This
work focuses on the formation of Ir3+ dopants in
the host TiO2 matrix to decrease the band gap energy and
a built-in electric field at the interface between Ir0 and
TiO2. X-ray diffraction results show that the anatase percentage
is increased from 70 to 90% with increasing Ir doping concentration
using the hydrothermal procedures at 200 °C for 24 h. X-ray photoelectron
spectroscopy results demonstrate that the binding energies of Ti4+ (Ti 2p1/2 and Ti 2p3/2) shift slightly
positively after Ir doping. The influence of Ir doping on the photoelectrochemical
and optical properties of anatase/rutile TiO2 is characterized
by linear sweep voltammetry and photoluminescence spectroscopy. These
results suggest that the photoinduced electron–hole pair recombination
rate is decreased in the presence of the Ir dopant. Outstanding H2 evolution reaction efficiencies of 48 and 23.5 μmol·h–1·g–1 with apparent quantum
efficiency values of approximately 15.7 and 4.5% determined at 365
and 420 nm, respectively, are achieved with the 1.0% Ir/TiO2 specimen in photocatalytic systems to enhance hydrogen evolution.
Heterostructures containing CdMnTe-diluted magnetic semiconductor quantum wells are proposed as magneto-optic layers (MOL) for high-resolution Faraday microscopy at low temperature. The Faraday rotation is enhanced up to 54.4 deg T-1 by embedding the quantum wells in a semiconductor-metal optical cavity. These MOL allowed the observation of the intermediate state pattern in a superconductor layer with spatial and magnetic resolutions of 1 mu m and 10 mT, respectively
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