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| Determination of Copper Ion by Electroche? miluminescence Using Graphene Quantum Dots Doped with Nitrogen and Sulfur |
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| DOI： |
| KeyWord:nitrogen and sulfur co-doped graphene quantum dots（N,S－GQDs） electrochemilumi? nescence（ECL） copper ion determination |
| Author | Institution |
| WANG Qi，LI Chao，ZHANG Zhao-xiang |
Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science，MOE;Shandong Key Laboratory of Biochemical Analysis;College of Chemistry and Molecular Engineering，Qingdao University of Science and Technology，Qingdao ，China |
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| Abstract: |
| Graphene quantum dots（GQDs）are a new kind of carbon nanomaterials. GQDs display many merits such as low toxicity，rich surface grafting and have been widely concerned. In this paper，nitrogen and sulfur co-doped graphene quantum dots（N，S－GQDs）were prepared. Compared with undoped GQDs，the electrochemical luminescence（ECL）signal of N，S－GQDs was significantly enhanced. N，S－GQDs were adsorbed on the surface of the working electrode by using chitosan（CS）as a linking agent，and a new type of N，S－GQDs ECL sensor was constructed. Under the action of external voltage，N，S－GQDs transition from the ground state to the excited state，and release light energy in the process of returning to the ground state. After Cu2+ was added，Cu2+ specifically coordinated with groups on the surface of the N，S－GQDs to form ag? gregates，which reduced the N，S－GQDs that could be excited and manifested as the quenching of ECL sig? nals. The higher the concentration of Cu2+ ，the greater the quenching degree. The quantitative detection of Cu2+ could be realized by detecting the change of ECL signal. Under the optimal conditions，the change of ECL intensity showed a good linear relationship with Cu2+ concentration from 0. 01 to 35 μmol/L and the detec? tion limit was calculated to be 1. 7 nmol/L. This research provided a way for the rapid detection of heavy metal ions in actual samples and broadened the application of nanomaterials in the field of ECL sensing |
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