resumo
We report synthesis, characterization and covalent fabrication of graphene nanosheets (GR) on Au electrode. The GR nanosheets were characterized by XRD, Raman spectroscopy, FESEM and TEM techniques. The GR nanosheets were functionalized by reduction of aryldiazonium salt (Cl- N-2(+)-Ph-COOH) to produce GR-Ph-COOH. In another step, Au electrode was modified by cysteamine (Cyst) to form Au-S-CH2-CH2-NH2 surface. Finally, GR-Ph-COOH was covalently attached to Au-S-CH2-CH2-NH2 by carbodiimide chemistry. The GR-Cyst-Au interface was used for electrochemical determination of resorcinol (RS) in ionic liquid [C(4)mim] [Cl] system over a concentration range from 0.3 to 45.2 mu M with a detection limit (LOD) of 0.02 mu M. The faster electron transfers kinetics of RS in [C-4 mim] [Cl] system was attributed to synergetic effects of GR nanosheets and [C-4 mim] [Cl] medium. The GR-Cyst-Au interface was successfully applied for determination of RS in Garnier hair-color cream as a real sample analysis. Computational quantum approach i.e. COSMO-RS model was also used to study trend of interactions in a ternary mixture of water, RS and [C-4 mim] [Cl] system for proposed RS sensor. (C) 2018 The Electrochemical Society.
palavras-chave
GLASSY-CARBON ELECTRODE; CAPILLARY-ZONE-ELECTROPHORESIS; VOLTAMMETRIC SENSOR; SENSING PLATFORM; BINARY-MIXTURES; CATECHOL; COMPOSITE; WATER; HYDROQUINONE; CHEMISTRY
categoria
Electrochemistry; Materials Science
autores
Rather, JA; Alsubhi, Z; Khan, I; Khudaish, E; Kannan, P
nossos autores
Imran Khan
Bolseiro de pós-DoutoramentoGrupos
agradecimentos
This project was supported by Sultan Qaboos University grant (IG/SCI/CHEM/16/03). The authors thank central analytical research unit (CAARU), Sultan Qaboos University for SEM and X-ray diffraction measurements. I. K thanks Prof. Joao A. P. Coutinho, CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal for providing the ionic liquid [C