Surface activation process of nickel-supported monolayer graphene

Song Tang; Dongzhi Wang; Qiming Wang; Shiman Li; Feng Shi; Yijun Zhang

doi:10.1117/12.2666700

4 April 2023 Surface activation process of nickel-supported monolayer graphene

Song Tang, Dongzhi Wang, Qiming Wang, Shiman Li, Feng Shi, Yijun Zhang

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126176B (2023) https://doi.org/10.1117/12.2666700
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

Electron source can be considerably benefited from the application of photocathodes with long lifetime, broad spectral response and high quantum efficiency. As graphene has exhibited potential to serve as the passivation layer to improve electron emission behavior of photocathodes due to its unique structure and properties, exploring photoemission phenomenon of metal-supported graphene material can help to develop robust photocathodes. We report the photoemission performance of the nickel-supported monolayer graphene through various activation processes. To investigate the effects of different activation processes on this composite material, we compare the photoemission behavior of the nickel-supported monolayer graphene by cesium (Cs)-only activation at room temperature, Cs-only activation under heated condition and cesium-oxygen (Cs/O) activation under heated condition. The experimental results show that these activation methods are able to promote photoemission ability of the nickel-supported monolayer graphene. Among them, the Cs/O activation process under heated condition can improve the photocurrent most significantly. This process validation of activating the nickel-supported graphene material provides a new route to enhance photoemission performance of metal photocathodes, and the activation method could be applied to the surface modification of other metal-supported graphene materials.

Citation Download Citation

Song Tang, Dongzhi Wang, Qiming Wang, Shiman Li, Feng Shi, and Yijun Zhang "Surface activation process of nickel-supported monolayer graphene", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126176B (4 April 2023); https://doi.org/10.1117/12.2666700

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