Carbon nanotubes and nanofibers synthesized by CVD on nickel coatings deposited with a vacuum arc

ESCOBAR, MARIANO; GIULIANI, LEANDRO; CANDAL, ROBERTO; LAMAS, DIEGO; CASO, ALVARO; RUBIOLO, GERARDO; GRONDONA, DIANA; GOYANES, SILVIA; MARQUEZ, ADRIANA

JOURNAL OF ALLOYS AND COMPOUNDS

ELSEVIER SCIENCE SA

Año: 2010 vol. 445 p. 446 - 449

0925-8388

Nanotubes and nanofibers were grown on Ni coatings deposited by plasma generated with a pulsed vacuum arc on silicon wafers using three different bias conditions: at floating potential (approximately +30V respect to the grounded cathode); at ground potential; and at -60V An atomic force microscopy study showed that the Ni film morphology was affected by the bias condition of the substrate. The morphology of carbonaceous species depended on Ni-films characteristics FE-SEM and TEM analyses have shown that nanofibers growth was favoured on Ni coatings deposited at -60V whereas nanotubes grew mainly on Ni coatings obtained at floating and ground potentials Hence, this new method to produce the precursor can be optimized to obtain nanotubes or nanofibers varying the substrate bias for the Ni deposition