Photophysical Studies of Nanocarbons

技术支持：该项目涉及三个相关的研究领域：双壁碳纳米管，单壁碳纳米管中的共振窗口和石墨烯研究。单个双壁纳米管的系统共振拉曼研究计划沿着几个研究方向-四个DWNT配置的互补研究，以调查电荷转移行为和应变效应，努力区分DWNT中存在的每个机制的作用。还将研究与上述现象相关的壁到壁距离。单壁碳纳米管的拉曼光谱中特征的共振窗口，注意每个光谱特征的直径和手性角依赖性的影响，以及对于（2n+m）族的M-SWNT和S-SWNT已经揭示的影响。该项目还包括合作研究，以改善单层，双层和少层石墨烯样品的CVD大面积生长的合成工艺。用于表征各种石墨烯的主要工具将是D带、G带和G 0带，关于层数和结构顺序，特别强调层间堆叠。将CVD生长的石墨烯的拉曼光谱中的所有特征的行为与通过高取向热解石墨（HOPG）的机械剥离产生的样品进行比较。系统的CVD石墨烯拉曼研究将对由麻省理工学院的Jing Kong小组生长的样品进行，并由合作者M. Endo和Y. A. Kim在日本长野的信州大学工作。还将对石墨烯带的边缘进行拉曼研究，以努力清楚地区分扶手椅边缘和锯齿边缘之间的差异。非技术性：该项目解决了材料科学和凝聚态物理与技术相关性的专题领域的基础研究问题，预计将为跨学科领域的研究生和本科生培训提供独特的机会。通过培训这一研究领域的男女领导人，通过邀请演讲和出版物广泛传播这一研究成果，以及通过编写指导评论文章将这一工作的成果与这一研究领域的其他最新工作联系起来，预计这一研究项目也将产生更广泛的影响。PI将继续通过邀请普通观众，工业实验室和专业协会的演讲向公众传播纳米科学和纳米技术的进步，就像她过去所做的那样。她在许多大学为学生和博士后举办辅导班的服务预计将继续下去，她对专业协会的服务也将继续下去。该项目由DMR电子材料和凝聚态物理计划共同支持。

Technical: This project addresses three related research areas: double wall carbon nanotubes, resonance windows in single wall carbon nanotubes, and graphene studies. A systematic resonance Raman study of individual double wall nanotubes is planned along several research directions--complementary studies for the four DWNT configurations to investigate charge transfer behavior and strain effects with an effort to distinguish between the role of each of the mechanisms present in DWNTs. A study of the wall to wall distances associated with the above phenomena will also be investigated. Resonance windows of features in the Raman spectra of SWNTs, paying attention to effects of the diameter and chiral angle dependence, of each spectral feature, and to the effects that have been revealed for (2n+m) families of M-SWNTs and S-SWNTs. The project also includes collaborative research to improve the synthesis process for CVD large area growth of monolayer, bi-layer and few layer graphene samples. The main tool used to characterize the various graphenes will be the D-band, G-band and G0-band, regarding layer number and structural order, with special emphasis given to interlayer stacking. The behavior of all features in the Raman spectra for CVD grown graphene will be compared with samples produced by the mechanical exfoliation of highly oriented pyrolytic graphite (HOPG). Systematic Raman studies of CVD graphene will be carried out for samples grown by Jing Kong's group at MIT and annealed at a variety of temperatures in the range 1500-2800±C by collaborators Professors M. Endo and Y. A. Kim at Shinshu University in Nagano, Japan. Raman studies of the edges of graphene ribbons will also be carried out in an effort to clearly distinguish the differences between armchair and zigzag edges. Non-technical: The project addresses basic research issues in a topical area of materials science and condensed matter physics with technological relevance, and is expected to provide unique opportunities for graduate and undergraduate training in an interdisciplinary field. This research project is also expected to have broader impacts through the training of women and men leaders in this research field, through the wide dissemination of the findings of this research through invited talks and publications and through the preparation of tutorial review articles to relate the findings of this work together with other state-of-the-art work in this research field. The PI will continue to disseminate advances in nanoscience and nanotechnology to the public through invited talks to general audiences, industrial laboratories and professional societies, as she has done in the past. Her service in holding mentoring sessions for students and postdocs at numerous universities is expected to continue, as is her service to professional societies. This project is co-supported by the DMR Electronic Materials and Condensed Matter Physics Programs.