IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Nanometer Structures Thursday Sessions
       Session NS-ThP

Paper NS-ThP14
Growth of Spherical Diamond Tips on Small Cylindrical Substrates

Thursday, November 1, 2001, 5:30 pm, Room 134/135

Session: Poster Session
Presenter: A.C. Peterlevitz, Faculdade de Engenharia Eletrica e Computacao - UNICAMP, Brazil
Authors: V. Baranauskas, Faculdade de Engenharia Eletrica e Computacao - UNICAMP, Brazil
A.C. Peterlevitz, Faculdade de Engenharia Eletrica e Computacao - UNICAMP, Brazil
H.J. Ceragioli, Faculdade de Engenharia Eletrica e Computacao - UNICAMP, Brazil
S.F. Durrant, Faculdade de Engenharia Eletrica e Computacao - UNICAMP, Brazil
Correspondent: Click to Email
This work demonstrates the possibility of growing spherical diamond tips on the top of metallic rods using chemical vapor deposition (CVD). Spherical diamond tips are of interest for diverse applications, including micro-drilling tools, waveguides, field-emission devices, biomedical instruments and so on. A hot-filament CVD system fed with ethanol highly diluted in hydrogen was used. The nucleation and growth parameters for such spherical diamond tips differ from those for deposition on flat surfaces since there is no competition for space between the neighboring grains to growth in their preferred crystalline direction, which often results in columnar structured materials on flat surfaces. A model for scaling-down or scaling-up the diameter of the diamond tips will be presented. Morphological data obtained by scanning electron microscopy (SEM) and results of Raman spectroscopic analyses of the samples produced with different diameters are discussed.