Chido, Michael
(2018)
Chirality and Semiconducting-Enriched Single-Walled Carbon Nanotubes and their Applications in Chemical Sensing and Memory Devices.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Single-walled carbon nanotubes (SWCNTs) have shown true promise as highly sensitive chemical sensors and high-performance electronic devices. Only recently, methods have been developed to further purify and separate nanotubes by their electronic properties, metallic or semiconducting, and even by type as individual chiralities. These developments have opened up possibilities to further improve and understand the properties of SWCNTs on a fundamental level. In this work, the exquisite properties of chirality-enriched and semiconducting-enriched SWCNTs (s-SWCNTs) have been explored for applications as chemical sensors and memory storage devices. In the first project, column chromatography was used to separate and enrich specific SWNCT chiralities. Using the product from this process, it was found that the sensor response of chirality-enriched (7,5) SWCNT field-effect transistors (FETs) to monosubstituted benzenes show a linear relationship with the Hammett parameter of the species tested, as was previously found for SWCNT mixtures. In a second project, we explored the properties of poly(oxacyclobutane) (POCB) and its crystallization with water at room temperature to form a polymer hydrate crystal structure. This polycrystalline material was found to have aligned 1D columns of water contained within its structure and we found that the material can be capacitively charged. The crystallization of the polymer and water was observed with electronic measurement by s-SWCNT FET devices as a large increase in capacitance was observed upon crystallization. These POCB-coated s-SWCNT devices were applied as memory cell devices and showed bit separation of 10^4. In the final project, metal nanoparticle decorated s-SWCNT devices were applied as gas sensors in a proof of concept experiment using the AC heterodyne measurement technique. We showed that even in the presence of large charge transfer, such as hydrogen binding to palladium nanoparticles on the surface of SWCNTs, there is no signal with the AC method as opposed to the large signal observed in traditional DC FET measurement. Hydrogen sulfide elicited a sensor response in both AC and DC techniques as was expected.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
29 January 2018 |
| Date Type: |
Publication |
| Defense Date: |
6 December 2017 |
| Approval Date: |
29 January 2018 |
| Submission Date: |
1 January 2018 |
| Access Restriction: |
3 year -- Restrict access to University of Pittsburgh for a period of 3 years. |
| Number of Pages: |
88 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
field-effect transistor, chemical sensors, nanotube memory, AC heterodyne |
| Date Deposited: |
29 Jan 2018 21:34 |
| Last Modified: |
29 Jan 2021 06:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/33670 |
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