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Pristine graphene quantum dots for detection of copper ions

Published online by Cambridge University Press:  25 July 2014

Xiaofeng Liu ,
Wei Gao ,
Xuemei Zhou  and
Yuanyuan Ma
Xiaofeng Liu
Affiliation:
Center for Applied Chemical Research, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
Wei Gao
Affiliation:
Center for Applied Chemical Research, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
Xuemei Zhou
Affiliation:
Center for Applied Chemical Research, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
Yuanyuan Ma*
Affiliation:
Center for Applied Chemical Research, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
*
a)Address all correspondence to this author. e-mail: yyma@mail.xjtu.edu.cn
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Abstract

To selectively detect Cu2+ ions is very important for controlling daily intake of Cu2+ ions and monitoring numerous biological processes. Fluorescence spectroscopic technique is a useful one for detection of copper ions. Previous methods always involve the use of metal Cd-based quantum dots (QDs), which suffer to the photobleaching and subsequent release of toxic metal ions. Herein, a simple method has been developed to detect Cu2+ ions by using pristine graphene QDs. Graphene QDs are synthesized by chemical oxidation of pitch graphite fibers. Our results indicate the photoluminescence (PL) of as-synthesized graphene QDs could be quenched by a group of metal ions while adding biothiol cysteine can only cause the significant recovery of the PL of graphene QDs quenched by Cu2+ ions. Our approach provides an easy and environmental friendly method for detection of Cu2+ ions and has the potential for future practical applications.

Keywords

graphene quantum dotsphotoluminescencechemical sensorcopper ion
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 13 , 14 July 2014 , pp. 1401 - 1407
Copyright
Copyright © Materials Research Society 2014 

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References

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