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Article

Effect of a Metallocene Catalyst Mixture on CNT Yield Using the FC-CVD Process

1
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, USA
2
Materials Group, Bhabha Atomic Research Centre, Mumbai 400085, India
*
Authors to whom correspondence should be addressed.
Academic Editors: Thurid Gspann and Adarsh Kaniyoor
Catalysts 2022, 12(3), 287; https://doi.org/10.3390/catal12030287
Received: 7 October 2021 / Revised: 24 February 2022 / Accepted: 28 February 2022 / Published: 3 March 2022
This work studies synthesis of carbon nanotube (CNT) sheet using the high temperature (1400 °C) floating catalyst chemical vapor deposition (FC-CVD) method. Three metallocenes—ferrocene, nickelocene, cobaltocene—and their combinations are used as precursors for metal catalysts in the synthesis process. For the carbon source, an alcohol fuel, a combination of methanol and n-hexane (9:1), is used. First, the metallocenes were dissolved in the alcohol fuel. Then, the fuel mixture was injected into a tube furnace using an ultrasonic atomizer with Ar/H2 carrier gas in a ratio of about 12/1. The synthesis of CNTs from a combination of two or three metallocenes reduces the percentage of metal catalyst impurity in the CNT sheet. However, there is an increase in structural defects in the CNTs when using mixtures of two or three metallocenes as catalysts. Furthermore, the specific electrical conductivity of the CNT sheet was highest when using a mixture of ferrocene and cobaltocene as the catalyst. Overall, the multi-catalyst method described enables tailoring certain properties of the CNT sheet. However, the standard ferrocene catalyst seems most appropriate for large-scale manufacturing at the lowest cost. View Full-Text
Keywords: FC-CVD; floating catalyst chemical vapor deposition; carbon nanotubes; aerogel; direct spinning; yield; metallocene; ferrocene; nickelocene; cobaltocene; sulfur; iron; nickel; cobalt FC-CVD; floating catalyst chemical vapor deposition; carbon nanotubes; aerogel; direct spinning; yield; metallocene; ferrocene; nickelocene; cobaltocene; sulfur; iron; nickel; cobalt
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MDPI and ACS Style

Chauhan, D.; Pujari, A.; Zhang, G.; Dasgupta, K.; Shanov, V.N.; Schulz, M.J. Effect of a Metallocene Catalyst Mixture on CNT Yield Using the FC-CVD Process. Catalysts 2022, 12, 287. https://doi.org/10.3390/catal12030287

AMA Style

Chauhan D, Pujari A, Zhang G, Dasgupta K, Shanov VN, Schulz MJ. Effect of a Metallocene Catalyst Mixture on CNT Yield Using the FC-CVD Process. Catalysts. 2022; 12(3):287. https://doi.org/10.3390/catal12030287

Chicago/Turabian Style

Chauhan, Devika, Anuptha Pujari, Guangqi Zhang, Kinshuk Dasgupta, Vesselin N. Shanov, and Mark J. Schulz. 2022. "Effect of a Metallocene Catalyst Mixture on CNT Yield Using the FC-CVD Process" Catalysts 12, no. 3: 287. https://doi.org/10.3390/catal12030287

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