Remarkable fluorescence enhancement of upconversion composite film and its application on mercury sensing
作者： Sai XU , Yanqiu ZHANG , Xiangping LI , Jinsu ZHANG , Jiashi SUN
DOI: 10.1016/S1002-0721(17)60934-7
关键词:
摘要: Abstract To achieve a stable, sensitive, and high-efficiency biological probe, novel NaYF 4 :Yb,Er nanocrystals/TiO 2 inverse opal composite film was designed by self-assembly solvent evaporation methods. 32-fold enhanced upconversion (UC) emission investigated under 980 nm excitation. According to size-dependency, excitation power density-dependency as well photonic stop band (PSB)-dependency spectra, the enhancement mechanism of put down stochastical diffraction IOPCs multi-layered structure laser. On basis effect film, energy transfer between nanoparticles (UCNPs) quantum dots (QDs), sensitive sensing CdTe QDs on mercury, UC used for Hg 2+ in serum. The solid sensor mercury detector owns lots superiorities such feasible operation, good linear relationship ( R =0.997), low limit detection (70.5 nmol/L) thus may have broad prospects biosensing field.
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