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Observation of D band splitting in vertically aligned graphene nanowalls and their evolution with laser power during Raman spectroscopy

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Abstract

Splitting of D band is observed in vertically aligned graphene nanowalls (VAGNWs) during analysis of Raman spectroscopy for the first time and two distinct peaks were observed, designated as D1 and D2. Evolution of D band with increasing laser power is studied and it is seen that intensity and full width at half maxima (FWHM) of D2 get reduced with increasing laser power. ID/IG values of deposited VAGNWs showed a decreasing trend with increasing laser power indicating that defects have slightly reduced with increasing laser power. It is also observed that D/ peak at high laser power almost merged with G peak like highly defective graphene sheets. Defect analysis showed that all the samples have high degree of stage 2 defect. Interestingly, no splitting was observed in G/ band by increasing laser power and VAGNWs kept their turbostratic nature intact through this peak.

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Authors and Affiliations

  1. Laser & Plasma Technology Division, Mumbai, 400085, India

    Rajib Kar & Namita Maiti

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  1. Rajib Kar
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  2. Namita Maiti
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Correspondence to Rajib Kar.

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Kar, R., Maiti, N. Observation of D band splitting in vertically aligned graphene nanowalls and their evolution with laser power during Raman spectroscopy. J Nanopart Res 23, 4 (2021). https://doi.org/10.1007/s11051-021-05147-y

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  • DOI: https://doi.org/10.1007/s11051-021-05147-y

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