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X‐ray Powder Diffraction Study of Molybdenum Oxides Formed From the Thermal Reactions of MoS 2 , MoS 2 / LiF , and MoS 2 /Ag in Air
Author(s) -
Lee SoRam,
Kim Youhyuk
Publication year - 2020
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.12136
Subject(s) - molybdenum , molybdenum trioxide , orthorhombic crystal system , inert gas , inert , scanning electron microscope , materials science , powder diffraction , diffraction , chemistry , inorganic chemistry , crystallography , analytical chemistry (journal) , crystal structure , organic chemistry , physics , optics , composite material
MoS 2 can generate useful molybdenum oxides by thermally reacting with LiF or Ag nanoparticles (NPs). MoS 2 easily loses sulfide and reacts with oxygen gas upon heating in air to give orthorhombic molybdenum trioxide, α‐MoO 3 . Morphological changes of α‐MoO 3 from 500 to 900°C were investigated using X‐ray powder diffraction and scanning electron microscope. The strong diffraction peaks of the (020), (040), and (060) planes at 800°C revealed highly anisotropic growth of the oxides with a layered crystal structure. In the presence of LiF, MoS 2 reacts with oxygen gas to generate Li 2 MoO 4 and MoO 2 , depending on the LiF concentration. In the presence of Ag NPs, the thermal reactions of MoS 2 at 800 and 900°C give silver molybdates Ag 2 Mo 2 O 7 and Ag 2 MoO 4 , respectively. These results demonstrate that MoS 2 is an important precursor for generating useful molybdenum oxides on the surface of inert substrates without requiring sophisticated, expensive equipment.