Evaluation of hydrogen chemisorption in nanostructured carbon films by near edge X-ray absorption spectroscopy
Articolo
Data di Pubblicazione:
2005
Citazione:
Evaluation of hydrogen chemisorption in nanostructured carbon films by near edge X-ray absorption spectroscopy / C. Lenardi, M. Marino, E. Barborini, P.G.C. Piseri, P. Milani. - In: THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS. - ISSN 1434-6028. - 46:3(2005), pp. 441-447.
Abstract:
We have developed a method for the quantitative evaluation of the chemisorbed fraction of hydrogen in nanostructured carbon films using Near Edge X-ray Absorption Spectroscopy (NEXAFS). In the carbon K-edge spectrum the peak related to carbon bonded to hydrogen is assumed to be correlated with the amount of hydrogen bonded to carbon. This assumption is supported by a comparative analysis of gas-phase hydrocarbons obtained via Electron Energy Loss Spectroscopy (EELS). We applied the method to nanostructured carbon (ns-C) films synthesized by supersonic cluster beam deposition. The evaluated quantity of chemisorbed hydrogen in different samples exposed to molecular hydrogen (pressure of 0.12 MPa, for 3 hours at room temperature) is ~1.5 wt.%.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
carbon ; chemisorption ; electron energy loss spectra ; EXAFS ; hydrogen ; hydrogen bonds ; ionised cluster beam deposition ; nanostructured materials ; thin films ; XANES
Elenco autori:
C. Lenardi, M. Marino, E. Barborini, P.G.C. Piseri, P. Milani
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