Abstract
Tungsten oxide based materials have received a great attention in the fabrication of semiconducting oxide based gas sensor devices. In the present work the preparation of nanocrystalline hexagonal WO3 (hex-WO3) from sodium tungstate solution by acidic precipitation as a nanocrystalline processing route is presented. Metal decorated carbon nanotubes (CNTs) were added to hex-WO3 nanopowder with the aim to further lower the operating temperature of sensors. Hex-WO3/Au-decorated MWCNTs composites were able to detect as low as 100 ppb of NO2, with no need to heat the sensors substrates during operation, which demonstrates the high potential of our new gas sensors. The developed porous tungsten oxide nanofibers might be find application on a special chip designed for gas sensorics.
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Acknowledgements
The work was supported by the bilateral NSF-OTKA-MTA co-operation, contract # MTA:96 OTKA: 049953. The authors are grateful to Felten and Pireaux for providing to this study the metal decorated CNTs. Many thanks to Tóth for SEM, Ionescu and Prof. Gouma for sensor measurements. We acknowledge the financial help from NIH-DST Hungarian-Indian program.
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Balázsi, C., Lukács, I.E., Balázsi, K. (2013). Chemical Sensors Based on Nano-hexagonal Tungsten Oxide: Synthesis and Characterization. In: Vaseashta, A., Khudaverdyan, S. (eds) Advanced Sensors for Safety and Security. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7003-4_10
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