ENHANCEMENT IN THE SENSING PROPERTIES OF METHYL ORANGE THIN FILM BY TiO2 NANOPARTICLES
Authors:
- 6 February 2014
- journal article
- Published by World Scientific Pub Co Pte Ltd in International Journal of Modern Physics B
- Vol. 28 (05)
Abstract
This paper reports the enhancement in the sensing properties of organic dye methyl orange (MO) by introducing TiO 2 nanoparticles. For this purpose, two surface type Ag/MO/Ag and Ag/MO : TiO 2/ Ag multifunctional sensors were fabricated by spin coating a 3.0 wt.% solution of MO and 3.0:0.3 wt.% of MO : TiO 2 composite on pre-patterned silver (Ag) electrodes. The gap between Ag electrodes was 40 μm. The Ag/MO/Ag and Ag/MO : TiO 2/ Ag structures were characterized to investigate their response towards humidity and temperature variations. The Ag/MO : TiO 2/ Ag sensor exhibited better sensitivity and response time than Ag/MO/Ag sensor. The large surface to volume ratio of TiO 2 nanoparticles is the primary reason for the higher sensitivity of Ag/MO : TiO 2/ Ag sensor. The sensors can be used to detect humidity variations from 30% to 95% RH and temperature variation from 30°C to 200°C with good stability. Surface morphologies of the film were investigated by scanning electron microscope (SEM).Keywords
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