Dodd, AaronMcKinley, AllanTsuzuki, TakuyaSaunders, Martin2015-12-070254-0584http://hdl.handle.net/1885/25315The successful use of nanoparticulate ZnO in applications such as UV-screening agents or photocatalyst for the destruction of chemical waste requires the development of techniques for controlling its photocatalytic activity. In this study, we have investigated transition metal doping as a means of achieving this goal. Powders of ZnO, MnxZn1-xO, and CoxZn1-xO were synthesised by a three-stage process consisting of high-energy mechanical milling, heat treatment, and washing. The photocatalytic activity of these powders was evaluated using the spin-trapping technique with electron paramagnetic resonance spectroscopy. It was found that the photocatalytic activity of CoxZn1-xO progressively decreased with the doping level. In contrast, the activity of MnxZn1-xO initially increased with doping up to a level of 2 mol% and thereafter declined. These results demonstrate that doping with transition metal oxides can be used to tailor the photocatalytic properties of nanoparticulate ZnO. � 2008 Elsevier B.V. All rights reserved.Keywords: Crystals; Electric conductivity; Manganese; Manganese compounds; Mechanical alloying; Metal refining; Metallic compounds; Milling (machining); Oxides; Paramagnetic resonance; Paramagnetism; Photocatalysis; Powder metals; Powders; Semiconducting zinc compo Chemical synthesis; Oxides; Semiconductors200910.1016/j.matchemphys.2008.09.0412016-02-24