hexacyanoferrate-iii and 1-2-diaminobenzene

Different types of carbon nanotube material (single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) of different internal diameter) have been used for preparation of CNT-modified glassy-carbon electrodes. Redox reactions involving ferricyanide and hydrogen peroxide were examined at the CNT-modified electrodes. Electrodes modified with SWCNTs usually had better electron-transfer properties than MWCNT-modified electrodes. Glucose biosensors were also prepared with electropolymerized polyphenylenediamine films, CNT materials, and glucose oxidase. Amperometric behavior in glucose determination was examined. SWCNT-modified glucose biosensors usually had a wider dynamic range (from 0.1 to 5.5 mmol L-1) and greater sensitivity in glucose determination. The detection limit was estimated to be 0.05 mmol L-1.

Topics: Biosensing Techniques; Catalysis; Electric Conductivity; Electrochemistry; Electrodes; Ferricyanides; Glucose; Glucose Oxidase; Hydrogen Peroxide; Nanotubes, Carbon; Oxidation-Reduction; Phenylenediamines; Reproducibility of Results