Impedance characteristics and conductivity of CNT/ABS nanocomposites

• Published in: Journal of physics. D, Applied physics Vol. 46; no. 38; pp. 385305 - 1-8
• Main Authors: Al-Saleh, Mohammed H, Al-Anid, Haya K, Husain, Yazan A, El-Ghanem, Hasan M, Jawad, Saadi Abdul
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 25.09.2013; Institute of Physics
• Subjects: Carbon nanotubes; Contact; Cross-disciplinary physics: materials science; rheology; Dielectric properties; Direct current; Dispersions; Exact sciences and technology; Frequency ranges; Impedance; Impedance spectroscopy; Materials science; Nanocomposites; Nanocrystalline materials; Nanoparticles; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Nanotubes; Other materials; Physics; Polymer nanocomposite; Specific materials; Electrical conductivity; Material processing; Fillers; Tunnel effect; Carbon nanotubes; Dispersions; Butadiene; Nanoparticles; Vibrations; Quantity ratio; Transmission electron microscopy; Nanocomposites; Multiwalled nanotube; Direct current; Polymers; Nanostructured materials; Electrical characteristic; Alternating current
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/46/38/385305

Electrical impedance characteristics of multi-walled carbon nanotube (MWCNT)/acrylonitril-butadiene-styrene nanocomposite was studied as a function of MWCNT concentration in the frequency range of 100-106 Hz. The nanocomposites were prepared by solution processing and characterized to have good dispersion of the nanofiller within the polymer matrix as observed by the transmission electron microscopy. In the frequency range of 1-104 Hz, the alternating current (ac) conductivity versus frequency plot of the 0.25 wt% MWCNT nanocomposite exhibited a direct current (dc) plateau indicating that there is a segregated network within this nanocomposite. In the low-frequency region, the bode diagram of the real part of impedance and ac conductivity of the nanocomposites filled with 0.25 wt% up to 4 wt% MWCNT showed a frequency independent plateau followed by an increase obeying the universal dynamic response indicating that conduction in this MWCNT concentration range might be due to tunnelling in addition to the direct contact between filler nanoparticles. For nanocomposites filled with at least 7 wt% MWCNT, the ac conductivity was frequency independent over the entire frequency range (up to 106 Hz) revealing that conduction is due to direct contact between nanoparticles.