场电子发射
石墨烯
材料科学
拉曼光谱
化学气相沉积
纳米技术
碳纳米纤维
等离子体增强化学气相沉积
纳米结构
薄膜
光电子学
碳纳米管
电子
光学
物理
量子力学
作者
Rajib Kar,Shreya Ghatak Sarkar,L. Mishra,Rashmi Tripathi,D. C. Kar,Rajiv O. Dusane,D.S. Patil,Namita Maiti
标识
DOI:10.1016/j.diamond.2023.110134
摘要
Graphene nanowalls (GNWs) also known as carbon nanowalls (CNWs) and GNWs‑carbon nanofibers (CNFs) hybrid nanostrucrures are grown on metallic wires using a two-step microwave plasma enhanced chemical vapour deposition (MW-PECVD) process. Here, plasma is generated in two steps (first at lower pressure and then at higher operating pressure) to avoid arcing on the metallic wire during the growth. Combination of Raman and transmission electron microscopy studies revealed presence of herringbone CNFs in the hybrid nanostructures that are grown with −100 V bias compared to pristine GNWs that are grown without any bias. A new approach for field emission (FE) analysis is created by combining FN equation with 'orthodoxy test' in a modified approach to avoid spurious results. Here, hybrid nanostructures exhibited higher current and more repeatable field emission characteristics over 4 cycles of operation. Post FE investigations indicate that while pristine GNWs underwent many deformities and structural changes, hybrid structures remain almost unscathed. These investigations point out that a novel synthesis mechanism can be used to grow GNW based hybrid nanostructures for different applications like X-ray sources which involves FE at the core.
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