P2GS.17 - Fabrication of Acetaldehyde Gas Sensor through Nanostructured Iron Oxide Thin Films
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-2 - Gas Sensors
- P. Srinivasan, A. Kulandaisamy, K. Babu, J. Balaguru Rayappan - Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) and School of Electrical & Electronics Engineering (SEEE) SASTRA Deemed University, Tamil Nadu (India)
- 800 - 800
Acetaldehyde is one of the major biomarkers indicating the freshness levels of fruits and vegetables. In this context, we report the fabrication of room temperature acetaldehyde gas sensor using spray pyrolysis deposited iron oxide thin films. Influence of precursor concentrations (30, 50, 70 and 100 mM) on the acetaldehyde sensing characteristics was investigated. Structural analysis of all the deposited thin films revealed the formation of orthorhombic phase iron oxide nanostructure with lattice parameters of a=5.095 Å b= 8.789 Å and c= 9.437Å. Increased intensity of the preferential plane orientation (1 2 2) for 10 mM precursor concentration revealed the enhanced crystallinity. Smaller spherical nanograins were observed for all the films and the film deposited at 50 mM precursor concentration exhibited aggregated rod like features. The film deposited at 100 mM precursor concentration showed excellent acetaldehyde sensing characteristics at room temperature with response-recovery times of 19 s and 25 s respectively.