Novel electrochemical sensor based on N-doped carbon nanotubes and Fe3O4 nanoparticles: Simultaneous voltammetric determination of ascorbic acid, dopamine and uric acid

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Diana M Fernandes (Author) FCUP; Marta Costa (Author) Other; Clara Pereira (Author) FCUP; Belen Bachiller Baeza (Author) Other; Inmaculada Rodriguez Ramos (Author) Other; Antonio Guerrero Ruiz (Author) Other; Cristina Freire (Author) FCUP

Journal

Title: Journal of Colloid and Interface Science

Vol. 432

Pages: 207-213

ISSN: 0021-9797

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 9 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-009-R3F

DOI: 10.1016/j.jcis.2014.06.050

Abstract (EN): A new modified electrode based on N-doped carbon nanotubes functionalized with Fe3O4 nanoparticles (Fe3O4@CNT-N) has been prepared and applied on the simultaneous electrochemical determination of small biomolecules such as dopamine (DA), uric acid (UA) and ascorbic acid (AA) using voltammetric methods. The unique properties of CNT-N and Fe3O4 nanoparticles individually and the synergetic effect between them led to an improved electrocatalytic activity toward the oxidation of AA, DA and UA. The overlapping anodic peaks of these three biomolecules could be resolved from each other due to their lower oxidation potentials and enhanced oxidation currents when using the Fe3O4@CNT-N modified electrode. The linear response ranges for the square wave voltammetric determination of AA, DA and UA were 5-235, 2.5-65 and 2.5-85 mu mol dm(-3) with detection limit (S/N = 3) of 0.24, 0.050 and 0.047 mu mol dm(-3), respectively. These results show that Fe3O4@CNT-N nanocomposite is a promising candidate of cutting-edge electrode materials for electrocatalytic applications.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7