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Modification of Vertically Aligned Carbon Nanotubes with RuO2 for a Solid-State pH Sensor

Kahram, Mohaddeseh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42787 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. In this work, a novel type electrode based on RuO2 nanoparticles-modified vertically aligned carbon nanotubes (RuO2/MWCNTs) was investigated. ThisRuO2/MWCNTs electrode not only shows a high capacity nature,but also possesses a good response to the pH value. In order to develope this sensor, aligned carbon nanotubes were synthesized by the chemical vapor deposition at first and then modified with RuO2 nanopartcles by sol-gel method. Various parameters affecting the growth of nanotubes, such as substrate type, surface finishing, surface roughness, the growth temperature and carbon feed rate was studiedand and optimal conditions for growth were obtained. At last, aligned nanotubes with a diameter of about 100 nm and a length of 9 microns were produced. Moreover, ruthenium oxide deposition parameters on the sol – gel process, sol concentration and the appropriate heating temperature, to achieve maximum electrochemical capacity and the best sensing properties are 0.1 Mol Ruthenium Chloride, respectively. The electrochemical study for supercapacitor was tested by cyclic voltammetry (CV) in 0.5 M H2SO4 electrolyte and maximum specific capacitance of 1200 F g−1 is obtained. The pH sensor based on the RuO2/MWCNTs nanocomposite electrode exhibits some advantages over the conventional pH sensors. It shows good reproducibility and linear response in the whole pH range (2–12) of Britton–Robinson (B–R) buffer solutions with near-Nernstian response. Sensitivity of the electrode developed in this work is 64.7
    mV/pH.
  9. Keywords:
  10. Carbon Nanotubes ; Sol-Gel Method ; PH Sensor ; Ruthenium Oxide ; Chemical Vapor Deposition (CVD)

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