Synthesis and characterization of a mixed phase of anatase TiO2 and TiO2(B) by low pressure chemical vapour deposition (LPCVD) for high photocatalytic activity

Electron Microscopy and Analysis Group Conference 2013

Chimupala, Y.^1 ; Hyett, G.^2 ; Simpson, R.^1 ; Brydson, R.^1

Institute of Materials Research, SPEME, University of Leeds, LS2 9JT Leeds, United Kingdom^1

Department of Chemistry, University of Southampton, SO17 1BJ Highfield, Southampton, United Kingdom^2

关键词: Carrier gas flow rates;    High photocatalytic activities;    Low pressure chemical vapour depositions;    Photocatalytic activities;    Preferred orientations;    Synthesis and characterizations;    Synthesized materials;    Titanium Isopropoxide;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/522/1/012074/pdf
DOI  :  10.1088/1742-6596/522/1/012074

来源: IOP

【 摘 要 】

This project is concerned with enhancing photocatalytic activity by preparing a mixed phase of nano-sized TiO2. TiO2thin films were synthesized by using Low Pressure Chemical Vapour Deposition (LPCVD). Titanium isopropoxide and N2gas were used as the precursor and carrier gas respectively. The effects of reaction temperature, carrier gas flow rate and deposited area were studied. TiO2thin films with nano-sized TiO2particles 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 TiO2was 600°C with a 1 mL/s N2flow rate.