Synthesis and characterization of nanocrystalline RuO_2 powders

摘要

The synthesis of nanocrystalline RuO_2 powders by combining "wet" chemical precipitation, autoclaving and thermal treatment of amorphous precursors has been investigated. Amorphous RuO_2 precursors were precipitated from RuNO(NO_3)_3 or RuCl_3 solutions by adding NH_4OH solution up to approx pH 5. The samples were characterized by DTA, XRD, FT-IR spectroscopy and TEM. The control of particle size was achieved by heating of amorphous precursor due to regular particle (crystallite) growth. Nanosized RuO_2 particles were formed up to 450 deg C. However, at 600 deg C, the size of RuO_2 particles was significantly increased.