Field Emission from Cylindrical Graphene Cathodes Prepared by Chemical Vapor Deposition and Cold Rolling

Details

• Personal Author:
  Back T ; Cahay M ; Fang Q ; Hernandez N ; Kondapalli VKR ; Ludwick J ; Marzana M ; Piovesan Azambuja R ; Raut A ; Shanov V
• Description:
  We report field emission (FE) properties of cold cathodes made by a scalable chemical vapor deposition synthesis of three-dimensional graphene (3DG) from a cast catalyst followed by cold rolling. This process leads to an increase in mechanical strength and electrical conductivity of the tested material. For a given distance between the tip of the cathode and the anode, it is found that the FE current from the edge of a single sheet of cold-rolled 3DG-based cathode can be increased by over one order of magnitude when rolling the 3DG sheet in the shape of a cylinder with several turns. A FE current in the order of 4.5 mA was measured from a 3 mm diameter cold-rolled 3DG cylinder with six turns at a bias of 2400 V for a separation of 0.5 mm between the tip of the cylindrical cathode and the anode. The FE data of all cold-rolled 3DG-based cathodes are well fitted by the expression proposed by Abbot, Henderson, Forbes, and Popov [Filippov et al., R. Soc. Open Sci. 9, 220748 (2022)], Im = CVmkexp(-B/Vm), where Im is the FE current, Vm is the bias applied between the cathode and anode, and B and C are fitting parameters. It is found that k = 1 and 3/2 for FE from the surface and edge of the cold-rolled based cathodes, respectively. [Description provided by NIOSH]
• Subjects:
  Chemistry Occupational Health Safety Solvents
• Keywords:
  Chemical Analysis Electrical Conductivity Electron Microscopy Graphene Nanomaterials Vapors
• ISSN:
  0021-8979
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Chicago Region [OSHA] ; Ohio
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  136
• Issue:
  19
• NIOSHTIC Number:
  nn:20070354
• Citation:
  J Appl Physi 2024 Nov; 136(19):195107
• Email:
  cahaymm@ucmail.uc.edu
• CAS Registry Number:
  Graphite (CAS RN 7782-42-5)
• Federal Fiscal Year:
  2025
• Performing Organization:
  University of Cincinnati
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Journal of Applied Physics
• End Date:
  20260630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:eb2fe376e862317d9b28ae4e6ab67907a99430635c45b7d74920b1ca1e2ed3837eac5545470f1d5ace0cc757c0d12cdea9fb4af8226aad9fa7a0380a6ddbe5d2
• Download URL:
  https://stacks.cdc.gov/view/cdc/208586/cdc_208586_DS1.pdf
• File Type:
  [PDF - 5.78 MB ]