【摘要】：氮摻雜碳納米管的可控制備對其在場發(fā)射、能源和催化等領(lǐng)域的應(yīng)用有著重要的意義,但目前獲得低成本且高純可控的氮摻雜納米管(NCNT)的手段仍顯不足。本文采用ZnO納米棒為模板,不添加催化劑,制備NCNT,并對其進行場發(fā)射性能的測試。(1)首先采用低溫水熱法在硅基底上制備ZnO納米棒陣列,并考察了生長溫度、生長時間和生長液濃度等因素對ZnO納米棒陣列形貌的影響;由實驗結(jié)果可得:當(dāng)反應(yīng)溫度為90℃,反應(yīng)時間為6h,反應(yīng)液濃度為0.01mM時,聚乙烯吡咯烷酮(PVP)用量為0.625g·L~(-1)時,可得到長徑比較好的氧化鋅納米棒陣列;并對所得產(chǎn)物通過SEM和XRD進行表征;(2)以氧化鋅納米棒為模板制備得到NCNT,先采用吡啶作為前驅(qū)物制備得到ZnO@CNx核殼納米結(jié)構(gòu),再將此核殼納米結(jié)構(gòu)通過鹽酸浸泡后就可得到NCNT,同時還考察了生長時間對NCNT形貌的影響。研究結(jié)果表明當(dāng)吡啶流量為0.082ml·min~(-1),反應(yīng)時間為10min,氬氣流量為200 sccm,生長溫度為750℃時,所得NCNT產(chǎn)物形貌較好;并對所得產(chǎn)物通過掃描電鏡、透射電鏡和X射線光電子能譜儀進行表征;(3)將制備得到的NCNT進行場發(fā)射性能測試,得到較為優(yōu)越的場發(fā)射性能:其開啟電場為0.60 V·μm~(-1),閾值電場為2.20 V·μm~(-1);并對其進行不同壓力下(10-7~(-1)0-5Pa)的穩(wěn)定性測試,結(jié)果發(fā)現(xiàn)在350分鐘內(nèi)其波動性小于10%。
[Abstract]:The controllable preparation of nitrogen-doped carbon nanotubes is of great significance in the field of emission, energy and catalysis. However, the methods to obtain low-cost and high-purity controllable nitrogen-doped nanotubes (NCNT) are still insufficient. In this paper, ZnO nanorods were used as template, no catalyst was added to prepare NCNT, and its field emission properties were tested. (1) ZnO nanorod arrays were prepared on silicon substrates by hydrothermal method at low temperature, and the growth temperature was investigated. The effects of growth time and liquid concentration on the morphology of ZnO nanorod array were investigated. The results show that when the reaction temperature is 90 鈩，

本文編號：2463072