on the BT NPs were higher than that on the WT NPs, and those of the NPs were higher as compared with that the MB alone. Therefore, the generation efficiency would be controlled by the titania surface condition.

Source: Colloids and Interface Science Communications - April 29, 2019 Category: Nanotechnology Source Type: research