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Significantly Reduced Secondary-Electron-Yield of Aluminum Sheet with Fluorocarbon Coating

State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
National Key Laboratory of Science and Technology on Space Microwave, China Academy of Space Technology (Xi’an), Xi’an 710100, China
Author to whom correspondence should be addressed.
Coatings 2018, 8(7), 249;
Received: 3 June 2018 / Revised: 11 July 2018 / Accepted: 13 July 2018 / Published: 16 July 2018
PDF [3237 KB, uploaded 18 July 2018]


In this work, the surface of Al sheet was coated with a fluorocarbon (FC) thin film by radio frequency (RF) sputtering of polytetrafluoroethylene (PTFE) to investigate the influence of dielectric coatings on the secondary electron yield (SEY) behavior of Al sheets. Atomic-force microscopy (AFM) and energy-dispersive spectroscopy (EDS) were employed to identify the surface topographies and elemental contents of the samples with FC coatings. Water contact angle (WCA) measurements were performed to characterize the surface tension as well as the polar and dispersion components of the samples’ surface. The secondary electron- mission (SEE) behavior of the samples was determined by measuring the SEY coefficients in an ultra-high vacuum chamber with three electron guns. The experimental results indicated that the longer sputtering time effectively led to the increase in coating thickness and a higher ratio of F/C, as well as the continued decrease of surface tension. A quite thin FC coating of about 11.3 nm on Al sheet resulted in the value of maximum SEY (δmax) dropping from 3.02 to 1.85. The further increase in coating thickness beneficially decreased δmax down to 1.60, however, at the cost of a ten-fold thicker coating (ca. 113 nm). It is found that increasing the coating thickness contributes to reducing SEY coefficients as well as suppressing SEE. The results are expected to guide the design of dielectric-coating for SEY reduction as well as multipactor suppression on Al. View Full-Text
Keywords: fluorocarbon coating; aluminum sheet; magnetron sputtering; secondary electron yield fluorocarbon coating; aluminum sheet; magnetron sputtering; secondary electron yield

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Wang, F.; Zhao, Q.; Li, J.; Wang, K.; Huang, Z.; Cui, W. Significantly Reduced Secondary-Electron-Yield of Aluminum Sheet with Fluorocarbon Coating. Coatings 2018, 8, 249.

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