Graphene Nanosheets and Quantum Dots: A Smart Material for Electrochemical Applications

Author(s)

Cincotto, Fernando Henrique ^[1] ; Moraes, Fernando Cruz ^[1] ; Spinola Machado, Sergio Antonio ^[1]

Affiliation

^[1] Univ Sao Paulo, Grp Electrochem Mat & Electroanalyt Methods, Inst Chem Sao Carlos, Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: CHEMISTRY-A EUROPEAN JOURNAL; v. 20, n. 16, p. 4746-4753, APR 14 2014.
• Web of Science Citations: 13

Abstract

A novel material for the electrochemical determination of endocrine disruptors using a composite based on graphene oxide modified with cadmium telluride quantum dots has been evaluated. The morphology, structure and electrochemical performance of the composite electrodes were characterised by transmission electron microscopy, dynamic light scattering, UV-visible absorption spectra, fluorescence spectra, Raman spectra and cyclic voltammetry. The dynamic light scattering, transmission electronic microscopy and spectrophotometric measurements all showed good distribution of the quantum dots with a small particle size. The electrochemical measurements demonstrated the high performance of the composite response in the presence of a light source. Differential pulse voltammetry allowed the development of a method to determine 17-estradiol levels in the range from 0.2 to 4.0molL(-1) with a detection limit of 2.8nmolL(-1) (0.76gL(-1)). (AU)

• FAPESP's process: 12/18339-1 - Detection of endocrine disruptors testosterone and estradiol in environmental samples utilizing modified electrodes with graphene, the gold nanoparticles and quantum dots.
• Grantee: Fernando Henrique Cincotto
• Support Opportunities: Scholarships in Brazil - Doctorate