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Direct measurement of charge transport through helical poly(ethyl propiolate) nanorods wired into gaps in single walled carbon nanotubes
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Date
2009-03-11
Author
Wang, Nan
Yano, Koji
Durkan, Colm
Plank, Natalie
Welland, Mark E.
Zhang, Yan
Ünalan, Hüsnü Emrah
Mann, Mark
Amaratunga, G. A. J.
Milne, William I.
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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We report the direct measurement of electrical transport through rod-like polymer molecules, of poly(ethyl propiolate) (PEP), utilizing single walled carbon nanotubes (SWNTs) as electrodes. The electrical properties of the devices were measured (i) before cutting a SWNT, (ii) when a SWNT was cut and (iii) after PEP deposition into the nanoscale gap in a cut SWNT. The gate-dependent electrical properties showed a reduction in current from I-on = 2.4 x 10(-7) A for SWNT devices to I-on = 3.6 x 10(-9) A for PEP bridge devices, both with the ON/OFF ratio of 10(4). Similarly, metallic SWNT devices showed a reduction in current from a few hundreds of mu A for a SWNT device to a few nA for a PEP-SWNT structure. The current density of a single PEP molecule is 10(5)-10(6) A cm(-2), which is relatively high, indicating that the PEP molecule can carry significant current. Use of SWNT electrodes was seen to be an effective method of contacting PEP nanorods to facilitate electrical measurements.
Subject Keywords
Mechanical Engineering
,
Electrical and Electronic Engineering
,
General Materials Science
,
Mechanics of Materials
,
Bioengineering
,
General Chemistry
URI
https://hdl.handle.net/11511/36546
Journal
NANOTECHNOLOGY
DOI
https://doi.org/10.1088/0957-4484/20/10/105201
Collections
Department of Metallurgical and Materials Engineering, Article