Abstrace Carbon nanotubes (CNTs) are excellent materials for field emission because of their large aspect ratio, low-threshold field and stable chemical structure. However, the low adhesive bonding strength between CNTs and the supports presents a practical challenge in environments with a high field emission current density. We used a vacuum filtration method to prepare multiwalled CNT (MWCNT)/reduced grapheme oxide (r-GO) composite films in which CNTs were uniformly dispersed in the r-GO layers. Compared with unmodified films, films in which CNTs are dispersed show better field emission performance, and the adhesive bonding strength between the CNTs and the supports is enhanced. At the same time, because MWCNTs grown by chemical vapor deposition (CVD) contain impurities such as carbonaceous materials and catalyst particles, we use different purification methods to treat the MWCNTS, and the effects of these purification methods on the field emission properties of the composite films are analyzed. A comparison of the field emission properties of the unpurified, calcined, calcined/centrifuged and acid-purified composite films shows that the calcined/centrifuged composite films have the best field emission performance.

中文翻译：

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纯化方法对碳纳米管与石墨烯复合薄膜截面场发射性能的影响

Abstrace 碳纳米管 (CNT) 具有大的纵横比、低阈值场和稳定的化学结构，是一种优良的场发射材料。然而，碳纳米管和支撑体之间的低粘合强度在具有高场发射电流密度的环境中提出了实际挑战。我们使用真空过滤方法制备多壁碳纳米管（MWCNT）/还原氧化石墨烯（r-GO）复合膜，其中碳纳米管均匀分散在 r-GO 层中。与未改性薄膜相比，分散有碳纳米管的薄膜显示出更好的场发射性能，并且增强了碳纳米管与支撑体之间的粘合强度。同时，由于化学气相沉积（CVD）生长的多壁碳纳米管含有碳质材料和催化剂颗粒等杂质，我们使用不同的纯化方法对多壁碳纳米管进行处理，并分析了这些纯化方法对复合薄膜场发射性能的影响。比较未纯化、煅烧、煅烧/离心和酸纯化复合膜的场致发射性能，表明煅烧/离心复合膜的场致发射性能最好。