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Synthesis Methods, Microscopy Characterization and Device Integration of Nanoscale Metal Oxide Semiconductors for Gas Sensing in Aerospace ApplicationsA comparison is made between SnO2, ZnO, and TiO2 single-crystal nanowires and SnO2 polycrystalline nanofibers for gas sensing. Both nanostructures possess a one-dimensional morphology. Different synthesis methods are used to produce these materials: thermal evaporation-condensation (TEC), controlled oxidation, and electrospinning. Advantages and limitations of each technique are listed. Practical issues associated with harvesting, purification, and integration of these materials into sensing devices are detailed. For comparison to the nascent form, these sensing materials are surface coated with Pd and Pt nanoparticles. Gas sensing tests, with respect to H2, are conducted at ambient and elevated temperatures. Comparative normalized responses and time constants for the catalyst and noncatalyst systems provide a basis for identification of the superior metal-oxide nanostructure and catalyst combination. With temperature-dependent data, Arrhenius analyses are made to determine an activation energy for the catalyst-assisted systems.
Document ID
20090019027
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
VanderWal, Randy L. (Pennsylvania State Univ. State College, PA, United States)
Berger, Gordon M. (National Center for Space Exploration Research on Fluids and Combustion Cleveland, OH, United States)
Kulis, Michael J. (National Center for Space Exploration Research on Fluids and Combustion Cleveland, OH, United States)
Hunter, Gary W. (NASA Glenn Research Center Cleveland, OH, United States)
Xu, Jennifer C. (NASA Glenn Research Center Cleveland, OH, United States)
Evans, Laura J. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
March 1, 2009
Subject Category
Metals And Metallic Materials
Report/Patent Number
NASA/TM-2009-215607
E-16639-2
Funding Number(s)
WBS: WBS 441261.04.01.01.03.09
Distribution Limits
Public
Copyright
Public Use Permitted.

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