Upconversion photoluminescent metal ion sensors via two photon absorption in graphene oxide quantum dots

被引：53

作者：

Ha, Hyun Dong ^{[1
,2
]}

Jang, Min-Ho ^{[3
,4
]}

Liu, Fei ^{[1
,2
]}

Cho, Yong-Hoon ^{[3
,4
]}

Seo, Tae Seok ^{[1
,2
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, BK21 Program, Taejon 305701, South Korea

[2] Korea Adv Inst Sci & Technol, Inst BioCentury, Taejon 305701, South Korea

[3] Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea

[4] Korea Adv Inst Sci & Technol, Graphene Res Ctr KI NanoCentury, Taejon 305701, South Korea

来源：

CARBON | 2015年 / 81卷

基金：

新加坡国家研究基金会;

关键词：

ENERGY-TRANSFER; VISIBLE-LIGHT; ANTI-STOKES; IN-VIVO; LUMINESCENCE; SIZE; NANOPARTICLES; NANOCRYSTALS; FLUORESCENCE; TEMPERATURE;

D O I：

10.1016/j.carbon.2014.09.069

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In-depth study on upconversion photoluminescence (UCPL) of graphene oxide quantum dots (GOQDs) was presented. Uniform GOQDs with a single-layer and a circular shape within 4 nm diameter were fabricated by acidic exfoliation from the graphite nanoparticles. The green UCPL of the GOQDs at similar to 563 nm was observed by a femto-second (fs) Ti:sapphire pulsed laser (lambda(ex):800 nm), and the mechanism of the observed UCPL was systemically characterized. We further utilized the UCPL of GOQD as an optical biosensor for detecting aptamer-based metal ions with high sensitivity and selectivity, and verified that the fluorescence quenching of the UCPL GOQDs was mediated by the electron transfer between the GOQD and the captured metal ion rather than fluorescence energy transfer. The understanding of the UCPL of graphene quantum dots would enhance their applicability in the biosensing and bioimaging research fields. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：367 / 375

页数：9

共 48 条

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