Abstract
This project is concerned with enhancing photocatalytic activity by preparing a mixed phase of nano-sized TiO2. TiO2 thin films were synthesized by using Low Pressure Chemical Vapour Deposition (LPCVD). Titanium isopropoxide and N2 gas were used as the precursor and carrier gas respectively. The effects of reaction temperature, carrier gas flow rate and deposited area were studied. TiO2 thin films with nano-sized TiO2 particles were obtained under suitable conditions and SEM, TEM, powder XRD and Raman spectroscopy were employed to characterize the phase and physical appearance of synthesized materials. Preliminary results show that a dual phase (TiO2(B) and anatase) thin film nanopowder was successfully prepared by LPCVD with needle- and polygonal plate-shape crystallites respectively. This thin film deposit produced a preferred orientation of TiO2(B) needles in the [001] direction of average crystallite size 50-80 nm in length and 5-10 nm in width, whilst the crystallite size of anatase polygonal-plates was around 200 nm. The optimal LPCVD condition for preparing this mixed phase of TiO2 was 600°C with a 1 mL/s N2 flow rate.
Highlights
Two of the most important world issues are currently energy consumption and environmental pollution
Preparation procedure for dual phase TiO2 Dual phase TiO2 thin films were prepared by chemical vapour deposition under low pressure at 25 mbar
Titanium tetra-isoproproxide (TTIP, 97%) was used as the chemical vapour precursor and a bubbling chamber settled in an oil bath at 90 C was filled with 5-10 mL TTIP
Summary
Two of the most important world issues are currently energy consumption and environmental pollution. Synthesis (for the first time) dual phase anatase and TiO2(B) thin films for use as a photocatalyst for the water splitting reaction. Preparation procedure for dual phase TiO2 Dual phase TiO2 thin films were prepared by chemical vapour deposition under low pressure at 25 mbar.
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