SYNTHESIS OF IN2O3 NANOWIRES FOR THE APPLICATION OF LPG SENSOR

Sh. Romeo Meitei, Naorem Khelchand Singh

Abstract: In2O3 nano-column arrays are synthesized on p-type Si substrate by glancing angle deposition technique (GLAD). Indium Oxide is a wide-band gap Semiconductor which shows prospective potential for gas sensors. After the deposition is completed, the Crystallinity and the Orientation of the as-deposited Indium Oxide Nanowires are observed using the X-ray Diffractometer (XRD). Extrapolation of the linear part of the curve to the hv-axis from E Vs (ahv)2 graph from optical absorption spectrum yields a bandgap close to 3.3eV. Silver (Ag) contact is made over In2O3 nanowires to form In2O3 LPG sensing device. At 2V,under exposure to LPG, the device shows nearly 5 times enhancement in the sensitivity as compared to exposure in ambient atmosphere. This result clearly indicates that In2O3 NW device is a very good contender for efficient and cost effective LPG sensor if fabricated commercially on large scale

Keywords: GLAD,In2O3 Nanowire, XRD, SEM, Optical absorption, Photoluminescence (PL), electrical characteristics

DOI: https://doi.org/10.15623/ijret.2017.0613015