Fabrication Of Tubes Of Diamond With Micrometric Diameters And Their Characterization

The fabrication and characterization of 'self-supporting' diamond tubes grown by chemical vapor deposition (CVD) are reported. Diamond layers were deposited onto tungsten wires with diameters of 238 μm; the tungsten cores were subsequently completely removed by etching to leave 'self-supporting' diamond tubes with a diameter of approximately 400 μm and length of 20 mm. A hot-filament CVD system fed with ethanol highly diluted in hydrogen was employed. Growth rates of 7.8 μm h-1 have been measured and incubation times >3 h have been estimated. Scanning electron microscopy of cross-sections revealed columnar structures, which terminate on sharp (111) facets on the tube's external surface. Raman spectroscopy showed that the tube structure is predominantly composed of C-C sp3 bonds, with intrinsic tensile stresses. © 2002 Elsevier Science B.V. All rights reserved.420-421151154Angus, J.C., Hayman, C.C., (1988) Science, 241, p. 913Yarborough, W.A., Messier, R., (1990) Science, 241, p. 688Corat, E.J., Trava-Airoldi, V.J., Baranauskas, V., (1998) Key Eng. Mater., 138 (1), p. 195Morrish, A.A., Glesener, J.W., Fehrenbacher, M., Person, P.E., Maruyama, B., Natishan, P.M., (1994) Diamond Relat. Mater., 3, p. 173May, P.W., Rego, C.A., Thomas, R.M., Ashfold, M.N.R., Rosser, K.N., Everitt, N.M., (1994) Diamond Relat. Mater., 3, p. 810Baranauskas, V., Ceragioli, H.J., Peterlevitz, A.C., Durrant, S.F., (2001) Thin Solid Films, 398, p. 250Baranauskas, V., Peled, A., Trava-Airoldi, V.J., Lima, C.A.S., Doi, I., Corat, E.J., (1994) Appl. Surf. Sci., 79-80, p. 129Barros, R.C.M., Corat, E.J., Ferreira, N.G., Souza, T.M., Trava-Airoldi, V.J., Leite, N.F., Iha, K., (1996) Diamond Relat. Mater., 5, p. 1323Whitfield, M.D., Savage, J.A., Jackman, R.B., (2000) Diamond Relat. Mater., 9, p. 262Zhu, W., McCune, R.R., DeVries, J.E., Tamor, M.A., Simon Ng, K.Y., (1995) Diamond Relat. Mater., 4, p. 220Shi, C.R., Avyigal, Y., Dirnfeld, S., Hoffman, A., Fayer, A., Kalish, R., (1995) Diamond Relat. Mater., 4, p. 1079Stoner, B.R., Ma, G.H.M., Wolter, S.D., Glass, J.T., (1992) Phys. Rev. B, 45, p. 11067Trava-Airoldi, V.J., Corat, E.J., Pena, A.F., Leite, N.F., Valera, M.C., Freitas, J.R., Baranauskas, V., (1996) Rev. Sci. Instrum., 67 (5), p. 1993Trava-Airoldi, V.J., Corat, E.J., Penã, A.F.V., Leite, N.F., Baranauskas, V., (1995) Diamond Relat. Mater., 4 (11), p. 125