锌、铅纳米线在限域条件下的熔化和结晶行为

发布时间：2018-04-30 20:55

本文选题：AAO模板 + 金属纳米线　；参考：《天津理工大学》2015年硕士论文

【摘要】：随着二十一世纪纳米科技的迅速崛起,纳电子器件也逐渐登上历史舞台发挥重要作用。作为纳电子器件的连接导线和功能元件的一维金属纳米线,其内部晶体结构和性能的调控成为人们关注的焦点。本文中旨在对通过氧化铝(AAO)模板制备的锌、铅纳米线进行高温熔化,研究其在AAO孔道限域作用下有无电场诱导下的结晶行为,为液态金属纳米材料限域作用下的结晶机理与分析提供重要数据。主要研究内容如下:首先,多孔AAO模板的制备。在浓度为0.3 mol/L的C2H2O4中,负载直流电场,通过二次氧化法,得到笔直有序的AAO模板,并且以此作为载体通过电化学沉积法制备出质量较高的锌与铅一维金属纳米线,并采用透射电子显微镜以及X-ray衍射仪等仪器,来表征样品实验前后的形貌以及结构。其次,研究在无电场作用下一维金属纳米线的熔化结晶行为。分别采用高于锌与铅纳米线熔点的温度,长时间熔化并冷却结晶。从表征结果得出:锌与铅纳米线长时间高温熔化后均出现颗粒化现象,并且随着熔化温度以及时间的增长,颗粒细化现象愈加明显,这与金属纳米线在熔化过程中形成团簇以及团簇分解有着一定关系,并且铅纳米颗粒仍然保持着一维线状结构,而锌纳米颗粒最终形成管状结构,这是由于金属锌在高温作用下热挥发的原因所致;最后,在外加电场条件下,探究对熔化的一维金属纳米线结晶行为。在较低熔化温度和短的熔化时间下锌与铅纳米线基本保持完整的一维形貌,而施加外场后金属纳米线出现一些节点,且随着电场强度的增加,金属纳米线逐步颗粒化,并最终达到颗粒细化。这表明了外加电场对于调控金属原子的结合和晶核的生长有着重要的作用。
[Abstract]:With the rapid rise of nano-technology in 21 century, nano-electronic devices are playing an important role on the stage of history. One-dimensional metal nanowires, which are the connecting conductors and functional components of nanoelectronic devices, have attracted much attention in terms of their internal crystal structure and properties. The aim of this paper is to melt zinc and lead nanowires prepared by alumina AAO-template at high temperature, and to study the crystallization behavior of zinc and lead nanowires under the action of AAO pore limitation or not under the induction of electric field. It provides important data for crystallization mechanism and analysis of liquid metal nanomaterials under limited action. The main contents are as follows: firstly, the preparation of porous AAO template. In C2H2O4 with concentration of 0.3 mol/L, a straight and ordered AAO template was obtained by second oxidation under the loading of DC electric field, and the high quality zinc and lead one-dimensional metal nanowires were prepared by electrochemical deposition. Transmission electron microscopy (TEM) and X-ray diffractometer were used to characterize the morphology and structure of the samples before and after the experiment. Secondly, the melting and crystallization behavior of one-dimensional metal nanowires without electric field is studied. Temperature higher than the melting point of zinc and lead nanowires was used for long time melting and cooling crystallization. The results show that both zinc and lead nanowires are granulated after melting at high temperature for a long time, and with the increase of melting temperature and time, the grain refinement becomes more and more obvious. This is related to the formation and decomposition of clusters in the melting process of metal nanowires and the one-dimensional linear structure of lead nanoparticles and the formation of tubular structures of zinc nanoparticles. This is due to the thermal volatilization of zinc at high temperature. Finally, the crystallization behavior of the melted one-dimensional metal nanowires is investigated under the condition of external electric field. At low melting temperature and short melting time, the zinc and lead nanowires basically maintain a complete one-dimensional morphology, while some nodes appear in the metal nanowires after the application of external field, and with the increase of the electric field strength, the metal nanowires are gradually granulated. Finally, the grain is refined. This indicates that the applied electric field plays an important role in regulating the binding of metal atoms and the growth of crystal nuclei.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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