Hu, Yushi
(2008)
Single Palladium Nanowire: Synthesis Via Electrophoresis Deposition and Hydrogen Sensing.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Palladium (Pd) single nanowires with less than 100 nm thickness have been successfully and repeatedly fabricated using electrophoresis deposition method. This work also demonstrates the use of a single Pd nanowire as a hydrogen sensor with extremely high sensitivity. Growth and sensing mechanisms are discussed in detail and an improved synthesis method is proposed and proved.Single Pd nanowires were electrodeposited within 100 nm wide Poly-Methyl-Methacrylate (PMMA) nanochannels by using a probe station. The PMMA channels were fabricated by Electron Beam Lithography (EBL) on a pre-patterned template fabricated via photolithography and lift-off processes. Through this method, nanowires were grown with widths ranging from 50 nm to 100 nm, and lengths from 3.5 ¦Ìm to 6.5 ¦Ìm. The nanowires, successfully integrated into hydrogen sensor devices, were able to sense hydrogen concentrations as low as 5 ppm (part per million) at room temperature. Three different nanowire structures were found, and the growth control of nanowire structure was conducted. Different sensing mechanisms were addressed in detail according to different nanowire structures.A newly developed gate assisted growth method were also proposed and approved in this work. Thinner and more uniform nanowires were synthesized with this method, and the growth time was greatly reduced. Experimental data were presented to approve the effects of gate voltage on nanowire diameter and growth time.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
8 September 2008 |
| Date Type: |
Completion |
| Defense Date: |
23 July 2008 |
| Approval Date: |
8 September 2008 |
| Submission Date: |
9 July 2008 |
| Access Restriction: |
5 year -- Restrict access to University of Pittsburgh for a period of 5 years. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical Engineering |
| Degree: |
MSEE - Master of Science in Electrical Engineering |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Hydrogen sensing; Nanowire; Palladium |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-07092008-170825/, etd-07092008-170825 |
| Date Deposited: |
10 Nov 2011 19:50 |
| Last Modified: |
15 Nov 2016 13:45 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/8320 |
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