Exploring a new phenomenon in the bactericidal response of TiO2 thin films by Fe doping: Exerting the antimicrobial activity even after stoppage of illumination

Structure and photocatalytic activity of a low band gap donor–acceptor–donor (D–A–D) type conjugated polymer: poly(EDOT–pyridazine–EDOT)

“…28 When the polymer absorbs visible light, it produces an electron (e À ) that transfers to the conduction band of the Fe ions; this will lead to an enhancement in charge separation and the formation of hydroxyl and hyperoxide radicals (O 2 c À , cOH). Accordingly, a high amount of radicals (O 2 c À , cOH) leads to the polymer having a higher degradation efficiency for dyes under visible light.…”

Evaluation of surface energy state distribution and bulk defect concentration in DSSC photoanodes based on Sn, Fe, and Cu doped TiO2

“…This higher concentration of trapped holes causes free electrons trapped at many sub -energy states Fe 2+ , Fe 4+ etc conduction band to be easily excited to the Ti 4+ conduction band causing higher absorbance [5,14,18]. At 1 ms delay (Fig.…”

“…Significant improvements have been achieved by tailoring the bulk/surface defect concentrations and band gap energies with controlled amounts of different impurities. On the one hand, illuminated semiconductor oxides in photocatalytic processes can attain a state of high concentration of interfacial charges and enhance the charge exchange between the oxide surface and an electron donor/acceptor molecules in proximity, thus facilitating the desired chemical processes [1,2], such as water splitting [3] and photocatalytic degradation of environmental pollutants [4,5]. On the other hand, semiconductor oxides with appropriate bulk defects will act as charge traps to free charges and prevent electron-hole recombination that enhances charge transport within the oxide [6,7] and are thus used as oxide layers in photovoltaics such as dye-sensitized solar cells (DSSC) for sunlight to current conversion [8].…”

On structure and methylene blue degradation activity of an Aurivillius-type photocatalyst of Bi4V2O11 nanoparticles

“…Semiconductors with photocatalytic activities driven by UV-vis light have been widely investigated [1][2][3][4][5][6][7][8][9][10]. Optical absorption energy is decided by band gap, which is followed by the release of holes and electrons from valence (VB) and conduction (CB) bands, respectively.…”