Suppression of Secondary Electron Emission by Vertical Graphene Coating on Ni Microcavity Substrate

• Published in: Nanomaterials (Basel, Switzerland) Vol. 14; no. 15; p. 1268
• Main Authors: Zhang, Xiaoning, Tang, Bin, He, Jialong, Zhao, Hui, Wang, Ronghua, Gui, Hao, Li, Xinlu, Liu, Kefu, Shi, Jinshui, Chang, Guomei
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 29.07.2024
• Subjects: Carbon; Chemical vapor deposition; Coating; Coatings; Electric waves; Electromagnetic radiation; Electromagnetic waves; Electron emission; Electronic equipment; Electrons; Emissions; Etching; Graphene; Graphite; Laser arrays; Laser etching; Metal surfaces; Metals; microcavity array; Nickel; Particle accelerators; Plasma enhanced chemical vapor deposition; Plasma etching; Power supply; Protective coatings; Research methodology; resorption effect; secondary electron emission; Spacecraft; Spacecraft construction materials; Substrates; vertical graphene; vertical graphene; resorption effect; secondary electron emission; microcavity array; laser etching
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano14151268

Suppression of secondary electron emission (SEE) from metal surfaces is crucial for enhancing the performance of particle accelerators, spacecraft, and vacuum electronic devices. Earlier research has demonstrated that either etching the metal surface to create undulating structures or coating it with materials having low secondary electron yield (SEY) can markedly decrease SEE. However, the effectiveness of growing vertical graphene (VG) on laser-etched metal surfaces in suppressing SEE remains uncertain. This study examined the collective impact of these methods by applying nanoscale arrays of VG coating using plasma-enhanced chemical vapor deposition on Ni substrates, along with the formation of micrometer-sized microcavity array through laser etching. Comparative tests conducted revealed that the SEY of the samples subjected to VG coating on a microcavity array was lower compared to samples with either only a microcavity array or VG coating alone. Additionally, the crystallinity of VG grown on substrates of varying shapes exhibited variations. This study presents a new method for investigating the suppression of SEE on metal surfaces, contributing to the existing body of knowledge in this field.