模板法制备Ti纳米螺旋管及温度的影响

发布时间：2018-04-03 11:08

本文选题：碳纳米线圈　切入点：螺旋结构　出处：《大连理工大学》2015年硕士论文

【摘要】：随着纳米科技的不断发展和成熟,人们越来越希望在纳米尺度下按照自己的意愿去制造各种形态不同的材料。碳纳米线圈(CNC)由于其特殊的螺旋结构,一直是人们研究的重点。其中,可以利用碳纳米线圈做母体,对其进行填加、包敷和结构限制处理,可制备另一种一维纳米螺旋结构的材料。本文以碳纳米线圈的螺旋结构为外壳,镀上Ti金属(因为其光学性质比较突出),再将其碳结构去除,就会制备出这种金属材料的纳米级螺旋管。由于金属材料对光的复数折射,通过螺旋管的激光就会产生更加复杂的光学现象(如偏振现象)。这对于纳米级的光学研究是很有意义的,同时也为这种Ti纳米螺旋管作纳米级的光波导打下了夯实的基础。其中碳结构的去除是最为关键的。文章选用的是高温氧化的方法,即在空气的环境下,将镀Ti的碳纳米线圈放入高温炉中进行升温氧化。但如何在保证高温处理后,螺旋结构的完整,金属Ti不被氧化以及确定碳元素完全被氧化,这是一组相互矛盾的问题。因此找到一个最佳的温度调控方案是本文的主要研究目的。文章的第一章先介绍了一下课题研究的背景,主要是介绍了有关碳纳米管、碳纳米线圈、纳米光学、纳米光波导、金属等离子体波导和金属Ti的一些基本相关信息和知识,着重阐述了文章研宄的重要意义。文章的第二章通过碳纳米材料的热重曲线分析和样品Ti的拉曼光谱,分析得出了高温氧化的温度范围,并选择580。C作为后面实验的温度上限。而文章的前两章,主要是为后面高温氧化法制备Ti纳米螺旋管作实验前的准备。文章的第三章主要是描述制备Ti纳米螺旋管的实验部分。先利用化学气相沉积(CVD)的方法在碳纳米线圈镀上120nm厚的Ti。再放入高温炉中,通过温度的调控(主要是升温速度和恒温加热时间),将样品进行氧化。之后利用Raman光谱检测其样品的碳氧化程度,利用SEM观测其结构是否完整。最后,通过这几组样品的Raman光谱和SEM图像的分析得出一个制备完美螺旋管的合适方案。在文章的最后一章,作者在实验中发现一个非常有趣的现象,即升温速度越慢,Ti的氧化程度越小。作者对这种现象给出两种解释,并希望给后面的研究指出新的方向。
[Abstract]:With the development and maturity of nanotechnology, more and more people hope to produce different materials in nanometer scale according to their own wishes.Carbon nanocoils (CNC) have been the focus of research because of their special helical structure.Among them, carbon nanocoils can be used as parent materials, which can be filled, encapsulated and confined by structure, and another kind of one-dimensional nano-helical materials can be prepared.In this paper, the spiral structure of the carbon nanocoils is taken as the outer shell, and Ti metal is plated (because of its outstanding optical properties), and then the carbon structure is removed, the nanohelical tubes of this metal material will be prepared.Because of the complex refraction of light by metal materials, the laser passing through the helical tube will produce more complicated optical phenomena (such as polarization phenomenon).This is of great significance to the optical research of nanometer scale, and it also lays a solid foundation for this kind of Ti nanotubes to be used as nanoscale optical waveguides.The removal of carbon structure is the most important.In this paper, the method of high temperature oxidation is chosen, that is, the carbon nanocoils coated with Ti are placed in a high temperature furnace to be heated and oxidized in air.However, how to ensure the integrity of spiral structure after high temperature treatment, the non-oxidation of Ti and the determination of complete oxidation of carbon are a set of contradictory problems.Therefore, the main purpose of this paper is to find an optimal temperature control scheme.The first chapter introduces the background of the research, mainly introduces some basic information and knowledge about carbon nanotubes, carbon nanocoils, nano-optics, nano-optical waveguides, metal plasma waveguides and metal Ti.The important significance of the research of the article is expounded emphatically.In the second chapter, the temperature range of high temperature oxidation is obtained by thermogravimetric analysis of carbon nanomaterials and Raman spectrum of Ti sample, and 580.C is selected as the upper limit of the later experiment.The first two chapters are mainly prepared for the preparation of Ti nanotubes by high temperature oxidation.The third chapter mainly describes the experimental part of the preparation of Ti nanohelical tubes.First, the 120nm thick Ti was deposited on the carbon nanocoils by chemical vapor deposition (CVD) method.Then the sample is oxidized by the control of temperature (mainly heating rate and heating time at constant temperature).The degree of carbon oxidation of the samples was measured by Raman spectroscopy, and the structure of the samples was observed by SEM.Finally, through the analysis of Raman spectra and SEM images of these groups of samples, a suitable scheme for preparing perfect spiral tubes is obtained.In the last chapter of the paper, the author finds an interesting phenomenon in the experiment, that is, the slower the heating rate is, the smaller the oxidation degree of Ti is.The author gives two explanations for this phenomenon and hopes to point out a new direction for the later study.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;O614.411

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