Current-conducting properties of paper consisting of multiwall carbon nanotubes
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ONIC PROPERTIES OF SOLID
CurrentConducting Properties of Paper Consisting of Multiwall Carbon Nanotubes1 E. N. Tkacheva,*, T. I. Buryakovb, V. L. Kuznetsovc, S. I. Moseenkovc, I. N. Mazovc, S. I. Popkovd, and K. A. Shaikhutdinovd aNikolaev
Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia *email: [email protected] bSiberian Physicotechnical Institute, Tomsk State University, Novosobornaya pl. 1, Tomsk, 634050 Russia c Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia dKirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia
Abstract—Electrical conductivity σ(T) of the paper consisting of multiwalled carbon nanotubes (MWCNTs) is studied in the temperature range 4.2–295 K, and its magnetoresistivity ρ(B) at various temperatures in magnetic fields up to 9 T is analyzed. The temperature dependence of the paper electrical conductivity σ(T) exhibits twodimensional quantum corrections to the conductivity below 10 K. The dependences of negative magnetoresistivity ρ(B) measured at various temperatures are used to estimate the wavefunction phase break down length Lϕ of conduction electrons and to obtain the temperature dependence Lϕ = constT–p/2, where p ≈ 1/3. Similar dependences of electrical conductivity σ(T), magnetoresistivity ρ(B), and phase breakdown length Lϕ(T) are detected for the initial MWCNTs used to prepare the paper. DOI: 10.1134/S1063776113050257 1
1. INTRODUCTION
Composite materials based on carbon nanotubes are most promising for the applications using their properties [1]. The designing and properties of such materials are being extensively studied for various fields of application. Many works deal with the changes in the properties of composite materials that are caused by the introduction of a relatively low nan otube concentration [2, 3]. However, the properties of composite materials based on nanotubes with a low binder content have received little attention. Paper consisting of multiwalled carbon nanotubes (MWCNTs) with a low content or without a binder combines the unique properties of the initial nano tubes and the properties of a bulk material (film). Therefore, paper is a more convenient material for applied purposes as compared to the initial carbon nanotubes. Paper can be applied for catalysis, for ultrafiltration, in supercapacitors, as electrodes, for heat removal, and so on. One of the unique properties of carbon nanotubes and paper based on them is a high electrical and thermal conductivity. Nevertheless, the problems related to the electron transport in paper are still poorly understood. There are no systematic inves tigations of the electron transport in the paper consist ing of MWCNTs with a controlled diameter distribu tion of carbon nanotubes, since the nanotube diame 1 The article is based on a preliminary report delivered at the 36th
Conference on LowTemperature Physics (St. Petersburg, July 2–6, 2012).
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