Enhanced electrochemiluminescence from luminol at multi-walled carbon nanotubes decorated with palladium nanoparticles: A novel route for the fabrication of an oxygen sensor and a glucose biosensor
| Autor: | Somayyeh Bozorgzadeh, Behzad Haghighi |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Blood Glucose
Analytical chemistry Metal Nanoparticles chemistry.chemical_element Biosensing Techniques Electrocatalyst Electrochemistry Biochemistry Analytical Chemistry Luminol Glucose Oxidase chemistry.chemical_compound Limit of Detection Humans Environmental Chemistry Electrochemiluminescence Electrodes Spectroscopy Detection limit Nanotubes Carbon Chemistry Temperature Hydrogen Peroxide Oxygen Glucose Luminescent Measurements Linear Models Aspergillus niger Glass Biosensor Oxygen sensor Palladium |
| Zdroj: | Analytica Chimica Acta. 697:90-97 |
| ISSN: | 0003-2670 |
| Popis: | Incorporation of palladium nanoparticles on the surface of multi-walled carbon nanotubes and modification of glassy carbon electrode with the prepared nano-hybrid material led to the fabrication of a novel electrode. The modified electrode showed attractive electrocatalytic activity and sensitizing effect on luminol-O(2) and luminol-H(2)O(2) electrochemiluminescence (ECL) reactions at neutral media. The sensitized luminol-O(2) and luminol-H(2)O(2) reactions were successfully applied for the ECL determination of dissolved O(2) and glucose, respectively. Under the optimal conditions for luminol-O(2) system, the ECL signal intensity of luminol was linear with the concentration of dissolved oxygen in the range between 0.08 and 0.94 mM (r=0.9996) and for luminol-H(2)O(2) system, the ECL signal intensity of luminol was linear with the concentration of glucose in the range between 0.1 and 1000 μM (r=0.9998). The limits of detection (S/N=3) for dissolved oxygen and glucose were 0.02 mM and 54 nM, respectively. The relative standard deviations (RSD) for repetitive measurements of 0.50 mM oxygen (n=10) and 10 μM glucose (n=30) were 3.5% and 0.3%, respectively. Also, under the optimal conditions for luminol-H(2)O(2) system, the ECL signal intensity of luminol was linear with the concentration of H(2)O(2) in the range between 1 nM and 0.45 mM (r=0.9997). The limit of detection (S/N=3) for H(2)O(2) detection was 0.5 nM and the relative standard deviation for repetitive measurements of 10 μM H(2)O(2) (n=10) was 0.8%. |
| Databáze: | OpenAIRE |
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