P1.4.11 Fabrication of LPG Sensors Based upon Chemically Tailored Sizes of Chromium Oxide Nanoparticles

14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
P1.4 Nanostructured Sensors
N. Kohli, O. Singh, R. Singh - Department of Physics, Guru Nanak Dev University (India), M. Singh - Department of Applied Sciences, Khalsa College of Engineering & Technology (India)
1012 - 1015


In this work, an attempt has been made to alter the particle size of chromium oxide and then to investigate sensing behaviour of these Cr2O3 samples towards LPG. We have followed chemical route for synthesizing nanoparticles of chromium oxide. To tailor nanoparticles of chromium oxide, synthesis was carried out at various reaction temperatures namely, 5, 27 and 65°C. In order to understand the structure and morphology of synthesized materials; they were subjected to X-ray diffraction and field emission scanning electron microscope. The obtained results have endorsed our prejudice and we found that reaction temperature has played a pivotal role in tailoring particle sizes. Interestingly, we observed that Cr2O3 nanoparticles synthesized at 27°C were smaller as compared to those synthesized at 5 and 65°C. Thick film gas sensors of thus-prepared Cr2O3 powders were obtained by depositing them on alumina substrates. These fabricated sensors were studied for their optimum operating temperatures for LPG and we found that all the sensors exhibited best response at 250°C. The investigation revealed that sensing response of Cr2O3 nanoparticles synthesized at 27°C was exceptionally higher than that of Cr2O3 nanoparticles synthesized at 5 and 65°C.