Abstract
Absorption coefficient of graphite bulk pressed from 1 to 5 μm-sized crystalline grains was measured in UV–Vis–NIR range with three different methods: (i) determination of pulsed laser ablation rate as the function of laser fluence for different wavelengths (248, 337, 532, and 1064 nm, respectively); (ii) production of aerosol particles by UV laser ablation of the bulk graphite in inert atmosphere and determination of the mass-specific absorption coefficient with a four-wavelength (266, 355, 532, and 1064 nm, respectively) photoacoustic spectrometer, and (iii) spectroscopic ellipsometry in 250–1000 nm range. Taking into account the wide range of the absorption coefficients of different carbon structures, an overall relatively good agreement was observed for the three methods. The ellipsometric results fit well with the ablation rate measurement, and the data obtained with photoacoustic method are also similar in the UV and NIR region; however, the values were somewhat higher in visible and near-UV range. Taking into account the limitations of the methods, they can be promising candidates for the determination of absorption coefficient when the samples are strongly scattering and there is no possibility to perform transmissivity measurements.
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Acknowledgements
This work was supported by the GINOP-2.3.2-15-2016-00036 and by the European Union, co-financed by the European Social Fund EFOP-3.6.1-16-2016-00014.
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Smausz, T., Kondász, B., Gera, T. et al. Determination of UV–visible–NIR absorption coefficient of graphite bulk using direct and indirect methods. Appl. Phys. A 123, 633 (2017). https://doi.org/10.1007/s00339-017-1249-y
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DOI: https://doi.org/10.1007/s00339-017-1249-y