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• Journal article
  Kafizas AG, Durrant JR, 2015,

  Transient Absorption Spectroscopy of Anatase and Rutile: the Impact of Morphology and Phase on Photocatalytic Activity

  , The Journal of Physical Chemistry C, ISSN: 1932-7447
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• Journal article
  Sotelo-Vazquez C, Noor N, Kafizas A, Quesada-Cabrera R, Scanlon DO, Taylor A, Durrant JR, Parkin IPet al., 2015,

  Multifunctional P-Doped TiO2 films: a new approach to self-cleaning, transparent conducting oxide materials

  , Chemistry of Materials, Vol: 27, Pages: 3234-3242, ISSN: 1520-5002

  Multifunctional P-doped TiO2 thin films were synthesized by atmospheric pressure chemical vapor deposition (APCVD). This is the first example of P-doped TiO2 films with both P5+ and P3– states, with the relative proportion being determined by synthesis conditions. This technique to control the oxidation state of the impurities presents a new approach to achieve films with both self-cleaning and TCO properties. The origin of electrical conductivity in these materials was correlated to the incorporation of P5+ species, as suggested by Hall Effect probe measurements. The photocatalytic performance of the films was investigated using the model organic pollutant, stearic acid, with films containing predominately P3– states found to be vastly inferior photocatalysts compared to undoped TiO2 films. Transient absorption spectroscopy studies also showed that charge carrier concentrations increased by several orders of magnitude in films containing P5+ species only, whereas photogenerated carrier lifetimes—and thus photocatalytic activity—were severely reduced upon incorporation of P3– species. The results presented here provide important insights on the influence of dopant nature and location within a semiconductor structure. These new P-doped TiO2 films are a breakthrough in the development of multifunctional advanced materials with tuned properties for a wide range of applications.

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• Journal article
  Pendlebury SR, Wang X, Le Formal F, Cornuz M, Kafizas A, Tilley SD, Graetzel M, Durrant JRet al., 2014,

  Ultrafast charge carrier recombination and trapping in hematite photoanodes under applied bias

  , Journal of the American Chemical Society, Vol: 136, Pages: 9854-9857, ISSN: 0002-7863

  Transient absorption spectroscopy on subpicosecond to second time scales is used to investigate photogenerated charge carrier recombination in Si-doped nanostructured hematite (α-Fe2O3) photoanodes as a function of applied bias. For unbiased hematite, this recombination exhibits a 50% decay time of ∼6 ps, ∼103 times faster than that of TiO2 under comparable conditions. Anodic bias significantly retards hematite recombination dynamics, and causes the appearance of electron trapping on ps−μs time scales. These ultrafast recombination dynamics, their retardation by applied bias, and the associated electron trapping are discussed in terms of their implications for efficient water oxidation.

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• Journal article
  Knapp CE, Manzi JA, Kafizas A, Parkin IP, Carmalt CJet al., 2014,

  Aerosol-Assisted Chemical Vapour Deposition of Transparent Zinc Gallate Films

  , CHEMPLUSCHEM, Vol: 79, Pages: 1024-1029, ISSN: 2192-6506
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  • Citations: 13
• Journal article
  Chadwick N, Sathasivam S, Kafizas A, Bawaked SM, Obaid AY, Al-Thabaiti S, Basahel SN, Parkin IP, Carmalt CJet al., 2014,

  Combinatorial aerosol assisted chemical vapour deposition of a photocatalytic mixed SnO2/TiO2 thin film

  , JOURNAL OF MATERIALS CHEMISTRY A, Vol: 2, Pages: 5108-5116, ISSN: 2050-7488
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• Journal article
  Sathasivam S, Kafizas A, Ponja S, Chadwick N, Bhachu DS, Bawaked SM, Obaid AY, Al-Thabaiti S, Basahel SN, Carmalt CJ, Parkin IPet al., 2014,

  Combinatorial Atmospheric Pressure CVD of a Composite TiO₂/SnO₂ Thin Film

  , CHEMICAL VAPOR DEPOSITION, Vol: 20, Pages: 69-79, ISSN: 0948-1907
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  • Citations: 10
• Journal article
  Kafizas A, Noor N, Carmichael P, Scanlon DO, Carmalt CJ, Parkin IPet al., 2014,

  Combinatorial Atmospheric Pressure Chemical Vapor Deposition of F: TiO 2; the Relationship between Photocatalysis and Transparent Conducting Oxide Properties

  , ADVANCED FUNCTIONAL MATERIALS, Vol: 24, Pages: 1758-1771, ISSN: 1616-301X
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  • Citations: 40
• Journal article
  Kafizas A, Carmalt CJ, Parkin IP, 2013,

  CVD and precursor chemistry of transition metal nitrides

  , COORDINATION CHEMISTRY REVIEWS, Vol: 257, Pages: 2073-2119, ISSN: 0010-8545
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  • Citations: 89
• Journal article
  O'Keeffe C, Gannon P, Gilson P, Kafizas A, Parkin IP, Binions Ret al., 2013,

  Air purification by heterogeneous photocatalytic oxidation with multi-doped thin film titanium dioxide

  , THIN SOLID FILMS, Vol: 537, Pages: 131-136, ISSN: 0040-6090
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  • Citations: 9
• Journal article
  Wilkinson M, Kafizas A, Bawaked SM, Obaid AY, Al-Thabaiti SA, Basahel SN, Carmalt CJ, Parkin IPet al., 2013,

  Combinatorial Atmospheric Pressure Chemical Vapor Deposition of Graded TiO₂-VO₂ Mixed-Phase Composites and Their Dual Functional Property as Self-Cleaning and Photochromic Window Coatings

  , ACS COMBINATORIAL SCIENCE, Vol: 15, Pages: 309-319, ISSN: 2156-8952
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  • Citations: 43
• Book chapter
  Parkin IP, Kafizas A, 2013,

  Exothermic Metathesis Reactions

  , Comprehensive Inorganic Chemistry II (Second Edition): From Elements to Applications, Pages: 471-490

  The development of solid-state metathesis (SSM) routes over the last two decades has revolutionized the way in which several industrially important refractory ceramics, intermetallics, and semiconductors are made. In this chapter, the development of SSM routes in synthesizing a range of materials including metal borides and aluminides, carbides and silicides, nitrides, phosphides, arsenides and antimonides, oxides and sulfides, selenides and tellurides is covered. In addition, an overview of the new directions in metathesis is presented, including carbon nanotube and nanocrystal formation. © 2013 Elsevier Ltd. All rights reserved.

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  • Citations: 10
• Journal article
  Uppal MA, Kafizas A, Ewing MB, Parkin IPet al., 2013,

  The room temperature formation of gold nanoparticles from the reaction of cyclohexanone and auric acid; a transition from dendritic particles to compact shapes and nanoplates

  , JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 7351-7359, ISSN: 2050-7488
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  • Citations: 29
• Journal article
  Ponja S, Sathasivam S, Chadwick N, Kafizas A, Bawaked SM, Obaid AY, Al-Thabaiti S, Basahel SN, Parkin IP, Carmalt CJet al., 2013,

  Aerosol assisted chemical vapour deposition of hydrophobic TiO₂-SnO₂ composite film with novel microstructure and enhanced photocatalytic activity

  , JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 6271-6278, ISSN: 2050-7488
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  • Citations: 49
• Journal article
  Kafizas A, Parry SA, Chadwick AV, Carmalt CJ, Parkin IPet al., 2013,

  An EXAFS study on the photo-assisted growth of silver nanoparticles on titanium dioxide thin-films and the identification of their photochromic states

  , PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 15, Pages: 8254-8263, ISSN: 1463-9076
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  • Citations: 15
• Journal article
  Kafizas A, Noor N, Carmalt CJ, Parkin IPet al., 2013,

  TiO₂-based transparent conducting oxides; the search for optimum electrical conductivity using a combinatorial approach

  , JOURNAL OF MATERIALS CHEMISTRY C, Vol: 1, Pages: 6335-6346, ISSN: 2050-7526
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  • Citations: 30
• Journal article
  Kafizas A, Carmalt CJ, Parkin IP, 2012,

  Does a Photocatalytic Synergy in an Anatase-Rutile TiO2 Composite Thin-Film Exist?

  , Chemistry - A European Journal, Vol: 18, Pages: 13048-13048, ISSN: 1521-3765

  It has often been suggested that anatase-rutile mixtures/composites synergistically enhance photocatalysis. However, in the case of dense thin-films containing an intimate mix of both anatase and rutile phases, such an effect has not been observed. In synthesising combinatorial films with graded film thickness and phase, and applying established photocatalytic mapping methods, we were able to assess how dense thin-films of intimately mixed anatase-rutile mixtures affect photocatalytic performance. We found that no photocatalytic synergy between anatase-rutile composites (29≤rutile %≤83) within such dense thin-film systems exists. In fact, an increased presence of rutile caused the photocatalytic activity to fall. This was explained by the unfavourable energetics in the multiple electron transfers required between several neighbouring rutile and anatase sites for the photo-generated electron to reach the material’s surface; encouraging the trapping of electrons within the bulk and increasing the likelihood of charge recombination. The decrease in photocatalytic activity was found to vary linearly with rutile component.

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• Journal article
  Cabrera RQ, Latimer ER, Kafizas A, Blackman CS, Carmalt CJ, Parkin IPet al., 2012,

  Photocatalytic activity of needle-like TiO2/WO3−x thin films prepared by chemical vapour deposition

  , Journal of Photochemistry and Photobiology A, Vol: 239, Pages: 60-60, ISSN: 1010-6030

  The enhanced photocatalyticactivity of needle-like TiO2/WO3−x (0 < x ≤ 0.3) composite thinfilms is demonstrated in the degradation of stearic acid, a model system for the organic pollutants typically present on window surfaces. The films were synthesised by atmospheric pressure chemicalvapourdeposition (APCVD) from reaction of tungsten and titanium chlorides with ethanol and ethyl acetate as oxygen sources, respectively, and characterised by X-ray diffraction, Raman spectroscopy, SEM and AFM. The increase in activity of films is explained in terms of an effective vectorial charge separation at the interface of the two oxide semiconductors. The interaction of water with the surface of the TiO2/WO3−x composite film is also discussed after water droplet contact angle measurements.

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• Journal article
  Crick CR, Bear JC, Kafizas A, Parkin IPet al., 2012,

  Superhydrophobic Photocatalytic Surfaces through Direct Incorporation of Titania Nanoparticles into a Polymer Matrix by Aerosol Assisted Chemical Vapor Deposition

  , Vol: 24, Pages: 3505–3508-3505–3508, ISSN: 1521-4095
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• Journal article
  Dunnill CW, Kafizas A, Parkin IP, 2012,

  CVD Production of Doped Titanium Dioxide Thin Films

  , Chemical Vapor Deposition, Vol: 18, Pages: 89-89, ISSN: 0948-1907
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• Journal article
  Kafizas A, Parkin IP, 2012,

  ChemInform Abstract: Inorganic Thin‐Film Combinatorial Studies for Rapidly Optimizing Functional Properties

  , ChemInform, Vol: 43, ISSN: 0931-7597

  <jats:title>Abstract</jats:title><jats:p>Review: 217 refs.</jats:p>

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