We are growing CNT by CVD using ammonia, ethylene and a catalyst (Fe). Right now we are depositing Fe like 20-30nm on top of an oxide wafer. The flow rate of C2H4 is 30sscm and ammonia 200sscm, but we are getting a height of CNT 15um at pressure 30-55. Can anyone please tell me which parameter is dominant to get a higher height, and what parameters should we change?
I think Fe thickness is too much. Normally it should be less than 5 nm. In my case, I use 2 nm thick iron and get around 500 micron size aligned CNT.
Hello Dilek, thanks for responding my answer, is height of cnt depend upon thickness of catalyst.
Search for 'water assisted CNT synthesis"... well aligned, millimeter long CNTs can be synthesized.
DOI: 10.1126/science.1104962 and many more papers on this topic from this team.
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