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Chemija / Chemistry

ISSN 0235-7216
ISSN 2424-4538 (online)

2015 m. Nr. 1

Ultrasound assisted modification of graphite felt with electroless silver – Part 1: composition, morphology, structure and electrical conductivity
Brigita MACIJAUSKIENĖ, Egidijus GRIŠKONIS

The influence of ultrasound action on the modification of graphite felt with the electroless Ag was investigated. It has been gravimetrically estimated that mass fraction (wt.%) of Ag loaded on the surface of graphite felt filaments depends on the ultrasonic impact. The mass fraction of electroless-deposited Ag on the graphite felt filaments in the presence of ultrasound action is 1.6 times higher than the one of graphite felt modified without ultrasound action. The morphology, composition and structure of the internal and external filaments of graphite felt samples modified in the absence and presence of ultrasound action were determined by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD), respectively. It was found that a more uniform distribution of Ag particles in the whole volume of the graphite felt sample took place when ultrasonication of electroless Ag deposition solution was used. The nanaocrystaline Ag with an average crystallite size of 14 nm was deposited on the surface of graphite felt filaments in the absence of ultrasound action. Meanwhile, the crystallite size of electroless Ag slightly decreased to approximately 11 nm when ultrasonication was used during the deposition process. Uniform deposition of Ag particles of nanometric dimensions in the graphite felt matrix increased the electrical conductivity up to 10.7 S cm–1, and this value is about 1.6 times higher in comparison with conductivity of a bare graphite felt.

Keywords: graphite felt, modification, electroless Ag, ultrasonication, conductivity

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