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Ultralow Percolation Threshold in Nanoconfined Domains
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, no 10, p. 9906-9913Article in journal (Refereed) Published
Abstract [en]

Self-assembled percolated networks play an important role in many advanced electronic materials and devices. In nanocarbon composites, decreasing the percolation threshold phi(c) is of paramount importance to reduce nanotube bundling, minimize material resources and costs, and enhance charge transport. Here we demonstrate that three-dimensional nanoconfinement in single-wall carbon nanotube/polymer nanocomposites produces a strong reduction in phi(c) reaching the lowest value ever reported in this system of phi(c) approximate to 1.8 X 10(-5) wt % and 4-5 orders of magnitude lower than the theoretical statistical percolation threshold oh phi(stat) Moreover, a change in network resistivity and electrical conduction was observed with increased confinement, and a simple resistive model is used to accurately estimate the difference in is in the confined networks. These results are explained in terms of networks' size, confinement, and tube orientation as determined by atomic force microscopy, electrical conductivity measurements, and polarized Raman spectroscopy. Our findings provide important insight into nanoscale percolated networks and should find application in electronic nanocomposites and devices.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 11, no 10, p. 9906-9913
Keywords [en]
carbon nanotubes, percolation, nanoconfinement, organic electronics, charge transport
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:umu:diva-141995DOI: 10.1021/acsnano.7b03851ISI: 000413992800032PubMedID: 28949506OAI: oai:DiVA.org:umu-141995DiVA, id: diva2:1159413
Available from: 2017-11-22 Created: 2017-11-22 Last updated: 2018-06-09Bibliographically approved

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Barbero, David R.Boulanger, Nicolas

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