The investigation of rare earth-doped nanomaterials in various hosts.
Ng, Chun Leen.
Date of Issue2010
School of Chemical and Biomedical Engineering
This work investigates the synthesis of bifunctional nanomaterials using the doping of paramagnetic GdF3 and GdPO4, and weakly paramagnetic CaYF5 nanoparticles with Yb3+ and Er3+, via a hydrothermal synthesis method. The nanoparticles produced were investigated for fluorescent properties that were both up- and down-converting in nature, while also prepared for further characterisation of their magnetic and structural properties. GdF3 nanoparticles were used as a provider of magnetic properties while Yb3+ and Er3+ ions were used to provide fluorescence. Despite the strong fluorescence that was expected of the Yb3+, Er3+ ions, significant characteristic peaks were not observed from the emission spectra of the CaYF5:(Yb, Er) samples, possibly because of fluorescence quenching due to Ca. A reasonably good degree of fluorescence was observed for the GdF3:(Yb, Er) samples, but not all samples were well dispersed in hexane.
Final Year Project (FYP)
Nanyang Technological University