Adsorption Characteristics Of Powders Of Nanometric Gallium Nitride And Aluminum Nitride
ADSORPTION CHARACTERISTICS OF POWDERS OF NANOMETRIC GALLIUM NITRIDE AND ALUMINUM NITRIDE
L. Czepirski1, J. F. Janik1, E. Komorowska – Czepirska1, R. L. Wells2
1University of Mining and Metallurgy, Faculty of Fuels and Energy,
al. Mickiewicza 30, 30-059 Cracow, Poland
2Duke University, Department of Chemistry, Durham, NC 27708, USA
Thermal conversion of suitable chemical precursors subject to efficient elimination and condensation reactions, may yield various materials forms of a number of ceramic and semiconducting materials. Nanocrystalline nitrides, sulfides and oxides of metals can be produced as fibers, whiskers, aerosol powders, foams, thin films, and high surface area solids. In this regard, the syntheses and conversion of group 13-15 (III-V) precursors have been developed since the resulting products are very important for modern application.
Presented are results of studies on new precursors for preparation of gallium nitride and aluminum nitride.
Transamination/deamination reactions afforded a new polymeric gallium imide, [Ga(NH)3/2]n which was converted at appropriate temperature to nanocrystalline powders of GaN.
Similarly, nanocrystalline powders of AlN were obtained from thermal decomposition of aluminum amide-imide, [Al(NH)2NH]n.
Samples obtained were characterized by argon adsorption at 77K. Variation of porous structure parameters with pyrolysis temperature is discussed.
Selectivity of adsorption with respect to some gase (nitrogen, oxygen, methane, carbon dioxide at 298K) were also investigated. Data are analyzed using generalized form of Langmuir adsorption isotherm.
Related articles::