Journal
MICROCHIMICA ACTA
Volume 186, Issue 7, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3518-2
Keywords
Graphene; Polypyrrole; Hybrid composite; Nanocomposite; Modified electrode; Neurotransmitter; Electrochemical sensor
Categories
Funding
- National Natural Science Foundation of China [21305106]
- Shaanxi Province Natural Science Foundation of China
Ask authors/readers for more resources
This paper presents a method for the preparation of a graphene-based hybrid composite film by electrodeposition of reduced graphene oxide and overoxidized electropolymerized polypyrrole onto a glassy carbon electrode (GCE) using cyclic voltammetry. The morphology of the hybrid composite film was characterized by scanning electron microscopy. The electrochemical activity of the modified GCE was studied by cyclic voltammetry using the negatively charged redox probe Fe(CN)(6)(3-) and the positively charged redox probe Ru(NH3)(6)(3+). The modified GCE displays excellent electrocatalytic activity for dopamine (DA) and uric acid (UA), but electrostatically repulses ascorbate anion under physiological pH conditions. The voltammetric response to DA is linear in the 2.0M to 160M concentration range even in the presence of 1.0mM ascorbic acid and 0.1mM of UA. The detection limit is 0.5M. The amperometric response to DA (best measured at 0.22V vs. Ag/AgCl) extends from 0.4M to 517M and has a 0.2M detection limit.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available