Metal oxide thin films and nanostructures for self-cleaning applications: current status and future prospectsMamidipudi Ghanashyam Krishna, Madhurima Vinjanampati and Debarun Dhar PurkayasthaEur. Phys. J. Appl. Phys., 62 3 (2013) 30001DOI: https://doi.org/10.1051/epjap/2013130048