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Carbon Nanotube Based Chemical Sensors for Space and Terrestrial ApplicationsA nanosensor technology has been developed using nanostructures, such as single walled carbon nanotubes (SWNTs), on a pair of interdigitated electrodes (IDE) processed with a silicon-based microfabrication and micromachining technique. The IDE fingers were fabricated using photolithography and thin film metallization techniques. Both in-situ growth of nanostructure materials and casting of the nanostructure dispersions were used to make chemical sensing devices. These sensors have been exposed to nitrogen dioxide, acetone, benzene, nitrotoluene, chlorine, and ammonia in the concentration range of ppm to ppb at room temperature. The electronic molecular sensing of carbon nanotubes in our sensor platform can be understood by intra- and inter-tube electron modulation in terms of charge transfer mechanisms. As a result of the charge transfer, the conductance of p-type or hole-richer SWNTs in air will change. Due to the large surface area, low surface energy barrier and high thermal and mechanical stability, nanostructured chemical sensors potentially can offer higher sensitivity, lower power consumption and better robustness than the state-of-the-art systems, which make them more attractive for defense and space applications. Combined with MEMS technology, light weight and compact size sensors can be made in wafer scale with low cost. Additionally, a wireless capability of such a sensor chip can be used for networked mobile and fixed-site detection and warning systems for military bases, facilities and battlefield areas.
Document ID
20090035832
Document Type
Conference Paper
Authors
Li, Jing
(NASA Ames Research Center Moffett Field, CA, United States)
Lu, Yijiang
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 24, 2013
Publication Date
May 24, 2009
Subject Category
Chemistry And Materials (General)
Report/Patent Number
ARC-E-DAA-TN452
Meeting Information
Electrochemical Society Spring Meeting 2009(San Francisco, CA)
Funding Number(s)
WBS: WBS 999574.01.02.01.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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