Kwan H Cheng, Jacob Aijmo, Lun Ma, Mingzhen Yao, Xing Zhang, John Como, Louisa J Hope-Weeks, Juyang Huang, Wei Chen
We have studied the luminescence decay and trace biomaterials detection potential of two surface-functionalized nanoparticles, poly(ethylene glycol) bis(carboxymethyl) ether-coated LaF(3):Ce,Tb (~20 nm) and thioglycolic acid-coated ZnS/Mn (~5 nm). Upon UV excitation, these nanoparticles emitted fluorescence peaking at 540 and 597 nm, respectively, in solution. Fluorescence imaging revealed that these nanoparticles targeted the trace biomaterials from fingerprints that were deposited on various nonporous solid substrates...
October 22, 2008: Journal of Physical Chemistry. C, Nanomaterials and Interfaces