Controlled Geometry Formation of the Carbon Coils by the Substrate Pretreatment

Abstract

Carbon coils could be synthesized using C 2 H 2 /H 2 as source gases and SF 6 as an incorporated additive gas under thermal chemical vapor deposition system. Prior to the carbon coils deposition reaction, the supporting substrates were pretreated using various methods. Among the methods, the thermal etching pretreatment of Ni-SiO 2 substrate with SF 6 leads to the exclusive formation of the nanosized carbon coils. The diamond powders pretreatment of Si substrate gives rise to the dominant formation of the microsized carbon coils after 10 minutes reaction time. The geometry selectivity for the carbon coils in a specific pretreatment method was discussed in association with the peeled-off Ni layers by the thermal etching pretreatment with SF 6 and the remained carbon particles on Si substrate by the diamond powders pretreatment.

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

“…The distortion of helical fiber occurred randomly, indicating that the interaction between catalyst and ceramic substrate differs from graphite substrate. Park and Kim synthesized carbon coils using acetylene as carbon source and SF 6 as an incorporated additive gas by CTCVD method [ 110 ]. In this study, the supporting substrates were pretreated using various methods before carbon coils deposition reaction.…”