MnFe2O4@CNT-N as novel electrochemical nanosensor for determination of caffeine, acetaminophen and ascorbic acid

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Diana M Fernandes (Author) FCUP; Silva, N (Author) Other; Clara Pereira (Author) FCUP; C. Moura (Author) FCUP; Magalhaes, JMCS (Author) Other; Bachiller Baeza, B (Author) Other; Rodriguez Ramos, I (Author) Other; Guerrero Ruiz, A (Author) Other; Delerue Matos, C (Author) Other; Cristina Freire (Author) FCUP

Journal

Title: Sensors and Actuators, B: Chemical

Vol. 218

Pages: 128-136

ISSN: 0925-4005

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 39 Citations

Scopus - 39 Citations

Other information

Authenticus ID: P-00G-596

DOI: 10.1016/j.snb.2015.05.003

Abstract (EN): For the first time, a glassy carbon electrode (GCE) modified with novel N-doped carbon nanotubes (CNTN) functionalized with MnFe2O4 nanoparticles (MnFe2O4@CNT-N) has been prepared and applied for the electrochemical determination of caffeine (CF), acetaminophen (AC) and ascorbic acid (AA). The electrochemical behaviour of CF, AC and AA on the bare GCE, CNT-N/GCE and MnFe2O4@CNT-N/GCE were carefully investigated using cyclic voltammetry (CV) and square-wave voltammetry (SWV). Compared to bare GCE and CNT-N modified electrode, the MnFe2O4@CNT-N modified electrode can remarkably improve the electrocatalytic activity towards the oxidation of CF, AC and AA with an increase in the anodic peak currents of 52%, 50% and 55%, respectively. Also, the SWV anodic peaks of these molecules could be distinguished from each other at the MnFe2O4@CNT-N modified electrode with enhanced oxidation currents. The linear response ranges for the square wave voltammetric determination of CF, AC and AA were 1.0 x 10(-6) to 1.1 x 10(-3) mol dm(-3), 1.0 x 10(-6) to 1.0 x 10(-3) mol dm(-3) and 2.0 x 10(-6) to 1.0 x 10(-4) mol dm(-3) with detection limit (S/N= 3) of 0.83 x 10(-6), 0.83 x 10(-6) and 1.8 x 10(-6) mol dm(-3), respectively. The sensitivity values at the MnFe2O4@CNT-N/GCE for the individual determination of AC, AA and CF and in the presence of the other molecules showed that the quantification of AA and CF show no interferences from the other molecules; however, AA and CF interfered in the determination of AC, with the latter molecule showing the strongest interference. Nevertheless, the obtained results show that MnFe2O4@CNT-N composite material acted as an efficient electrochemical sensor towards the selected biomolecules.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9