Abstract
This paper presents a cyclic catalyst pretreatment process to improve the CNF yield with narrow size distribution by sequentially feeding the CVD reactor with CH4/CO2 mixtures (carbon deposition) and CO2 (carbon removal) prior to the actual growth process. A mechanism based on a break-up of large Ni particles tentatively explains the beneficial effect of the cyclic carbon deposition/removal CVD procedure. A cyclic catalytic CVD process for the one-step production of CNFs from CH4/CO2 mixtures is presented. Successive carbon deposition/removal cycles in CO2 rich conditions lead to high quality CNFs with narrow size distribution.
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