Synthesis Methods, Microscopy Characterization and Device Integration of Nanoscale Metal Oxide Semiconductors for Gas Sensing

Sensors

Randy L. Vander Wal³  Gordon M. Berger¹  Michael J. Kulis¹  Gary W. Hunter²  Jennifer C. Xu² 

[1] The National Center for Space Exploration Research (NCSER), 21000 Brookpark Road, Cleveland, OH 44135, USA; E-Mails:;NASA Glenn Research Center, 21000 Brookpark Road Cleveland, OH 44135, USA; E-Mails:;Penn State University, Department of Energy and Mineral Engineering, The Energy Institute and The Penn State Institutes of Energy and The Environment (PSIEE), 203 Hosler Bldg. University Park, PA 16802, USA

关键词: metal oxide;    gas sensor;    nanostructure;    integration;    nanorods;    catalyst;    gas detector;    gas analysis;   

DOI  :  10.3390/s91007866

来源: mdpi

【 摘 要 】

A 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 activation energies for the catalyst-assisted systems.

【 授权许可】

CC BY   
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.