What are bands in Raman?

Raman bands of nucleic acids originate from in-plane vibrations of the nucleic acid bases (adenine, guanine, cytosine, thymine and uracil) and from the furanose-phosphate backbone. In general, Raman spectra of DNA or RNA reveal structural information about base stacking and interbase hydrogen bonding interactions.

What does a Raman spectrum tell you?

Raman Spectroscopy is a non-destructive chemical analysis technique which provides detailed information about chemical structure, phase and polymorphy, crystallinity and molecular interactions. It is based upon the interaction of light with the chemical bonds within a material.

What is 2D band in Raman?

As a result the 2D band is always a strong band in graphene even when there is no D band present, and it does not represent defects. This band is also used to determine graphene layer thickness. In contrast to the G band position method, the 2D band method depends not only on band position but also on band shape.

How do you analyze Raman?

One method of interpreting Raman spectra is the recognition of molecular functional groups, which are distinct subunits of a molecule. The vibrations of functional groups appear in Raman spectra at distinctive Raman shifts.

What is D and G band in Raman?

Raman peaks at 1350 and 1588 cm−1 for D and G bands could be observed due to the doping of rGO. The D band corresponds to scattering from local defects or disorders present in carbon, and the G bands originates from the in-plane tangential stretching of the C−C bonds in the graphitic structure.

What is G peak?

The G peak is due to the bond stretching of all pairs of sp2 atoms in both rings and chains. The D peak is due to the breathing modes of sp2 atoms in rings [13,26,34].

What does Raman intensity mean?

Physics Institute of Litoral / Faculty of Chemical Engineering. An intensity increment in a particular peak of a Raman spectrum generally indicates that the fraction of substance (maybe polymerized material in this case) in the sample contributing to that vibrational mode increased.

What is D and G peak Raman?

What is ID IG ratio?

The intensity ratio of the D and G bands i.e (ID/IG ratio) helps to estimate the defects of Gr based samples where a higher ratio ensures more defects on Gr. The calculated ID/IG ratios of r-GO, N-Gr and FeNGr2 are 1.08, 1.02, and 1.16 respectively.