多孔石墨烯海绵边缘场发射特性研究  

Synthesis and Field Emission Property of Highly Porous Sponge-Like Graphene

作　　者：郭亚杰 狄云松[1,2] 计吉焘 张晓兵[2] 雷威[2] 郭新立[3] Guo Yajie;Di Yunsong;Ji Jitao;Zhang Xiaobing;Lei Wei;Guo Xinli(School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China;School of Electronic Science & Engineering, Southeast University, Nanjing 210096, China;School of Material Science & Engineering, Southeast University, Nanjing 211189, China)

机构地区：[1]南京师范大学物理科学与技术学院,南京210023 [2]东南大学电子科学与技术学院,南京210096 [3]东南大学材料科学与技术学院,南京211189

出　　处：《真空科学与技术学报》2019年第7期604-608,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：石墨烯由于具有良好的电子输运和发射特性,使得近年来在石墨烯及其衍生物的场发射特性方面取得了许多研究成果。然而,石墨烯通常在平面基底上制备,这在很大程度上影响了石墨烯的开启场和场增强因子,从而抑制了它的场发射。在此基础上,提出了一种独特的三维多孔海绵状结构石墨烯。本文采用化学气相沉积法制备了石墨烯发射体的多孔结构,介绍了多孔海绵状石墨烯的制备工艺、后处理及表征,并对其场发射特性进行了测试。实验结果表明,在发射电流密度为10μA/cm^2的情况下,可以获得1.8V/μm的开启场,同时根据场发射实验结果可以计算出超过50000的超高场增强因子。Highly porous sponge like graphene(SLG) was synthesized by chemical vapor deposition with sponge nickel as template.Pure SLG was obtained after etching away the nickel frameworks with hydrochloride acid solution.The influence of the SLG microstructures on the field emission properties was investigated with X-ray diffraction,scanning electron microscopy and Raman spectroscopy.The preliminary results show that the multilayered SLG,grown on sponge nickel,displayed good field emission properties,particularly after mechanical polishing.To be specific,the ultrahigh field enhancement factor of SLG was calculated to be over 50000;and a field emission current density of 10 μA/cm^2 was achieved at an on-set field of 1.8 V/μm,possibly because of the high density of protruding emission spots on the SLG stepped surface.

关 键 词：场发射 石墨烯海绵 镍海绵 

分 类 号：TN16[电子电信—物理电子学] O613.71[理学—无机化学] TB383.4[理学—化学]