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Renewable Surface Carbon‐composite Electrode Bulk Modified with GQD‐RuCl 3 Nano‐composite for High Sensitive Detection of l ‐tyrosine
Author(s) -
Habibi Esmaeil,
Heidari Hassan
Publication year - 2016
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201600010
Subject(s) - cyclic voltammetry , chemistry , fourier transform infrared spectroscopy , graphene , graphene quantum dot , detection limit , electrode , electrochemistry , composite number , differential pulse voltammetry , amperometry , electrochemical gas sensor , materials science , nuclear chemistry , chemical engineering , nanotechnology , chromatography , composite material , engineering
The ability to analytically detect l ‐tyrosine is a clinical necessity not only for the diagnosis of some diseases such as tyrosinemia, but also for the study on various tyrosine‐associated disorders. In here, graphene quantum dot (GQD) was synthesized by carbonization of citric acid and used to prepare GQD‐RuCl 3 nano‐composite. GQD and GQD‐RuCl 3 were characterized by Fourier transform infrared (FTIR) and Transmission electron microscopy (TEM). Next the nano‐composite was modified with carbon‐composite electrode (CCE) and the electrochemical properties of GQD‐RuCl 3 |CCE were studied by cyclic voltammetry (CV). This bulk modified electrode showed good electrocatalytic activity for l ‐tyrosine oxidation. The values of the detection limit and sensitivity were obtained as 0.23 µM and 90 nA/µM. The results indicated that the synergistic incorporation of RuCl 3 with GQD conspicuously promotes the sensitivity of the sensor. Moreover, the sensor showed long‐term stability and good selectivity towards the detection of l ‐tyrosine.