Titanium Dioxide Thin Films Deposited by Electric Field‐Assisted CVD: Effect on Antimicrobial and Photocatalytic Properties^**

Abstract

Thin films of anatase titanium dioxide are deposited on fluorine-doped tin oxide (FTO) glass substrates utilizing the electric field-assisted aerosol (EA)CVD reaction of titanium isopropoxide in toluene at 450°C. The as-deposited films are characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy (RS), and UV-vis spectroscopy. The photoactivity and antibacterial activity of the films are also assessed. The characterization analysis reveals that the use of an electric field affects the film microstructure, its preferential orientation, and the functional properties. XRD of the anatase films reveals that the application of electric fields causes a change in the preferential orientation of the films from (101) to (004) or (211) planes, depending on the strength of the applied field during the deposition.

Aerosol assisted chemical vapour deposition of hydroxyapatite-embedded titanium dioxide composite thin films

“…Figure 4(a) shows the normalised XRD patterns of all deposits; it can be seen that in all samples, TiO2 can be detected, in its anatase form (A). This is in agreement with literature, since deposition with TTIP under these experimental conditions leads to formation of anatase [Romero, 2015]. The data indicate that the presence of HAp NPs does not have an effect on the nature of the deposited compound.…”

Enhanced Bactericidal Activity of Silver Thin Films Deposited via Aerosol-Assisted Chemical Vapor Deposition

“…TiO 2 is a well--known photocatalytic agent that has been extensively used for destroying microorganisms including bacteria, viruses and fungi. 24 These self--sterilising films have potential applications in hospital and other environments where bacterial contamination is problematic, e.g., food processing facilities. Furthermore, the development of metal--modified TiO 2 coatings can enhance the antibacterial activity rendering these films antibacterial even in the dark.…”

ZnO single microwire homojunction light emitting diode grown by electric field assisted chemical vapor deposition

“…Large sized and high density well-aligned ZnO microwires with the length of 1-2 cm are uniformly formed over the entire Si substrate. The role of the electric field in the formation of the p-n junctions may be related to the formation of surface dipoles, which direct the crystal growth via a strong localized electric field as reported for TiO 2 by Naitik Panjawi and Luz Romero et al 23,24 Fig. 3b shows that the segment of the n-type undoped single ZnO MW has a smooth hexagonal crosssectional surface and its diameter is about 30 mm.…”