The effect of Mn on flame spray pyrolysis-made ZnO nanoparticles for flammable gases detection

• Main Authors: Tamaekong,N., Samerjai,T., Liewhiran,C., Wisitsoraat,A., Phanichphant,S.
• Format: Article
• Published: American Scientific Publishers 2015
• Subjects: Chemistry (all); Bioengineering; Materials Science (all); Biomedical Engineering; Condensed Matter Physics
• Online Access: http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84928039263&origin=inward; http://cmuir.cmu.ac.th/handle/6653943832/38930
• Institution: Chiang Mai University

Copyright © 2014 American Scientific Publishers. All rights reserved. The application of Mn-loaded ZnO nanoparticles to the design of flammable gas sensors is nowadays one of the most active research fields, due to their high activity, good adsorption characteristics and high selectivity with high response to toxic and combustible gases. It is sensitive to many gases at moderate temperature, such as C<inf>2</inf>H<inf>4</inf>, CH<inf>4</inf> and C<inf>2</inf>H<inf>2</inf> gases. FSP presents a new technique for 0.25-1.00 mol% Mn-loaded ZnO nanoparticles synthesis which involves only a single step. The crystallite sizes of ZnO spherical and hexagonal particles were found to be ranging from 5 to 15 nm while ZnO nanorods were seen to be 5-15 nm in width and 20-40 nm in length. In addition, very fine Mn nanoparticles were uniformly deposited on the surface of ZnO particles. The highest response for CH<inf>4</inf> gas was ∼240 towards 0.50 mol% Mn-loaded ZnO at 1.0 vol.% concentration of CH<inf>4</inf> in dry air at 300 °C. The response of 0.50 mol% Mn-loaded ZnO of C<inf>2</inf>H<inf>4</inf> gas was as high as 72 for 1.0 vol.% while the response for C<inf>2</inf>H<inf>2</inf> gas was ∼13 towards 0.50 mol% Mn-loaded ZnO at 1.0 vol.% concentration of C<inf>2</inf>H<inf>2</inf> in dry air at 300 °C.