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Dye-assisted dispersion of single-walled carbon nanotubes for solution fabrication of NO2 sensors
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Direct golden orange dye molecules were used as a dispersing agent to produce suspensions of single-walled carbon nanotubes(SWCNTs) in water. Uniform, thin film networks were fabricated by vacuum filtration using different concentrations of SWCNT and transferred subsequently to glass substrates. The dispersion efficiency was compared to other surfactants. Measurement of the sheet resistance as a function of SWCNT concentration showed a transition from 2D percolation to 3D conduction behaviour when the concentration of SWCNTs exceeded 0.001 mg/mL. The electrical response to NO2 gas exposure was investigated as a function of temperature and an optimum response was observed at 200°C.
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