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Synthesis of titanium oxide-Polyaniline nanotube composite and its superior field emission characteristics

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4 Author(s)
Patil, S.S. ; Dept. of Phys., Univ. of Pune, Pune, India ; More, M.A. ; Koiry, S.P. ; Aswal, D.K.

Titanium oxide (TiO2)-Polyaniline (PANI) nanotube composite has been synthesized in two steps. The TiO2 nanoparticles were synthesized by electrochemical etching of titanium foil and annealing at 500°C in air in the first step; followed by formation of TiO2-PANI nanotube composite by chemical polymerization using acetic acid as dopant in the second step. The synthesized TiO2-PANI nanotube composite was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDAX), Uv-visible spectroscopy and Fourier transform infrared spectroscopy (FTIR). The SEM and EDAX results clearly reveal formation of TiO2-PANI nanotube composite. The TiO2 nanoparticles (40-50nm) envisaged as adhered to the PANI nanotubes, which are several microns long with diameter of 100-150 nm. The UV-visible and FTIR spectra exhibit the characteristic features corresponding to electrically conducting phase of doped PANI. Field electron emission (FE) studies of the TiO2-PANI nanotubes composite were performed in planar diode configuration at base pressure of ~ 1×10-8 mbar. The turn on field required to draw an emission current density of 1 μA/cm2 was found to be 0.95 V/μm, and emission current density of 1 mA/cm2 has been drawn at an applied field of 2.28 V/μm. The TiO2-PANI nanotube composite exhibited good emission current stability at preset values of 10 μA over a duration of more than three hours. The present studies indicate the TiO2-PANI nanotube composite as a promising material for the field emission based applications in vacuum micro-nanoelectronic devices.

Published in:

Vacuum Nanoelectronics Conference (IVNC), 2011 24th International

Date of Conference:

18-22 July 2011