基于氧化锌模板法制备氮掺杂碳纳米管及其场发射性能的研究
发布时间：2019-04-22 18:11
【摘要】：氮掺杂碳纳米管的可控制备对其在场发射、能源和催化等领域的应用有着重要的意义,但目前获得低成本且高纯可控的氮掺杂纳米管(NCNT)的手段仍显不足。本文采用ZnO纳米棒为模板,不添加催化剂,制备NCNT,并对其进行场发射性能的测试。(1)首先采用低温水热法在硅基底上制备ZnO纳米棒阵列,并考察了生长温度、生长时间和生长液浓度等因素对ZnO纳米棒阵列形貌的影响;由实验结果可得:当反应温度为90℃,反应时间为6h,反应液浓度为0.01mM时,聚乙烯吡咯烷酮(PVP)用量为0.625g·L~(-1)时,可得到长径比较好的氧化锌纳米棒阵列;并对所得产物通过SEM和XRD进行表征;(2)以氧化锌纳米棒为模板制备得到NCNT,先采用吡啶作为前驱物制备得到ZnO@CNx核壳纳米结构,再将此核壳纳米结构通过盐酸浸泡后就可得到NCNT,同时还考察了生长时间对NCNT形貌的影响。研究结果表明当吡啶流量为0.082ml·min~(-1),反应时间为10min,氩气流量为200 sccm,生长温度为750℃时,所得NCNT产物形貌较好;并对所得产物通过扫描电镜、透射电镜和X射线光电子能谱仪进行表征;(3)将制备得到的NCNT进行场发射性能测试,得到较为优越的场发射性能:其开启电场为0.60 V·μm~(-1),阈值电场为2.20 V·μm~(-1);并对其进行不同压力下(10-7~(-1)0-5Pa)的稳定性测试,结果发现在350分钟内其波动性小于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，
本文编号：2463072
[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，
本文编号：2463072
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