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

Details

• Personal Author:
  Chauhan D ; Dasgupta K ; Pujari A ; Schulz MJ ; Shanov VN ; Zhang G
• Description:
  This work studies synthesis of carbon nanotube (CNT) sheet using the high temperature (1400 degrees 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. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety Solvents
• Keywords:
  Additive Manufacturing Aerogel Author Keywords: FC-CVD Carbon Nanotubes Catalysts CNT Cobalt Cobaltocene Direct Spinning Ferrocene Floating Catalyst Chemical Vapor Deposition Iron Metallic Compounds Metallocene Nickel Nickelocene Sulfur Vapors Yield

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• ISSN:
  2073-4344
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  12
• Issue:
  3
• NIOSHTIC Number:
  nn:20067944
• Citation:
  Catalysts 2022 Mar; 12(3):287
• Contact Point Address:
  Devika Chauhan, Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, USA
• Email:
  chauhadk@mail.uc.edu
• Federal Fiscal Year:
  2022
• Performing Organization:
  University of Cincinnati
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Catalysts
• End Date:
  20260630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f757fe83e9bacc6d23bc4f97845947347169e94b7d1ec0f4bd39fee5d7c178429b404aba2daba83ab6e74b0f41842d2844d5a2affbb46819f2c08e4a59de5ce8
• Download URL:
  https://stacks.cdc.gov/view/cdc/230177/cdc_230177_DS1.pdf
• File Type:
  [PDF - 6.98 MB ]