Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Michał Woluntarski"

The analysis of LIBS spectra of graphene and C/Herex/C composite DOI:10.15199/28.2018.5.1

  1. INTRODUCTION LIBS (Laser Induced Breakdown Spectroscopy) method consists in heating and evaporating (ablation) of a material with the use of a laser pulse and generating a plasma emitting both continuum and line radiation. Analysis of line radiation emitted by plasma allows to identify elements existing in the tested specimen. After focusing a laser beam on the specimen surface, a slight amount of the material is subjected to ablation and, as a result of laser radiation absorption, generates a plasma wherein it is possible to observe spectral lines of the elements evaporated from the specimen surface, the analysis of which enables obtaining of qualitative information on a chemical composition of the tested specimens [1, 2]. The paper presents a use of laser spectroscopy LIBS to identify materials and chemical composition of materials containing nanostructure of carbon. The results proved evident emission of molecular impurities of CN and C2 resulting from a number of carbon layers and hybridization of carbon atoms in a binding molecule. The authors of work [3, 4], considering investigations of Swan type carbon bands, indicate a necessity for precise theoretical calculations of emission spectra. The experimental tests proved that in the case of most of the measurements the results were compliant with a theory in the expected ranges of parameters for the resolution of temperature,background and spectrum. There were observed certain discrepancies resulting from temperature differences between band 504 to 517 and 550 to 564 mm at the delays of registration from 10 to 100 μs after a laser pulse. It was also observed that a standard deviation between the measured and the calculated bands is compliant with a lower temperature [4]. 2. THE AIM AND RESEARCH METHODS An experiment aimed at determining a chemical composition of a specimen of graphene paper and carbon composite was conducted with Laser Induced Breakdown Spectrosco[...]

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