Improved electrogenerated chemiluminescence of luminol by cobalt nanoparticles decorated multi-walled carbon nanotubes
| Autor: | Somayyeh Bozorgzadeh, Azam Tavakoli, Behzad Haghighi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Detection limit
biology General Chemical Engineering 010401 analytical chemistry Inorganic chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Analytical Chemistry Luminol law.invention chemistry.chemical_compound chemistry law Nafion Electrochemistry biology.protein Electrochemiluminescence Glucose oxidase 0210 nano-technology Biosensor Chemiluminescence |
| Zdroj: | Journal of Electroanalytical Chemistry. 762:80-86 |
| ISSN: | 1572-6657 |
| Popis: | Multi-walled carbon nanotubes (MWCNTs) were decorated with cobalt nanoparticles (Co-NPs) by a simple thermal decomposition method. The prepared nanohybrid material (nanoCo-MWCNTs) was then cast on the surface of a glassy carbon electrode (GCE) as a novel electrocatalyst for the construction of a sensitive electrochemiluminescence (ECL) sensor. The fabricated sensor (GCE/nanoCo-MWCNTs/Nafion) showed excellent electrocatalytic activity toward luminol and H 2 O 2 oxidation reactions at neutral media. Under optimal experimental conditions, the ECL signal intensity of the sensor was linear with the concentration of luminol in the range between 80 nM and 140 μM (r = 0.9963) and also with the concentration of H 2 O 2 in the range between 1 nM and 240 μM (r = 0.9980). Detection limits (S/N = 3) for luminol and H 2 O 2 were 8.7 and 0.2 nM, respectively. The relative standard deviations (RSD) for repetitive measurements of 100 μM luminol (n = 10) and 10 μM H 2 O 2 (n = 11) were 1.6% and 2.0%, respectively. Also, the prepared sensor was further modified with glucose oxidase (GOx) to fabricate a glucose ECL based biosensor (GCE/nanoCo-MWCNTs/GOx/Nafion). The fabricated ECL biosensor exhibited excellent performance toward glucose detection in the concentration range between 0.5 and 600 μM with a satisfactory detection limit (50 nM) and reproducibility (2.3%). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect