Incorporation of dopants into the lattice of ZnO nanoparticles to control photoactivity

Preparation, Characterization and Photocatalytic Activity of ZnO and Mn Doped ZnO Nanoparticles

“…24 Some researchers have reported that doping of ZnO with Mn increases the photocatalytic activity upto 2 mol% under UV irradiation while some others have reported opposite results. [25][26][27] Barick et al 28 synthesized pure and doped ZnO nanoclusters and compared their photocatalytic activity for the degradation of MB dye under UV light. They found pure ZnO to be a better photocatalyst as compared to transition metal doped ZnO.…”

Effects of undoped and manganese-doped zinc oxide nanoparticles on the colour fading of dyed polyester fabrics

“…The photoactivity of both titanium dioxide [19,20] and zinc oxide [10] has been decreased by doping with manganese. Dyed polyester fabrics were treated with acrylic polymer containing ZnO doped with 3 atomic % of manganese ions.…”

“…These ions are believed to reduce the photoactivity of nanoparticles by acting as trap centre sites for recombination of the electrons and positive holes produced by UV radiation, before they can migrate onto the particle surface and generate ROS. For manganese-doped ZnO, however, studies involving channelling-enhanced microanalysis have shown that all the manganese ions are not fully incorporated on the zinc sublattice in ZnO nanoparticles [10]. In this case, some of the manganese ions may be located at or near to the surface.…”

“…The influence of ROS arising from the ZnO in the surface coatings will be described. The photo activity of ZnO can be reduced by doping with a transition metal [10]. Results will be presented on the effect of doping ZnO with manganese ions in reducing the UV fading of the dyes.…”

A review of critical factors for assessing the dermal absorption of metal oxide nanoparticles from sunscreens applied to humans, and a research strategy to address current deficiencies

“…However, the relationship between photocatalytic and physical properties is complex (Chen and Mao 2007;Yin et al 2015). Activity also depends on, and can be controlled by, surface coatings (Carlotti et al 2009;Hong et al 2006) and dopants in the crystalline lattice (Casey et al 2006;Wakefield et al 2004). The free radicals produced by TiO 2 and ZnO nanoparticles in the presence of UV can damage DNA in cells in vitro (Dunford et al 1997;Tiano et al 2010;reviewed by Newman et al (2009) and Osmond and McCall (2010).…”