Mesoporous TiO2 and copper-modified TiO2 nanoparticles: A case study R. Ajay Kumar, V. G. Vasavi Dutt and Ch. Rajesh Eur. Phys. J. Plus, 133 2 (2018) 60 Published online: 16 February 2018 DOI: 10.1140/epjp/i2018-11870-x