Enzyme-less and low-potential sensing of glucose using a glassy carbon electrode modified with palladium nanoparticles deposited on graphene-wrapped carbon nanotubes
| Autor: | Santhosh P Nagappan Nair, Sundara Ramaprabhu, Pranati Nayak |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Graphene Analytical chemistry Nanochemistry 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Ascorbic acid 01 natural sciences Amperometry 0104 chemical sciences Analytical Chemistry law.invention Catalysis Chemical engineering law Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Microchimica Acta. 183:1055-1062 |
| ISSN: | 1436-5073 0026-3672 |
| DOI: | 10.1007/s00604-015-1729-8 |
| Popis: | The article describes an amperometric sensor for enzyme-less detection of glucose based on homogeneously anchored Pd nanoparticles (Pd-NPs) on graphene - wrapped carbon nanotubes (Pd-GWCNTs) as sensing matrix. The unique features of GWCNTs (such as the highly protruded outer graphene layer and an inner tubular morphology) result in enhanced electrochemical performance compared to the use of conventional multi walled carbon nanotubes (MWCNTs). Glucose electro-oxidation occurs at a rather low working potential (+50 mV vs Ag/AgCl), and glucose can be continuously sensed in 0.1 M NaOH solution in concentrations of up to 19.5 mM. The sensor possesses good reproducibility, a fast response time, stable amperometric response and a lower detection limit. Due to its low working potential, it is not interfered by dopamine, uric acid, ascorbic acid, sucrose, fructose and lactose. We presume that these beneficial properties are a result of the synergetic advantages of using catalytic Pd NPs and graphene wrapped CNTs, both of which facilitate low-potential electrooxidation of glucose. |
| Databáze: | OpenAIRE |
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