Abstract

Using magneto transport, we probe hopping length scales in the variable range hopping conduction of carbonized polyacetylene and polyaniline nanofibers. In contrast to pristine polyacetylene nanofibers that show vanishing magneto conductance at large electric fields, carbonized polymer nanofibers display a negative magneto conductance that decreases in magnitude but remains finite with respect to the electric field. We show that this behavior of magneto conductance is an indicator of the electric field and temperature dependence of hopping length in the gradual transition from the thermally activated to the activation-less electric field driven variable range hopping transport. This reveals magneto transport as a useful tool to probe hopping lengths in the non-linear hopping regime.

Details

Title
Probing variable range hopping lengths by magneto conductance in carbonized polymer nanofibers
Author
Kyung Ho Kim 1 ; Lara-Avila, Samuel 2 ; He, Hans 3 ; Kang, Hojin 4 ; Hong, Sung Ju 5 ; Park, Min 6 ; Eklöf, Johnas 7 ; Moth-Poulsen, Kasper 7   VIAFID ORCID Logo  ; Matsushita, Satoshi 8 ; Akagi, Kazuo 8 ; Kubatkin, Sergey 3 ; Yung Woo Park 9 

 Department of Microtechnology and Nanoscience, Chalmers University of Technology, Gothenburg, Sweden; Department of Physics and Astronomy, Seoul National University, Seoul, Korea 
 Department of Microtechnology and Nanoscience, Chalmers University of Technology, Gothenburg, Sweden; National Physical Laboratory, Teddington, UK 
 Department of Microtechnology and Nanoscience, Chalmers University of Technology, Gothenburg, Sweden 
 Department of Physics and Astronomy, Seoul National University, Seoul, Korea 
 Department of Physics and Astronomy, Seoul National University, Seoul, Korea; Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, Hannover, Germany 
 Department of Physics and Astronomy, Seoul National University, Seoul, Korea; KIST Jeonbuk Institute of Advanced Composite Materials, Jeonbuk, Korea 
 Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden 
 Department of Polymer Chemistry, Kyoto University, Katsura, Kyoto, Japan 
 Department of Physics and Astronomy, Seoul National University, Seoul, Korea; Institute of Applied Physics, Seoul National University, Seoul, Korea; Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA, USA 
Pages
1-7
Publication year
2018
Publication date
Mar 2018
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2036315388
Copyright
© 2018. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.