All-Optical Structure Assignment of Individual Single-Walled Carbon Nanotubes From Rayleigh and Raman Scattering Measurements (CAT#: STEM-ST-0010-YJL)

Name: All-Optical Structure Assignment of Individual Single-Walled Carbon Nanotubes From Rayleigh and Raman Scattering Measurements
SKU: STEM-ST-0010-YJL
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Introduction

As a result of Fullerene synthesis, carbon nanotubes were discovered and thus belong to the Fullerene structural family. Carbon nano tube which is an allotrope of carbon may be defined as seamless cylinders of one or more layers of graphene which exhibits many unexpected and extraordinary thermal, mechanical and electrical properties. These single-walled carbon nanotubes are the seamless cylinders of one layer of graphene which itself is a hexagonal arrangement of carbon atoms in one plane. These single-walled carbon nanotubes often when examined have a diameter in the range of ~ 1 nm. The optical resonances of a single SWNT are identified from the Rayleigh spectra.

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Principle Applications Procedure Materials

Principle

Resonance Rayleigh scattering (RRS) is similar to Rayleigh scattering in nature. Resonance Rayleigh scattering is a special elastic scattering produced when the wavelength of Rayleigh scattering (RS) is located at or close to its molecular absorption band. The key to generating RRS is: when the scattering is at or close to the absorption band of the scattering molecule, since the electron absorbs the electromagnetic wave at the same frequency as the scattering frequency, the electron strongly absorbs the photon energy due to resonance and re-scatters. Its scattering intensity is several orders of magnitude higher than that of pure Rayleigh scattering, and it no longer obeys the Rayleigh law of I∝λ-4. This absorption-rescattering process is called resonance Rayleigh scattering (RRS).

Applications

Resonance Rayleigh scattering is used to the study of aggregation of chromophores on biological macromolecules and the determination of biological macromolecules such as nucleic acid, proteins and heparin, further, it has been used in the determination of trace amounts of inorganic ions and the cationic surfactant by means of ion association reactions with some dyes. In addition, it has been applied to the study of nanoparticles in liquid and the determination of β-cyclodextrin inclusion constant and the critical micelle concentration of surfactant.