Go to ... Complete Reference | Help | Logoff
Australian National University Catalogue
[Press ALT and TAB to move between the Ovid database and the Library Catalogue]

Citation 1

Accession Number

006742852

Author

Rode AV. Gamaly EG. Elliman RG. Kheifets AS. Luther-Davies B.

Institution

Res. Sch. of Phys. Sci. & Eng., Australian Nat. Univ., Canberra, ACT,
Australia.

Title

Cluster-assembled amorphous carbon nano-foam synthesised by high-pulse-rate
laser ablation.

Source

AIP. American Institute of Physics Conference Proceedings, no.486, 1999,
pp.196-9. USA.

Conference Information

Electronic Properties of Novel Materials - Science and Technology of
Molecular Nanostructures. 13th International Winterschool. Kirchberg,
Austria. Aventi Res. & Technol. AVL LIST GmbH. BRUKER Analytischer
Messyechnik GmbH. et al. 27 Feb.-6 March 1999.

Abstract

We report on a new fractal amorphous carbon nano-foam with a large fraction of tetrahedrally-bonded atoms. The material was produced by high-repetition-rate laser ablation in an argon atmosphere which resulted in a high collision frequency between carbon atoms and ions in the laser plume and argon atoms in the chamber. This creating the optimal vapour temperature and density for the efficient formation of 4-membered sp/sup 3/ bonds typical of diamond. The bulk density of various foam samples is in the range (2-10).10/sup -3/ g/cm/sup 3/, whilst the specific surface area is 300-400 m/sup 2//g comparable to that of carbon aerogels. At low temperatures the as-deposited foam exhibits a strong positive electrostatic charge and nonlinear current-voltage characteristics with strong hysteresis, indicative its insulating nature. After annealing, the resistivity of the foam measured at low voltage (+or-30 V) is (1-3).10/sup 9/ Ohm.cm at room temperature and (1-10).10/sup 13/ Ohm.cm at 80 K, with virtually no hysteresis. The DC conductivity of this low-density carbon foam and its temperature dependence appears to be very close to that of RF-sputtered solid amorphous diamond-like carbon films. (10 References).

---