The Electrical Conductivity of Graphite Nanoplatelet Filled Conjugated Polyacrylonitrile

Abstract

The electrical conductivity of composites of exfoliated graphite nanoplatelets (GNPs), including bromine‐doped GNP, and conjugated polyacrylonitrile has been investigated. The focal point is the dual nature of the graphite nanoparticles, which exhibit both intrinsic electrical conductivity and doping capability of semi‐conductive polymers such as conjugated polyacrylonitrile to form charge‐transfer complexes. The conductivity is particularly enhanced in conjugated polyacrylonitrile composites (e.g., with 6 wt.‐% graphite nanoplatelets) where the value rises from 1 × 10−10 to 2 × 10−3 S · cm−1, which reflects jointly the conductivity of the doped semi‐conductive polymer together with the percolation‐based conductivity of the particles.magnified image

Characterization of drawn monofilaments of liquid crystalline polymer/carbon nanoparticle composites correlated to nematic order

“…Graphite nano-platelets (GNP) were prepared according to the method described in our previous studies [14] and provided by J.K. Kim of HKUST-Hong Kong. A graphite intercalation compound (GIC) that contained 2.8 wt.% of sulfur as intercalant (supplied by Asbury Graphite Mills, USA) was put into an oven that was maintained at 1050 C and taken out after 30 s to produce expanded graphite.…”

“…The expanded graphite was immersed in acetone and ultrasonicated at 70 W and 42 kHz for 8 h to obtain exfoliated GNPs. The average thickness and diameter of the GNPs were estimated to be 4.5 nm and 46 mm, respectively[14].…”

A review of graphene-oxide/metal–organic framework composites materials: characteristics, preparation and applications

“…GO has been used to construct various hybrid nanosheet functional composites materials, showing excellent adsorption performance [225][226][227][228]. To increase the permeability of the GO molecular sieve membranes, MOF particles can be inserted between the GO nanosheets to expand the layer spacing.…”

Pressure Sensors Based on Polyvinyl Chloride/Graphite/Nickel Nanocomposites

“…It leads to a decrease in resistivity with the increasing of the applied pressure on the samples, because the gap changes between the adjacent conducting filler particles is the intrinsic mechanism behind the abrupt changes in the resistivity of the nanocomposites. This means that the pressuresensitive behavior is mainly related to the times of compression [4,8].…”

“…Pressuresensitive conducting polymer composites (CPCs) are receiving a wide attention today in various fields due to their ease of processing, flexibility, and a range of characteristic properties, which can offer a diversity and tailor made to suit the application [3][4][5]. Such piezo materials are useful as electromechanical sensors [6], in medical instrumentation [7], robotics [8], ultrasonic or underwater transducers [9], audio applications [10], and so forth. It is postulated that the electrical resistivity change of CPCs is related to the formation or destruction of conductive networks [11].…”