“…Etgar et al synthesized hierarchical nanostructure of γ-Fe 2 O 3 and PbSe nanoparticles for potential biological detection 247 . Choi et al synthesized bifunctional nanocomposites consisting of silicacoated magnetic cores and surface-anchored luminescent lanthanide irons 5,217,231,233,239 . Photoluminescence was dramatically enhance because of a ligand-to-metal energy transfer between 2,2'-bipyridine-4,4'-dicarboxylic acid (BDA) and Ln metal ion.…”