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Studies of nanoparticle reinforced polymer coatings for trace gas detection
- Date Issued:
- 2013
- Summary:
- With the goal of improving chemical detection methods for buried improvised explosive devices (IED’s), the intention of this study is to show that functionalized nano-particles improve the sensing properties of a polymer applied to gas sensors. The approach was reinforcing the polymer, Nafion, with acid-functionalized carbon nanotubes (CNT’s). Ammonia was chosen as the analyte for its similarity to IED byproducts without the dangers of toxicity or explosion. Two sensor platforms were investigated: Quartz crystal microbalances (QCM’s) and microcantilevers (MC’s). Preliminary evaluation of treated QCM’s, via frequency analyzer, showed improvements in sensitivity and fast reversal of adsorption; and suggested increased stability. Tests with coated MC’s also supported the findings of QCM tests. Amplitude response of MC’s was on average 4 times greater when the Nafion coating contained CNT’s. Quantitative QCM testing with gas-flow meters showed that with CNT inclusion: the average number of moles adsorbed increased by 35% (>1.2 times frequency response); sensitivity improved by 0.63 Hz/ppt on average; although the detection threshold decreased marginally; but reusability was much better after extended exposures to concentrated ammonia.
Title: | Studies of nanoparticle reinforced polymer coatings for trace gas detection. |
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Name(s): |
Davis, Charles, author Mahfuz, Hassan, Thesis advisor College of Engineering and Computer Science, Degree grantor Department of Ocean and Mechanical Engineering |
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Type of Resource: | text | |
Genre: | Electronic Thesis Or Dissertation | |
Issuance: | single unit | |
Date Created: | Fall 2013 | |
Date Issued: | 2013 | |
Publisher: | Florida Atlantic University | |
Physical Form: | Online Resource | |
Extent: | 54p. | |
Language(s): | English | |
Summary: | With the goal of improving chemical detection methods for buried improvised explosive devices (IED’s), the intention of this study is to show that functionalized nano-particles improve the sensing properties of a polymer applied to gas sensors. The approach was reinforcing the polymer, Nafion, with acid-functionalized carbon nanotubes (CNT’s). Ammonia was chosen as the analyte for its similarity to IED byproducts without the dangers of toxicity or explosion. Two sensor platforms were investigated: Quartz crystal microbalances (QCM’s) and microcantilevers (MC’s). Preliminary evaluation of treated QCM’s, via frequency analyzer, showed improvements in sensitivity and fast reversal of adsorption; and suggested increased stability. Tests with coated MC’s also supported the findings of QCM tests. Amplitude response of MC’s was on average 4 times greater when the Nafion coating contained CNT’s. Quantitative QCM testing with gas-flow meters showed that with CNT inclusion: the average number of moles adsorbed increased by 35% (>1.2 times frequency response); sensitivity improved by 0.63 Hz/ppt on average; although the detection threshold decreased marginally; but reusability was much better after extended exposures to concentrated ammonia. | |
Identifier: | FA0004014 (IID) | |
Note(s): |
Includes bibliography. Thesis (M.S.)--Florida Atlantic University, 2013. |
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Subject(s): |
Conducting polymers Detectors -- Technological innovations Explosives -- Detection Nanocomposites (Materials) Nanostructured materials Smart materials |
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Held by: | Florida Atlantic University Digital Library | |
Sublocation: | Boca Raton, Fla. | |
Persistent Link to This Record: | http://purl.flvc.org/fau/fd/FA0004014 | |
Restrictions on Access: | All rights reserved by the source institution | |
Restrictions on Access: | http://rightsstatements.org/vocab/InC/1.0/ | |
Host Institution: | FAU |