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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:11 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Solid State Physics and Materials Science
Title:
Surface structure analysis of some composites by X-ray photoelectron spectroscopy (XPS)
Authors:
D. BALAN (1), C. LOGOFATU (2), Stefania PALADE (1), Aida PANTAZI (1),
Georgiana DUMITRACHE (1), D. DRAGOMIR (1), C. BERBECARU (1)
Affiliation:
1) Faculty of Physics, University of Bucharest, Bucharest – Magurele, 077125, Romania
2) Laboratory of Chemical Analysis of Advanced Materials, National Institute for Material Physics, POBox MG7, 77125 Bucharest Romania
E-mail
danutz_nightshot@yahoo.com, constantinlogofatu@yahoo.com, busuioc_stefania@yahoo.com, apazaida@yahoo.com, georgianaa.dumitrache@yahoo.com, adrianrider91@yahoo.com, berbecaru2ciceron@yahoo.com
Keywords:
MWCNT, composite materials, XPS investigations,. electric and dielectric measurements
Abstract:
Composite materials are of special interest in applications due to the combined effect of the properties of constituents in order to obtain materials with desired characteristics. In the present work, multiwall carbon nanotubes (MWCNT) were used to tailor the properties of resins and silicon rubber (SR).
Commercially available MWCNT were used to prepare composites with different carbon content.
Raman and Fourier Transform Infrared Spectroscopy (FTIR) were employed to investigate the chemical changes in composites versus pure components. The Raman and FTIR spectra of the SR and MWCNT-SR composite, displays the characteristic peaks of both materials suggesting a weak interaction between the components of mixture. Low concentrations of functionalized MWCNT (fMWCNT) significantly influence the bonds, as evidenced by FTIR measurements performed on resin-fMWCNT composites.
Dielectric measurements show significant changes of permittivity and losses with increasing fMWCNT content in resin versus to the pure resin matrix due to strong interactions. Permittivity and losses are subject to moderate changes in SR-MWCNT composites versus pure SR, due to weak interactions between constituents.
DC electrical measurements showed increased values of conductivity with increasing carbon content in resin-fMWCNT composites, with a percolation threshold of about 0.5 wt. % fMWCNT.
XPS investigations of MWCNT show the characteristic peaks of C, carbonyl, impurities bonded with C and defects. Composites materials, displays modified energies of bonds in the XPS spectra, due to the interactions of the constituents.
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