Remarkable fluorescence enhancement of upconversion composite film and its application on mercury sensing

To achieve a stable, sensitive, and high-efficiency biological probe, a novel NaYF4：Yb,Er nanocrystals/TiO2 inverse opal composite film was designed by self-assembly and solvent evaporation methods. 32-fold enhanced upconversion（UC） emission was investigated under 980 nm excitation. According to siz...

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Bibliographic Details
Published inJournal of rare earths Vol. 35; no. 5; pp. 460 - 467
Main Author 徐赛 张艳秋 李香萍 张金苏 孙佳石 程丽红 陈宝玖
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2017
Subjects
composite film
mercury detection
rare earths
solid biosensor
upconversion enhancement
solid biosensor
composite film
mercury detection
upconversion enhancement
rare earths
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(17)60934-7

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Summary:To achieve a stable, sensitive, and high-efficiency biological probe, a novel NaYF4：Yb,Er nanocrystals/TiO2 inverse opal composite film was designed by self-assembly and solvent evaporation methods. 32-fold enhanced upconversion（UC） emission was investigated under 980 nm excitation. According to size-dependency, excitation power density-dependency as well as photonic stop band（PSB）-dependency upconversion spectra, the enhancement mechanism of the composite film was put down to the stochastical diffraction of IOPCs multi-layered structure to the excitation laser. On the basis of the enhancement effect of the composite film, energy transfer between upconversion nanoparticles（UCNPs） and quantum dots（QDs）, and the sensitive sensing of CdTe QDs on mercury, the UC composite film was used for sensing of Hg^2＋ in serum. The solid sensor as a mercury detector owns lots of superiorities such as feasible operation, good linear relationship（R=0.997）, low limit of detection（70.5 nmol/L） and thus may have broad prospects in the biosensing field.
Bibliography:11-2788/TF
To achieve a stable, sensitive, and high-efficiency biological probe, a novel NaYF4：Yb,Er nanocrystals/TiO2 inverse opal composite film was designed by self-assembly and solvent evaporation methods. 32-fold enhanced upconversion（UC） emission was investigated under 980 nm excitation. According to size-dependency, excitation power density-dependency as well as photonic stop band（PSB）-dependency upconversion spectra, the enhancement mechanism of the composite film was put down to the stochastical diffraction of IOPCs multi-layered structure to the excitation laser. On the basis of the enhancement effect of the composite film, energy transfer between upconversion nanoparticles（UCNPs） and quantum dots（QDs）, and the sensitive sensing of CdTe QDs on mercury, the UC composite film was used for sensing of Hg^2＋ in serum. The solid sensor as a mercury detector owns lots of superiorities such as feasible operation, good linear relationship（R=0.997）, low limit of detection（70.5 nmol/L） and thus may have broad prospects in the biosensing field.
mercury excitation dependency layered assembly evaporation CdTe inverse luminescence photonic
XU Sai 1,2, ZHANG Yanqiu 1, LI Xiangping 1, ZHANG Jinsu1, SUN Jiashi1,CHENG Lihong1, CHEN Baojiu （1. Department of Physics, Dalian Maritime University, Dalian 116026, China; 2. Transportation Equipment ＆ Ocean Engineering College, Dalian Maritime University, Dah？m 116026, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60934-7