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Редактор Л.В. Шаронова Spectral ellipsometry of nanodiamond composite S.G. Yastrebov, S.K. Gordeev, M. Garriga+, M.I. Alonso+, V.I. Ivanov-Omskii Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia FSUE Central Research Institute for Materials“, ” 191014 St. Petersburg, Russia + Institute de Ciencia de Materials de Barcelona, CSIC 08193 Bellaterra, Spain
Methods of spectral ellipsometry were applied for analysis of optical properties of nanodiamond based composite in spectral region 1.4-5 eV characteristic for - optical transitions in amorphous carbon. The nanocomposite was synthesized by molding of ultradispersed nanodiamond powder in the course of heterogeneous chemical reaction of decomposition of methane, forming pyrocarbon interconnecting nanodiamond grains. Spectral dependencies of imaginary and real parts of dielectric functions were restored. It is demonstrated that imaginary part of the dielectric function may be represented as sum of two components caused by two kinds of - optical transitions. Maximal contributions of first and second types of transitions are developed for energies 2.6 and 5.6 eV, correspondingly, that gives peaks in optical density at 3 and 6 eV. These peculiarities of normalized optical density coincide practically with main features of poly(para-phenylenevinylene) spectra. The energy of + plasmon of pyrocarbon component of nanodiamond composite was restored which proves to be 24 eV; using this value, an estimation was done of pyrocarbon matrix density, which occurres to be 2g/cm3. The last value coincides absolutely with one restored from experimental dependence of the material porosity versus total mass of synthesized pyrocarbon matrix. Exploiting conception of optimal fill of elemental unit with carbon atoms, forming amorphous carbons of this density, an allotropic content of pyrocarbon matrix was restored.
Физика и техника полупроводников, 2006, том 40, вып.