Study of CNT/ZnO/PANI Nanocomposite Biosensors

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Yazdanbakhsh Sorkhabi, Khashayar | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46977 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Dolati, Abolghasem
Abstract:
For application as a biosensor electrode, Aligned Carbon Nanotubes (CNTs) were produced on Stainless Steel 304 substrate by optimizing the CVD method. For better performance, Zinc Oxide (ZnO) nanoparticles were coated on CNTs, using electrochemical deposition method at room temperature and process variables were optimized to acquire discrete particles with a narrow distribution. After that, Polyaniline, which is a conductive polymer, was electropolymerized on CNT/ZnO composite to further improve the electrocatalytic abilities of the electrode. The produced electrode was then used to detect glucose by Cyclic Voltammetry and Amperometry methods. This electrode shows a linear relationship between 0.1 to 1 mM and 1 to 6 mM of glucose concentration. Detection limit of the electrode is 0.1 µM in signal to noise ratio of 3, and sensitivity of the electrode is 0.2 mA.cm-2/mM. The electrode shows good stability and reproducibility with an RSD of 3.2 % for 6 electrodes that prepared identically. The electrode repeated 93.7% of its initial peak after two weeks of storage in the air
Keywords:
Carbon Nanotubes ; Polyaniline ; Conductive Polymer ; Electropolymerization ; Biosensor ; Zinc Oxide ; Glucose

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