Analysis of single-walled carbon nanotubes (SWNTs) by UV-Vis Spectroscopy (CAT#: STEM-MB-0949-WXH)

Name: Analysis of single-walled carbon nanotubes (SWNTs) by UV-Vis Spectroscopy
SKU: STEM-MB-0949-WXH
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Introduction

Single walled carbon nanotubes (SWCNTs) can be considered as a single long wrapped graphene sheet. Nanotubes generally have a length to diameter ratio of about 1000 and hence considered nearly one-dimensional structures. SWCNTs generally have a diameter close to 1 nm and are multiple thousand times longer in length.

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Principle Applications Procedure Materials

Principle

UV-Vis spectroscopy is an analytical technique that measures the amount of discrete wavelengths of UV or visible light that are absorbed by or transmitted through a sample in comparison to a reference or blank sample. This property is influenced by the sample composition, potentially providing information on what is in the sample and at what concentration. The only requirement is that the sample absorb in the UV-Vis region, i.e. be a chromophore. Absorption spectroscopy is complementary to fluorescence spectroscopy. Parameters of interest, besides the wavelength of measurement, are absorbance (A) or transmittance (%T) or reflectance (%R), and its change with time.

Applications

UV/Vis spectroscopy is routinely used in analytical chemistry for the quantitative determination of diverse analytes or sample, such as transition metal ions, highly conjugated organic compounds, and biological macromolecules. Spectroscopic analysis is commonly carried out in solutions but solids and gases may also be studied.