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Permanent link (DOI): https://doi.org/10.7939/R3W032

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Electrically Conductive Metal Nanowire Polymer Nanocomposites Open Access

Descriptions

Other title
Subject/Keyword
Copper Nanowire
Polymer
Electrically conductive
Nanocomposite
Nickel Nanowire
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Luo, Xiaoxiong
Supervisor and department
Uttandaraman Sundararaj, Chemical and Petroleum Engineering, University of Calgary
Jingli Luo, Chemical and Materials Engineering, University of Alberta
Examining committee member and department
Yuning Li, Department of Chemical Engineering and Waterloo Institute for Nanotechnology (WIN), University of Waterloo
Uttandaraman Sundararaj, Chemical and Petroleum Engineering, University of Calgary
Jingli Luo, Chemical and Materials Engineering, University of Alberta
Dongyang Li, Chemical and Materials Engineering, University of Alberta
Jeffrey M. Stryker, Department of Chemistry, University of Alberta
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2012-12-13T09:32:05Z
Graduation date
2013-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
This thesis investigates electrically conductive polymer nanocomposites formulated with metal nanowires for electrostatic discharge and electromagnetic interference shielding. Copper nanowires (CuNWs) of an average length of 1.98 µm and diameter of 25 ± 4 nm were synthesized. The oxidation reaction of the CuNWs in air can be divided into two stages at weight of 111.2% on TGA curves. The isoconversional activation energies determined by Starink method were used to fit the different master plots. Johnson-Mehl-Avrami (JMA) equation gave the best fit. The surface atoms of the CuNWs are the sites for the random nucleation and the crystallite strain in the CuNWs is the driving force for the growth of nuclei mechanism during the oxidation process. To improve the anti-oxidation properties of the CuNWs, silver was coated onto the surface of the CuNWs in Ag-amine solution. The prepared silver coated CuNWs (AgCuNWs) with silver content of 66.52 wt. %, diameter of 28–33 nm exhibited improved anti-oxidation behavior. The electrical resistivity of the AgCuNW/low density polyethylene (LDPE) nanocomposites is lower than that of the CuNW/LDPE nanocomposites with the same volume percentage of fillers. The nanocomposites formulated with CuNWs and polyethylenes (PEs) were compared to study the different interaction between the CuNWs and the different types of PE matrices. The electrical conductivity of the different PE matrices filled with the same concentrations of CuNWs correlated well with the level of the CuNW dispersion. The intermolecular force and entanglement resulting from the different macromolecular structures such as molecular weight and branching played an important role in the dispersion, electrical properties and rheological behaviour of the CuNW/PE nanocomposites. Ferromagnetic polycrystalline nickel nanowires (NiNWs) were synthesized with uniform diameter of ca. 38 nm and an average length of 2.68 µm. The NiNW linear low density polyethylene (LLDPE) nanocomposites exhibited electrical percolation threshold at NiNW volume fraction of 0.005. The power law fitting results imply that the electrical conductivity of the NiNW/LLDPE nanocomposites mainly originated from the contact among individual nanowires.
Language
English
DOI
doi:10.7939/R3W032
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Luo X, Gelves GA, Sundararaj U, Luo JL. Silver coated copper nanowires with improved anti-oxidation property as conductive fillers in low density polyethylene. The Canadian Journal of Chemical Engineering 2012; 9999: 1‒8.Luo X, Sundararaj U, Luo JL. Oxidation kinetics of copper nanowires synthesized by AC electrodeposition of copper into porous aluminum oxide templates. Journal of Materials Research. 2012; 27: 1755‒1762.

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