Enhanced electrochemical response of carbon quantum dot modified electrodes

TALANTA

卷:178

Article

Algarra, M.¹  Gonzalez-Calabuig, A.²  Radotic, K.³  Mutavdzic, D.³  Ania, C. O.⁴  Lazaro-Martinez, J. M.⁵  Jimenez-Jimenez, J.¹  Rodriguez-Castellon, E.¹  del Valle, M.² 

[1] Univ Malaga, Dept Quim Inorgan, Fac Ciencias, Campus Teatinos S-N, E-29071 Malaga, Spain

[2] Univ Autonoma Barcelona, Sensors & Biosensors Grp, Chem Dept, E-08193 Barcelona, Spain

[3] Univ Belgrade, Inst Multidisciplinary Res, Kneza Viseslava 1, Belgrade 11000, Serbia

[4] Univ Orleans, CEMHTI, UFR 3079, CNRS, F-45071 Orleans, France

[5] Univ Buenos Aires, IQUIFIB CONICET, Fac Farm & Bioquim, Dept Quim Organ, Junin 956, RA-1113 Buenos Aires, DF, Argentina

关键词: Modified electrode;    Voltanunetry;    Carbon dot;    Nanomaterial;   

DOI  :  10.1016/j.talanta.2017.09.082

来源: Elsevier

【 摘 要 】

A glassy carbon electrode (GCE) was surface-modified with carbon quantum dots (CQDs) and applied for the effective enhancement of the electrochemical signal for dopamine and uric acid determination. CQDs were prepared from graphite by a green modification of the Hummers method. They were characterized by FTIR-ATR, XPS, solid-state NMR, fluorescence and Raman spectroscopies. TPD-MS analysis was applied to characterize the functionalization of the surface. The CQDs were assembled on the glassy carbon electrode by adsorption because of the large number of carboxy groups on their surface warrants effective adsorption. The modified GCE exhibits a sensitivity that is almost 10 times better than of the bare GCE. The lower limits of detection are 1.3 mu M for uric acid and 2.7 mu M for dopamine.

【 授权许可】

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