Structural modification and property tailoring in titania for high efficiency in sunlight

Photoactive Titania Float for Disinfection of Water; Evaluation of Cell Damage by Bioanalytical Techniques

“…The advantage of this can offer high surface area for better adsorption and photoreaction. Retention of anatase phase is confirmed by the two SEM images . Figure represents the optical absorption spectra of the two catalysts.…”

“…Narrowing can cause a significant decrease in photoredox potential energy of the semiconductor. But the improved photon absorption capacity due to lower band energy that can respond to visible light or enhanced rate of generated charge carriers can overcome this negative effect to cause enough enhancement in overall reaction unlike the UV irradiated experiments which did not show much of a difference in catalytic activity with Nd doping as per our published work elsewhere .…”

“…Doping induces a very small peak at 360 nm in optical absorption spectra of Fig. , indicating the gain of (intrinsic semiconductor behavior) electronic structure similar to nano TiO 2 sample with an absorption edge at 390 nm (indicated by an arrow) . The results necessitate the measurement of actual absorption edge, bandgap and midbands by the appropriate diffuse reflectance spectra in further studies.…”

“…The enhanced bactericidal efficiency of doped TiO 2 may clearly be attributed to the increased range of light absorption due to the substitutional impurity Nd in TiO 2 . Although the changes in cell volume and optical spectral results tend to indicate the Nd to be a substitutional impurity, the chance of Nd 2 O 3 being dispersed on the TiO 2 surface or between the interface of agglomerates as crystallites of Nd 2 O 3 along with substitution cannot be ruled out . The incorporation of Nd into TiO 2 lattice results in an efficient separation of charge carriers and band gap narrowing.…”

Gel-combustion-synthesized ZnO nanoparticles for visible light-assisted photocatalytic hydrogen generation

“…Since the ZnO NPs' size is very much greater than the Bohr exciton radius, the apparent blue-shift and the reduced particle size (45 nm) can be credited to the fuel rather than quantum confinement [46]. The band gap reduction in semiconductors can happen by way of doping [47][48][49] or fast crystallization process like microwave irradiation [50]. However, in the present study the band gap reduction happened in an undoped semiconductor prepared by combustion reaction.…”