Bismuth vanadate/graphene quantum dot: A new nanocomposite for photoelectrochemical determination of dopamine

Author(s)

Prado, Thiago M. ^[1] ; Carrico, Amanda ^[1] ; Cincotto, Fernando H. ^{[2, 1]} ; Fatibello-Filho, Orlando ^[1] ; Moraes, Fernando C. ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Chem, Sao Carlos, SP - Brazil

^[2] Univ Fed Rio de Janeiro, Inst Chem, Rio De Janeiro, RJ - Brazil

• Document type: Journal article
• Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 285, p. 248-253, APR 15 2019.
• Web of Science Citations: 6

Abstract

A photoelectrochemical sensor for dopamine was fabricated by the immobilization of bismuth vanadate (BiVO4) and graphene quantum dots on a fluorine-doped tin oxide (FTO) glass electrode. Electrochemical impedance spectroscopy experiments demonstrated that the presence of graphene quantum dots contributed to the decrease in charge transfer resistance of the sensor under irradiation of visible light in the presence of dopamine. The photocurrent signals obtained were proportional to the dopamine concentration from 3.6 x 10(-8) to 2.5 x 10(-4) mol L-1, with a detection limit estimated at 8.2 x 10(-9) mol L-1 and a limit of quantification at 2.7 x 10(-8) mol L-1. (AU)

• FAPESP's process: 16/12926-3 - Removal and real time determination of environmental pollutants using electrochemical photoassisted system
• Grantee: Fernando Cruz de Moraes
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants