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Enhancement of the transport and dielectric properties of graphite oxide nanoplatelets‐polyvinyl alcohol composite showing low percolation threshold
Author(s) -
Bhadra Debabrata,
Sannigrahi J.,
Chaudhuri B. K.,
Sakata H.
Publication year - 2012
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.22136
Subject(s) - materials science , percolation threshold , composite material , dielectric , percolation (cognitive psychology) , polyvinyl alcohol , composite number , electrical resistivity and conductivity , graphite , graphite oxide , permittivity , conductivity , oxide , electrical engineering , metallurgy , chemistry , optoelectronics , neuroscience , biology , engineering
Graphite oxide nanoplatelets (GOnP) were prepared using standard method and used to make GOnP‐polyvinyl alcohol (PVA) composites by using solution cast technique. Significant enhancement of electrical conductivity and dielectric permittivity of the GOnP/PVA composites are observed at low GOnP concentration ( f GOnP = f c ∼0.41 vol%) which is the percolation threshold value estimated from the concentration dependent transport and dielectric data. Nearly 300 times increase in dielectric permittivity (compared with that of PVA) is observed in the GOnP/PVA composite around f c . We notice interesting metal‐insulator like transition (a sudden increase in resistivity) from the temperature dependent resistivity data in the pure GOnP sample around T MI ∼ 275 K which is shifted to 300 K in the GOnP/PVA composite for f c = 0.41 vol%, indicating drastic change of sp 3 / sp 2 ratio around respective T MI . The present graphite‐based composite material might be processed for different applications. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers