| 查看: 7513 | 回复: 140 | ||||||||||||||||||||||||
| 【奖励】 本帖被评价132次，作者zxs1989增加金币 104.6 个 | ||||||||||||||||||||||||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | ||||||||||||||||||||||||
[资源]
加州大学水浒分校Haddon在Acc Chem Res最新综述，关于石墨烯和碳纳米管
|
||||||||||||||||||||||||
|
UCR的Robert Haddon教授曾首次预测并发现碱金属掺杂C60的超导性质，他也是纳米碳材料领域的大牛之一。在最新一期的Acc Chem Res上，他的小组发表了一篇名为Effect of Covalent Chemistry on the Electronic Structure and Properties of Carbon Nanotubes and Graphene的综述（Vol. 46, No. 1, 2013, 65-76），长达12页，内容非常有特色，基本上是围绕他本人研究组的三方面工作，参考文献仅53篇。不像一般的综述，涵盖面广而不精。虽然他的研究组也做应用研究，但是从本文可以看出其理论功底之深厚。 摘要如下： In this Account, we discuss the chemistry of graphitic materials with particular reference to three reactions studied by our research group: (1) aryl radical addition, from diazonium precursors, (2) Diels–Alder pericyclic reactions, and (3) organometallic complexation with transition metals. We provide a unified treatment of these reactions in terms of the degenerate valence and conduction bands of graphene at the Dirac point and the relationship of their orbital coefficients to the HOMO and LUMO of benzene and to the Clar structures of graphene. In the case of the aryl radical addition and the Diels–Alder reactions, there is full rehybridization of the derivatized carbon atoms in graphene from sp2 to sp3, which removes these carbon atoms from conjugation and from the electronic band structure of graphene (referred to as destructive rehybridization). The radical addition process requires an electron transfer step followed by the formation of a σ-bond and the creation of a π-radical in the graphene lattice, and thus, there is the potential for unequal degrees of functionalization in the A and B sublattices and the possibility of ferromagnetism and superparamagnetism in the reaction products. With regard to metal functionalization, we distinguish four limiting cases: (a) weak physisorption, (b) ionic chemisorption, in which there is charge transfer to the graphitic structure and preservation of the conjugation and band structure, (c) covalent chemisorption, in which there is strong rehybridization of the graphitic band structure, and (d) covalent chemisorption with formation of an organometallic hexahapto-metal bond that largely preserves the graphitic band structure (constructive rehybridization). The constructive rehybridization that accompanies the formation of bis-hexahapto-metal bonds, such as those in (η6-SWNT)Cr(η6-SWNT), interconnects adjacent graphitic surfaces and significantly reduces the internanotube junction resistance in single-walled carbon nanotube (SWNT) networks. The conversion of sp2 hybridized carbon atoms to sp3 can introduce a band gap into graphene, influence the electronic scattering, and create dielectric regions in a graphene wafer. However, the organometallic hexahapto (η6) functionalization of the two-dimensional (2D) graphene π-surface with transition metals provides a new way to modify graphitic structures that does not saturate the functionalized carbon atoms and, by preserving their structural integrity, maintains the delocalization in these extended periodic π-electron systems and offers the possibility of three-dimensional (3D) interconnections between adjacent graphene sheets. These structures may find applications in interconnects, 3D-electronics, organometallic catalysis, atomic spintronics and in the fabrication of new electronic materials.      [ Last edited by zxs1989 on 2013-2-11 at 15:39 ] |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com - 附件 1 : EffectofCovalentChemistryontheElectronicStructureandPropertiesofCarbonNanotubesandGraphene.pdf
2013-02-11 15:35:09, 2.81 M
» 收录本帖的淘帖专辑推荐
 资源收集 | 先进材料 | 科研资料 | 石墨烯与碳纳米管 |
| 文献推荐 | 电化学电源、电源管理 | 石墨烯碳纳米管技术顶级参考 | 无机纳米材料 |
| 材料综述 | 石墨烯量子点 | Graphene | 高分子复合材料 |
| 碳相关（石墨烯，碳纳米管等） | 纳米材料 | 实验分析方法 | 纳米材料（MECHANISM) |
| 碳纳米管 | 低维碳材料—石墨烯等 | 感觉有用的帖子 | 复合材料相关 |
| 纳米 | 经典论文集 |
» 猜你喜欢
求助一篇MEMS散热器件文献
已经有0人回复
-
材化专业SCI论文（职称评定）
已经有0人回复
-
金属材料论文润色/翻译怎么收费?
已经有96人回复
-
材料化学专业SCI论文（职称评定）
已经有0人回复
» 本主题相关商家推荐: (我也要在这里推广)
» 本主题相关价值贴推荐，对您同样有帮助:
- 不孤单的石墨烯-2 综述
已经有133人回复
- Acc Chem Res 最新综述 : 石墨烯发展的安全顾虑 - 碳纳米管的教训
已经有249人回复
- 硼掺杂石墨烯或碳纳米管的实验合成条件
已经有15人回复
- 目前关于碳纳米管增强金属基复合材料较全的一篇综述
已经有201人回复
5楼2013-02-11 21:57:19
简单回复
2013-02-11 16:33
回复
五星好评 顶一下，感谢分享！
2013-02-11 18:14
回复
五星好评 顶一下，感谢分享！
2013-02-11 18:44
回复
五星好评 顶一下，感谢分享！
2013-02-12 03:21
回复
五星好评 顶一下，感谢分享！
lwg37楼
2013-02-13 14:03
回复
五星好评 顶一下，感谢分享！
jackxun8楼
2013-02-13 22:31
回复
五星好评 顶一下，感谢分享！
2013-02-14 06:28
回复
五星好评 顶一下，感谢分享！
xldongcn10楼
2013-02-14 07:16
回复
五星好评 顶一下，感谢分享！
firechen98711楼
2013-02-14 10:26
回复
五星好评 顶一下，感谢分享！
aiang10712楼
2013-02-14 13:49
回复
五星好评 顶一下，感谢分享！
yourmoon13楼
2013-02-14 14:07
回复
五星好评 顶一下，感谢分享！
yangshu69214楼
2013-02-14 16:23
回复
顶一下，感谢分享！
