Calorimetric and Positron Lifetime Measurements οf Hydrogenated Carbon Nanocones |
| A. Budziaka, J. Dryzeka, b, J. Krawczyka and P.M. Zielińskia
a Institute of Nuclear Physics PAN, E. Radzikowskiego 152, 31-342 Kraków, Poland b Institute of Physics, University of Opole, Oleska 48, 45-052 Opole, Poland |
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| Two carbon nano-structured samples containing 5 and 20% of carbon nanocones in their volume were investigated. Using the Sieverts apparatus the hydrogen was loaded into the samples. The measurements of heat capacity in the temperature range from 100 K to 320 K and the positron lifetime measurements at the room temperature were performed for hydrogenated and non hydrogenated carbon nanocones. The desorption of hydrogen at the temperature of 230 K is deduced from the heat capacity measurements. The detection of the positronium, the bound state of positron and electron, in the measured samples reveals the presence of open volume defects of ca. 0.198 ± 0.002 nm. |
| DOI: 10.12693/APhysPolA.117.574 PACS numbers: 81.05.U-, 78.70.Bj |