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  • 1.
    Kumar, Vijay
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Haspel, Henrik
    MTA-SZTE “Lendület” Porous Nanocomposites Research Group, Rerrich Bela ter 1., Szeged, Hungary; Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1., Szeged, Hungary.
    Nagy, Krisztina
    MTA-SZTE “Lendület” Porous Nanocomposites Research Group, Rerrich Bela ter 1., Szeged, Hungary; Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1., Szeged, Hungary.
    Rawal, Amit
    Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India.
    Kukovecz, Akos
    MTA-SZTE “Lendület” Porous Nanocomposites Research Group, Rerrich Bela ter 1., Szeged, Hungary; Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1., Szeged, Hungary.
    Leveraging compressive stresses to attenuate the electrical resistivity of buckypaper2016In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 110, p. 62-68Article in journal (Refereed)
    Abstract [en]

    Buckypaper (BP) is a planar film that consists of random network of multiwall carbon nanotubes (MWCNTs) held together by weak van der Waals interactions at tube-tube junctions. Although individual carbon nanotubes (CNTs) possess remarkable electrical properties, the electrical resistance of pristine BP is usually too high for practical applications. However, the electrical resistivity of BP can be attenuated by applying modest compressive stresses. Herein, we report an analytical model for predicting the electrical resistivity of BP under defined level of compressive strain. The predictive piezoresistive model of BP was developed by formulating a direct relationship with the structural parameters, physical and electrical properties of CNTs. The basis of the piezoresistive model relied upon the geometrical probability approach in combination with classical Hertzian contact mechanics and constriction resistance techniques. A comparison has been made between the theoretical and experimental results of electrical resistivity of BPs with varying densities. A reasonably good quantitative agreement was obtained between the theory and experiments. The main source of error was caused by the uncertainty in the measurement of the initial BP thickness. Through theoretical modeling, the initial volume fraction of CNTs was found to be one of the key parameters that modulated the piezoresistive behavior of BP.

  • 2. Zhu, Wuming
    et al.
    Börjesson, Anders
    University of Borås, School of Engineering.
    Bolton, Kim
    University of Borås, School of Engineering.
    DFT and tight binding Monte Carlo calculations related to single-walled carbon nanotube nucleation and growth2010In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 48, no 2, p. 470-478Article in journal (Refereed)
    Abstract [en]

    Density-functional theory (DFT) calculations for idealized nucleation processes of (5,5) and (10,0) single-walled carbon nanotubes (SWCNTs) on a 55 atom nickel cluster (Ni-55) showed that it requires a larger chemical potential to grow a carbon island (which is the simplest structure that can lead to formation of the SWCNTs) on the cluster than to extend the island into a SWCNT or to have the carbon atoms dispersed on the cluster surface. Hence, in the thermodynamic limit the island will only form once the (surface of the) cluster is saturated with carbon, and the island will spontaneously form a SWCNT at the chemical potentials required to create the island. The DFT (zero Kelvin) and tight binding Monte Carlo (1000 K) also show that there is a minimum cluster size required to support SWCNT growth, and that this cluster size can be used to control the diameter, but probably not the chirality, of the SWCNT at temperatures relevant to carbon nanotube growth. It also imposes a minimum size of clusters that are used for SWCNT regrowth. (C) 2009 Elsevier Ltd. All rights reserved.

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