
拉曼光谱仪
纳米材料
碳纳米材料,如碳纳米管(CNT)和石墨烯具有优异的电学性能和机械性能。石墨烯(2004年在Science杂志上首次报道)是单层碳原子构成的片状材料。它可以作为其他碳材料如石墨、碳纳米管和富勒烯的基本构成单元,比如单层石墨烯可以卷曲成碳纳米管。
- Raman image of graphene, illustrating distribution of monolayer, bilayer and trilayer regions on a silicon substrate
显微拉曼光谱可以解决碳材料研究中的很多问题。在碳纳米管研究方面,可以表征管径、手性、用于评估结构是否有序以及导电性质。在石墨烯研究方面,拉曼能够快速获得层数、张/压应力等信息,并判定结构的有序性。
Hyphenation
A step further is a combination of Raman spectroscopy with Scanning Probe Microscopy (SPM) techniques. Such combination allows the user to take advantage of these two analysis methods within a single experiment platform. The colocalized Raman-SPM measurements give separate information from Raman spectroscopy (chemical characterization and imaging) and SPM (physical properties), acquired from the same region of the sample. In contrast to this, Tip Enhanced Raman Spectroscopy (TERS) measurements provide the chemical information (like Raman) with nanometer spatial resolution (like SPM). Find more information on this subject on our pages related to NanoRaman.
拉曼光谱的应用实例:
- 单根碳纳米管的定位
- 碳纳米管的管径和手性
- 新材料的纯度和质量
- 纳米管的电学性能(导体/半导体)
- 石墨烯层数
- 石墨烯的张/压应力表征
Publications
Links
- Resonant Raman spectroscopy of twisted multilayer graphene, J.B. Wu et al., Nat Commun. 5 (2014) 5309.
- Lateral epitaxial growth of two-dimensional layered semiconductor heterojunctions, X. Duan et al., Nature Nanotechnology (2014) published online.
- Anharmonic phonons in few-layer MoS 2: Raman spectroscopy of ultralow energy compression and shear modes, M. Boukhicha et al., Phys. Rev. B 87 (2013) 195316.
- Interlayer Breathing and Shear Modes in Few-Trilayer MoS2 and WSe2, Y. Zhao et al., Nano Lett. 13 (2013) 1007.
- Photoluminescence emission and Raman response of monolayer MoS2, MoSe2, and WSe2, P. Tonndorf et al., Optics Express, 21 (2013) 4908.
- Hydrostatic strain enhancement in laterally confined SiGe nanostripes, G.M. Vanacore et al., Phys.Rev.B 88 (2013) 115309.
- The thermal stability of graphene in air investigated by Raman spectroscopy, H.Y. Nan et al., J.Raman Spec. 44 (2013) 1018.
- The shear mode of multilayer graphene, P.H Tan et al., Nat. Mat. 11 (2012) 294.
- Molecular Arrangement in Self-Assembled Azobenzene-Containing Thiol Monolayers at the Individual Domain Level Studied through Polarized Near-Field Raman Spectroscopy, M. Chaigneau et al., Int J Mol Sci. 12 (2011) 1245.
- Characterization of single transition metal oxide nanorods by combining atomic force microscopy and polarized micro-Raman spectroscopy, S. Najjar et al., Chem. Phys. Lett. 514 (2011) 128.
- Polarized Raman scattering in monolayer, bilayer, and suspended bilayer graphene, S. Sahoo et al., J. Appl. Phys. 110 (2011) 044320.
- Growth of Linear Carbon Chains inside Thin Double-Wall Carbon Nanotubes, C. Zhao et al., J. Phys. Chem. C 115 (2011) 13166.
- Optical and Electrical Properties of Inner Tubes in Outer Wall-Selectively Functionalized Double-Wall Carbon Nanotubes, Y. Piao et al., Phys. Chem. Lett. 2 (2011) 1577.
- Different longitudinal optical—transverse optical mode amplification in tip enhanced Raman spectroscopy of GaAs(001), P.G. Gucciardi & J.-C. Valmalette2, Appl. Phys. Lett. 97 (2010) 263104.
Raman-AFM联用技术表征单壁碳纳米管:硅基底上碳纳米管的AFM形貌图(左上图)可以精确定位和测量纳米管的尺寸,拉曼成像(右上图,10 µm×10 µm、步长250nm)则能表征其化学信息。拉曼光谱(下图)可以看出高质量碳纳米管(红)和无序碳材料(绿)D峰和G峰有明显差异。

石墨烯的拉曼成像:G峰强度成像(左上图)和光学图像(左下图)。石墨烯较强的拉曼信号使得其化学成像可以在数秒或数分钟内完成。右边的谱图展示了石墨烯2D峰峰形与层数的关系,即使为一层、两层或三层,都可以快速地辨识出来。

单壁碳纳米管(SWCNTs)的拉曼共振活性很强。采用不同波长激光激发可以检测到不同种类碳纳米管的共振效应。上图清楚地展示了不同波长可以增强不同单壁碳纳米管的拉曼信号:混合的纳米管采用514nm、633nm、785nm和1064nm波长的激光激发,能够测得很大差异的拉曼光谱。