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Author Bottacchi, Francesca ♦ Bottacchi, Stefano ♦ Späth, Florian ♦ Namal, Imge ♦ Hertel, Tobias ♦ Anthopoulos, Thomas D.
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher Wiley-VCH
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Technology ♦ Medicine & health
Abstract The current percolation in polymer-sorted semiconducting (7,5) single-walled carbon nanotube (SWNT) networks, processed from solution, is investigated using a combination of electrical field-effect measurements, atomic force microscopy (AFM), and conductive AFM (C-AFM) techniques. From AFM measurements, the nanotube length in the as-processed (7,5) SWNTs network is found to range from ≈100 to ≈1500 nm, with a SWNT surface density well above the percolation threshold and a maximum surface coverage ≈58%. Analysis of the field-effect charge transport measurements in the SWNT network using a 2D homogeneous random-network stick-percolation model yields an exponent coefficient for the transistors OFF currents of 16.3. This value is indicative of an almost ideal random network containing only a small concentration of metallic SWNTs. Complementary C-AFM measurements on the other hand enable visualization of current percolation pathways in the xy plane and reveal the isotropic nature of the as-spun (7,5) SWNT networks. This work demonstrates the tremendous potential of combining advanced scanning probe techniques with field-effect charge transport measurements for quantification of key network parameters including current percolation, metallic nanotubes content, surface coverage, and degree of SWNT alignment. Most importantly, the proposed approach is general and applicable to other nanoscale networks, including metallic nanowires as well as hybrid nanocomposites.
Description Country affiliation: United kingdom
Author Affiliation: Bottacchi F ( Department of Physics and Centre for Plastic Electronics, Imperial College London, SW7 2BW, London, UK.); Bottacchi S ( Independent Consultant, via don Gnocchi 33, 20148, Milan, Italy.); Späth F ( Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, Julius-Maximilian University Würzburg, Am Hubland, 97074, Würzburg, Germany.); Namal I ( Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, Julius-Maximilian University Würzburg, Am Hubland, 97074, Würzburg, Germany.); Hertel T ( Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, Julius-Maximilian University Würzburg, Am Hubland, 97074, Würzburg, Germany.); Anthopoulos TD ( Department of Physics and Centre for Plastic Electronics, Imperial College London, SW7 2BW, London, UK.)
ISSN 16136810
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2016-08-01
Publisher Place Germany
e-ISSN 16136829
Journal Small
Volume Number 12
Issue Number 31


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Source: WHO-Global Index Medicus