Abstract
The Raman spectra of polyhedral carbon nano-onions (PCO), obtained by underwater arc discharge of graphite electrodes, are studied. While the general Raman spectrum of PCO is very similar to those of other carbon nanostructures, including spherical nano-onions, the fine structure of the G and 2D bands gives valuable information that allows using Raman spectroscopy for differentiating the PCO from other carbon structures. The interpretation of the features of the fine structure of the spectra is supported by evidences obtained by TEM.
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Notes
\({R^2} = \frac{{\sum {{{\left( {{y_{\text{fit}}} - \bar y} \right)}^2}} }}{{\sum {{{\left( {{y_{\exp }} - \bar y} \right)}^2}} }}\) where \({y_{\text{fit}}}\) and \({y_{\exp }}\) are the values of the independent variable obtained from the fitting curve and from the experimental data, respectively, and \(\bar y\) is the mean value of the experimental values.
These parameters are defined as \({\gamma_{\text{G}}} = - \frac{1}{{\omega_{\text{G}}^0}}\frac{{\partial {\omega_{\text{G}}}}}{{\partial {\varepsilon_{\text{H}}}}}\) and \({\beta_{\text{G}}} = - \frac{1}{{\omega_{\text{G}}^0}}\frac{{\partial {\omega_{\text{G}}}}}{{\partial {\varepsilon_{\text{S}}}}}\) with \({\varepsilon_{\text{H}}} = {\varepsilon_{\text{L}}} + {\varepsilon_{\text{T}}}\) and \({\varepsilon_{\text{S}}} = {\varepsilon_{\text{L}}} - {\varepsilon_{\text{T}}}\) [25].
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Acknowledgments
The authors would like to thank Dr. Angela Fasanelli of UNICAL, and Eng. Francisco Rodríguez Melgarejo of CINVESTAV-Querétaro, for their helpful assistance in Raman measurements.
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Codorniu Pujals, D., Arias de Fuentes, O., Desdín García, L.F. et al. Raman spectroscopy of polyhedral carbon nano-onions. Appl. Phys. A 120, 1339–1345 (2015). https://doi.org/10.1007/s00339-015-9315-9
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DOI: https://doi.org/10.1007/s00339-015-9315-9