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Synthesis and characterization of cobalt precursors for the growth of magnetic thin films by the MOCVD method

N. D. PAPADOPOULOS1, E. ILLEKOVA2, H. S. KARAYANNI3, E. HRISTOFOROU1,*

Affiliation

  1. Laboratory of Physical Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9, Iroon Polytechniou Street, 157 80 Zografou, Athens, Greece
  2. Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
  3. Laboratory of Physical Chemistry, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou St., 157 80, Athens, Greece

Abstract

Two different organometallic precursors for Co metallization by MOCVD, namely cobalt acetylacetonate and the inclusion complex of β-cyclodextrin with cobalt iodide were synthesized in the laboratory and were characterized by means of X-Ray diffraction and differential thermal analysis. It was found that both samples were polycrystalline. The hydrated form of βdiketonates presents higher crystallinity than the anhydrous one and even higher when a few drops of NH3 along with the NaOH solution was used. The inclusion complex exhibits a highly oriented character, in contrast with its parent βcyclodextrin, with most crystal directions however remaining the same upon complexing. As it was observed by DTA, both samples partially volatized before 170 OC. Within the temperature range of 320-410 OC, oxidative decomposition of the hydrated cobalt acetylacetonate was strongly intensified. The dextrin inclusion complex may prove an innovative Co precursor for precise MOCVD applications at around 170 OC, where all easily movable crystalline waters and iodide ions have moved out. Beyond 170 OC the parent β-cyclodextrin shows remarkable thermal stability and upon complexing with cobalt acetylacetonate the latter’s thermal stability can be improved significantly..

Keywords

MOCVD, Thin films, Metallization, Cobalt precursors, Acetylacetonates, Cyclodextrins, Synthesis, Characterization.

Submitted at: March 13, 2008
Accepted at: May 14, 2008

Citation

N. D. PAPADOPOULOS, E. ILLEKOVA, H. S. KARAYANNI, E. HRISTOFOROU, Synthesis and characterization of cobalt precursors for the growth of magnetic thin films by the MOCVD method, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 5, pp. 1098-1102 (2008)