Suppression of secondary electron emission on oxygen-free copper surface of reduced graphene oxide coatings prepared by electrophoretic deposition

Abstract

We proposed a new carbon coating to inhibit secondary electron emission. Graphene oxide(GO) coatings were prepared on the surface of oxygen-free copper by DC electrophoretic deposition, and reduced graphene oxide(rGO) coatings were obtained by hydrogen thermal reduction. The X-ray photoelectron spectroscopy (XPS) analysis shows that the oxygen content of the coating reduced from 26.37 at.% to 9.89 at.% after thermal reduction, The XPS and Raman analysis shows that rGO still maintained the sp2 hybrid structure. The inhibitory effect of rGO coatings on secondary electron emission was tested. It was found that the maximum total secondary electron yield (δmax) of the oxygen-free copper surface reduced from 1.38 to 1.09 after the preparation of rGO coating. The total secondary electron yield did not decrease further with the film thickness increasing when the rGO coating reached a certain thickness. Our research provides a new perspective on the preparation of carbon coatings to reduce the secondary electron yield.