Abstract
We herein report the functionalization of multi-walled carbon nanotubes (MWCNT) via oxidation method using a concoction of concentrated H2SO4 and HNO3. The electrically conducting polycarbazole-multiwalled carbon nanotubes nanocomposite (PCz/MWCNT) has been prepared by in-situ oxidation polymerization of monomer of carbazole (Cz). Several spectral techniques like FTIR, SEM/EDS, TEM, XRD and TGA were used to characterize PCz/MWCNTs nanocomposite. The spectroscopic data ascertains a strong interaction between PCz and MWCNTs. The nanocomposite exhibits high thermal stability as compared to the pristine PCz. The nanocomposite demonstrated better electrical conductivity and isothermal stability with respect to DC electrical conductivity retention under normal conditions below 100°C. The PCz/MWCNT based sensor was designed for the detection of acetaldehyde. It was observed that the resistivity of the PCz/MWCNT enhances on exposure to acetaldehyde at 25°C, and showed a direct relationship between the response and concentration of acetaldehyde. Moreover, PCz and PCz/MWCNT were also tested for their plausible biocidal activity.
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