Surface Modifications of Carbon Fibers with Different Graphitization Indexes to Produce Cu/Carbon Fiber Composites by Electroless Process by Ferreira NG* in Trends in Textile Engineering & Fashion Technology_ Textile Science Engineering Journal
Abstract
Copper/carbon
fiber (Cu/CF) composites by electroless Cu deposition were studied on carbon
fibers (CF) produced at three different heat treatment temperatures (HTT) of
1000, 1500, and 2000 °C. The HTT control led to different CF graphitization
indexes that influenced their chemistry
surfaces. As a consequence, the electrochemical and chemical pre-treatments of
the CF played distinct role by forming different oxygen functional groups also
influencing the Cu deposition. CF substrates as well as Cu/CF composites were
analyzed by Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR),
X-ray diffraction, and scanning electron microscopy. FTIR results revealed that
both pre-treatments promoted CF surface modifications concerning the OH
stretching vibrations for the three HTT studied. Nonetheless, the OH stretching
vibration was more intense for all electrochemically pre-treated CFs. Moreover,
the C-O and C=O stretching vibrations also appeared for the electrochemically
pre-treated CF1000. Cu electroless deposition showed a strong dependence on the
CF microstructure acquired
after the HTT as well as on the pre-treatment step. The electrochemical
pre-treatment was mandatory to obtain metallic Cu deposits on CF substrates.
Regarding the nitrate electrochemical reduction, Cu/CF composites obtained from
electrochemically treated CFs showed the nitrate reduction to nitrite followed
by ammonia formation
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