AVS 47th International Symposium
    Electronics Tuesday Sessions
       Session EL-TuP

Paper EL-TuP9
Nanocrystalline Diamond and Nano-carbon Structures Produced using a High Argon Concentration in Hot-filament CVD

Tuesday, October 3, 2000, 5:30 pm, Room Exhibit Hall C & D

Session: Poster Session
Presenter: A.C. Peterlevitz, Universidade Estadual de Campinas, Brazil
Authors: V. Baranauskas, Universidade Estadual de Campinas, Brazil
A.C. Peterlevitz, Universidade Estadual de Campinas, Brazil
H.J. Ceragioli, Universidade Estadual de Campinas, Brazil
S.F. Durrant, Universidade Estadual de Campinas, Brazil
Correspondent: Click to Email
Nanocrystalline diamond and nano-carbon structures in the form of wires have been grown by the introduction of argon at high concentrations (60 % to ~ 99.5 % vol. Ar) into the feed mixture (ethanol and hydrogen) of a hot-filament CVD reactor. Besides the chemical inertness of argon, its presence in the gas phase changes the kinetics of the carbon deposition process. The addition of argon induces an increase in the density of vacancy defects in the diamond structure, increases the flaws between the grains, the porosity of the films, and forms new carbon structures. The range of concentration of argon used in this work is very interesting since it covers the phase transition between porous diamond ( ~60 % vol. Ar) and carbon nanowires ( ~ 99.5 % vol. Ar). A critical discussion of the growth kinetics and morphological data obtained by scanning electron microscopy (SEM), micro-photoluminescence and micro-Raman spectroscopy are discussed.