Thermal, Raman and surface area studies of microcoiled carbon fiber synthesized by CVD microwave system

Photoluminescence and electron paramagnetic resonance studies of springlike carbon nanofibers

“…Springlike CNFs with double-helix structure 8 have become the object of much interest in biological relevance because similar morphologies do exist between deoxyribonucleic acid and CNFs. Other strategic practices of these materials could be conceived but there are only few research groups [9][10][11][12][13] that have been working on the growth of coiled carbon filaments for explicit applications. As a general practice, researchers all over the world have been synthesizing microcoiled carbon fibers using thin metal film, metal supported on fine ceramic powder, iron coated indium tin oxide ͑ITO͒, thin films of Fe, Ni, Cr, Ti, Zn, and their oxides coated on silicon or copper substrates; and studied the morphology, growth mode, and elongation lengths of the coiled nanostructures.…”

Synthesis of Helical Carbon Fibers and Related Materials: A Review on the Past and Recent Developments

“…The functional materials can be prepared at lower temperatures and for shorter times with improved properties using microwave CVD method. The main advantageous feature of this method is that there is no need for impurity element in reaction zone for the synthesis of HCFs [ 90 ]. Xie et al adopted a new approach to synthesize the micro CCFs using microwave CVD method [ 90 ].…”

Direct synthesis of micro-coiled carbon fibers on graphite substrate using co-electrodeposition of nickel and sulfur as catalysts

“…Excellent physical and chemical properties and wide applications make more and more researchers focus on synthesis of micro-coiled carbon fibers [4]. Micro-coiled carbon fibers are usually one kind of pyrolytic products prepared by pyrolyzing hydrocarocarbon compounds in the presence of transition metal particles such as iron (Fe), cobalt (Co), nickel (Ni) and their alloys in a hydrogen, nitrogen or argon atmosphere [4][5][6][7][8][9]. A small amount of sulfur (S) such as thiophene or sulfuretted hydrogen must be used as growth promoter in the process of catalytic growth [2,[10][11][12][13], but sulfur only exists on the surface of catalysts and is not dispersed inside catalyst by decomposed gas [14], and micro-coiled carbon fibers are powders obtained by the above techniques.…”