RHEED and Auger study of the MoO3(010) surface interaction with H2S/H2 mixture and pure H2S |
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| Authors: | A. Steinbrunn C. Lattaud |
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| Affiliation: | Laboratoire de Recherches sur la Réactivité des Solides, LA 23, CNRS, Faculté des Sciences Mirande, BP 138, F-21004 Dijon Cedex, France |
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| Abstract: | Pure single crystals of MoO3 were carefully grown by physical vapor transport. The initial stages of the interaction of H2S with a MoO3 (010) surface were studied by RHEED and AES at low pressure p <133 Pa and at T < 700 K. Three main stages were found: (a) The formation of either a completely disordered sulphur adiayer (with pure H2S) or a superstructure MoO3(010)-[2 × 1]S (with H2S/H2). (b) A reduction of MoO3 producing oriented three-dimensional MoO2 islands, (c) An epitaxial overgrowth of MoS2 from the MoO2 three-dimensional crystallites. |
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