淡江大學機構典藏:Item 987654321/114229
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 62830/95882 (66%)
造访人次 : 4036897      在线人数 : 609
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/114229


    题名: 利用第一原理拉曼計算探究二維氮化硼/石墨烯異質結構之層狀堆疊與層間作用強度
    其它题名: Probing the layer stacking and interlayer coupling in 2D BN/graphene heterostructures using first-principles Raman calculations
    作者: 陳俊瑋;Chen, Jun-Wei
    贡献者: 淡江大學物理學系碩士班
    薛宏中
    关键词: 2維材料;氮化硼/石墨烯異質結構;密度泛函微擾理論;聲子能譜;拉曼光譜;Raman intensity;phonon;two-dimensional;rigid-Layer;hBN;Graphene;heterostructure;DFPT
    日期: 2017
    上传时间: 2018-08-03 14:45:49 (UTC+8)
    摘要: 在2004年Andre Geim的研究團隊在偶然的情況下,重複使用膠帶黏貼石墨,使之撥離出單層石墨烯(Graphene)的樣品,且在觀測石墨烯後,發現了許多令人驚豔的物理性質,因而吸引許多科學家投入對二維材料的探索。為了探究二維新穎材料的基礎特性,我們將以第一原理密度泛函微擾理論,計算單、雙層石墨烯及單、雙層與多層氮化硼以及氮化硼/石墨烯異質結構,其電子結構、晶格的振動模式及拉曼光譜。
    本篇論文首先介紹密度泛函理論(Density Functional Theory)與密度泛函微擾理論(Density Functional Perturbation Theory),並說明拉曼光譜的理論基礎與第一原理計算方法。接著模擬計算石墨烯與氮化硼六角結構單層與雙層系統,也探討單層氮化硼結構中,聲子LO-TO 分裂 (Longitudinal Optical-Transverse Optical splitting)效應,並通過多層結構探討層間作用力。此外,我們也研究氮化硼/石墨烯異質結構的穩定堆疊結構、電子結構及晶格振動特性。
    我們藉由計算低頻剛體層狀振動模式之頻率,估計層狀結構中之層間作用力強度大小,進而發現氮化硼/石墨烯異質結構層間之作用強度,比為氮化硼層大。而在異質結構中,因為層間耦合作用較弱,導致高頻區聲子模態,明顯由個別原子層所主導,此一特性,亦說明異質結構之聲子能譜,可視為單層氮化硼聲子與單層石墨烯聲子之組合,惟其主要相異處,在於光支頻低頻區的聲子模態,對應於相異原子層間之相對運動。
    Graphene is considered the foundation of exciting new science in two-dimensional layered materials. However, the zero-band-gap properties limit its applications in building nano-optoelectronic devices. Recently, monolayer hexagonal boron nitride (BN), a layered material similar to graphene, has been synthesized successfully as a two-dimensional dielectric or substrate material for graphene based electronics. Further van der Waals heterostructures, composed of various isolated graphene-like atomic layers, extend a wide range of novel device designs.
    In this thesis, we study the electronic structures, vibrational properties, and interlayer interaction of few-layer hBN and hBN/graphene nanostructures by carrying out first-principles total energy calculations and Raman calculations within the framework of Density Functional Perturbation Theory(DFPT). We find high-frequency intralayer vibrations of these layered materials are dominated by each individual layer which is originated from the weak interlayer coupling. Furthermore, based on DFPT and spring model calculations, we find the interlayer interaction of few-layer hBN/graphene heterostructure is stronger than that of few-layer hBN nanosheets.
    显示于类别:[物理學系暨研究所] 學位論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    index.html0KbHTML252检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈