Open AccessStructural and electrophysical properties of thermally expanded graphite prepared by chemical methods: comparative analysis
Author(s) -
Volodymyr Kotsyubynsky,
Volodymyra Boychuk,
B.І. Rachiy,
Myroslava Hodlevska,
S. I. Budzulyak
Publication year - 2020
Publication title -
fìzika ì hìmìâ tverdogo tìla
Language(s) - English
Resource type - Journals
eISSN - 2309-8589
pISSN - 1729-4428
DOI - 10.15330/pcss.21.4.591-597
Subject(s) - graphite , annealing (glass) , raman spectroscopy , materials science , dielectric spectroscopy , intercalation (chemistry) , atmospheric temperature range , electrical resistivity and conductivity , analytical chemistry (journal) , electrochemistry , chemical engineering , composite material , chemistry , inorganic chemistry , organic chemistry , electrode , physics , electrical engineering , meteorology , optics , engineering
The aim of this paper is the comparison of structural, morphological and electrical properties of thermally extended graphite synthesized by chemical oxidation of graphite with sulfur of nitric acids at all other same conditions. Thermal treatments of graphite intercalation compounds were performed at a temperature of 600°C on the air for 10 min but additional annealing in temperature range of 100-600oC for 1 hour was done. The obtained materials were characterized by XRD, Raman spectroscopy and impedance spectroscopy. The evolution of structural ordering of thermally extended graphite samples at increasing of annealing temperature was traced. It was determined that the additional annealing allows to control the electrical conductivity and structural disordering degree of extended graphite samples that is useful for preparation of efficient current collectors for electrochemical capacitors.