TiO2 / SiO2 nanocomposites were synthesized by DC reactive magnetron cosputtering technique using different O2 : Ar gas mixing ratios. The structural and spectroscopic characteristics of the synthesized samples were introduced using x-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy, energy-dispersive x-ray spectroscopy, and UV-visible spectroscopy. The XRD results revealed that all nanocomposite samples were polycrystalline. The functional groups of these samples were identified by FTIR. The UV-visible spectra of these samples showed an absorption edge at 450 nm. The results of photodegradation of organic and water pollutants under UV irradiation suggest that the photocatalytic activity of TiO2 / SiO2 nanocomposite is highly improved as compared with that of TiO2 nanophotocatalyst.
The CRD technique has been successfully applied in various environments since it directly provides the frequency-dependent absorption strengths of the medium under study. As mirrors with a sufficiently high reflectivity, detectors with a sufficiently fast time response, and tunable (pulsed) light sources are available, there is no intrinsic limitation to the spectral region in which CRD can be applied. In this work, cavity-ring down (CRD) technique was employed to stabilize the absorption of a cell filled with ammonia gas to 120μs pulses from a 904nm GaAlAsP semiconductor laser.
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