Influence of oxygen ion implantation on the free volume parameters and electrical conductivity of a polymer‐based bakelite RPC detector material

ABSTRACT We have investigated the effect of ion implantation on structural modification and the electrical conductivity of Bakelite‐resistive plate chamber (RPC) detector material used in high energy physics experiments. Samples of Bakelite polymer were exposed to 100 keV and 150 keV oxygen ions in...

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Bibliographic Details
Published in:Journal of applied polymer science 2017-06, Vol.134 (24), p.np-n/a
Main Authors: Aneesh Kumar, K. V., Kumaraswamy, G. N., Ranganathaiah, C., Ravikumar, H. B.
Format: Article
Language:English
Subjects:
ageing
Bakelite
crosslinking
Detectors
Electrical conductivity
Electrical resistivity
free volume
Ion implantation
Materials science
Mathematical models
morphology
Parameters
Polymers
Vinyl resins
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Summary:ABSTRACT We have investigated the effect of ion implantation on structural modification and the electrical conductivity of Bakelite‐resistive plate chamber (RPC) detector material used in high energy physics experiments. Samples of Bakelite polymer were exposed to 100 keV and 150 keV oxygen ions in the fluence of 1012 to 1015 ions cm−2. Ion implantation induced microstructural changes have been studied using positron annihilation lifetime spectroscopy, X‐ray diffraction and Fourier transform infrared techniques. Positron lifetime parameters viz., o‐Ps lifetime and its intensity showed formation of radicals, secondary ions due to the creation of interior tracks by high‐energy ions followed by chain scission at lower fluence of 100 keV implantation. The decreased free volume size at 150 keV ion implantation is an indication of crosslinking and filling up of interior tracks by the implanted ions. Variation of ac conductivity with frequency obeys Jonscher power law at 100 keV and the conduction mechanism is explained by barrier hopping model. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44962.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.44962