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Enhanced photocatalytic activity under visible light in N-doped TiO2 thin films produced by APCVD preparations using t-butylamine as a nitrogen source and their potential for antibacterial films

Paper ID Volume ID Publish Year Pages File Format Full-Text
28071 44058 2009 10 PDF Available
Title
Enhanced photocatalytic activity under visible light in N-doped TiO2 thin films produced by APCVD preparations using t-butylamine as a nitrogen source and their potential for antibacterial films
Abstract

Atmospheric pressure chemical vapour deposition (APCVD) of N-doped titania thin films has been achieved from titanium (IV) chloride, ethyl acetate and t-butylamine at a deposition temperature of 500 °C and the films characterised by XRD, Raman spectroscopy, XPS, SEM, UV–visible–NIR spectroscopy, contact angle measurements and stearic acid degradation. The films were compared to two industrial self-cleaning products: Activ™ and BIOCLEAN™ and shown to be significantly better in both photocatalysis and superhydrophilicity, two preferential properties of effective self-cleaning coatings. X-ray diffraction showed the films have the anatase TiO2 structure. High resolution X-ray photoelectron spectroscopy was consistent with small quantities of nitrogen (0.15–0.7 at.%) occupying an interstitial site (N 1s ionisation at ∼400 eV). This work sheds light on the current confusion within the literature as to the role of nitrogen in the enhancement of the photocatalytic properties of thin films with direct evidence that selective doping at the interstitial site (ionisation ∼400 eV by XPS) has a pronounced effect on enhancing photocatalysis. Surprisingly in the majority of films no XPS peak for N for O substitution was observed (ionisation ∼396 eV by XPS). This is to our knowledge the first example of an N-doped titania film with only interstitial doping. These films showed significant photocatalysis with visible light. The best films were tested for their antimicrobial properties and found to be an effective agent for the destruction of Escherichia coli using lighting conditions commonly found in UK hospitals.

Keywords
Photocatalysis; N-TiO2; Visible light
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Enhanced photocatalytic activity under visible light in N-doped TiO2 thin films produced by APCVD preparations using t-butylamine as a nitrogen source and their potential for antibacterial films
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 207, Issues 2–3, 25 September 2009, Pages 244–253
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Any Questions? feel free to contact us