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Related Concept Videos

Carbon-13 (¹³C) NMR: Overview01:10

Carbon-13 (¹³C) NMR: Overview

Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

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Published on: April 28, 2016

Raman frequency shift in oxygen-functionalized carbon nanotubes.

Z X Guo1, J W Ding, Y Xiao

  • 1Department of Physics, Xiangtan University, Xiangtan 411105, Hunan, People's Republic of China.

Nanotechnology
|July 7, 2011
PubMed
Summary

Oxygen functionalization of single-wall carbon nanotubes (O-SWCNs) causes distinct Raman shifts. These shifts depend on coverage and adsorption, showing nonmonotonic behavior due to competing bond changes.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Single-wall carbon nanotubes (SWCNs) possess unique electronic and vibrational properties.
  • Functionalization is crucial for tailoring SWCN properties for specific applications.
  • Understanding oxygen's impact on SWCNs is key for developing advanced materials.

Purpose of the Study:

  • To investigate the geometrical, electronic, and vibrational properties of oxygen-functionalized SWCNs (O-SWCNs).
  • To analyze the influence of oxygen coverage and adsorption configuration on SWCN vibrational modes.
  • To explore the potential for observable resonance Raman effects in O-SWCNs.

Main Methods:

  • Density Functional Theory (DFT) for structural and electronic property calculations.
  • Lattice dynamics theory for vibrational property analysis.
  • Systematic variation of oxygen coverage and adsorption sites.

Main Results:

  • Coexistence of bond expansion and contraction in O-SWCNs.
  • Distinct Raman shifts observed in Radial Breathing Mode (RBM) and G modes.
  • Nonmonotonic upshift and downshift in G modes with increasing oxygen coverage due to competing bond effects.

Conclusions:

  • Oxygen functionalization significantly alters SWCN vibrational spectra.
  • Raman spectroscopy can probe oxygen coverage and adsorption configurations on SWCNs.
  • Resonance Raman effects are predicted and warrant experimental investigation.