Resumo

RAMOS, M.A. et al. Spherical MoS₂ micro particles and their surface dispersion due to addition of cobalt promoters. Rev. mex. fis. [online]. 2011, vol.57, n.3, pp.220-223. ISSN 0035-001X.

We present here a hydrothermal synthesis on spherical shape molybdenum di-sulfide (MoS₂) micro-particles using thiomolybdate salts and sodium silicate as reducing agent. To understand the role of cobalt promoters on this particular MoS₂ spherical shape a second reaction was carried out using same precursors plus addition of Co following same pressure and temperature conditions. Both products (before and after Co promoter) were characterized using scanning electron and transmission electron microscopic analysis. From SEM measurements a spherical average size diameter of ~ 2.855 µm on pure MoS₂ is observed and disperse surface once cobalt is incorporated into the reaction. From TEM observations an interlayer average distance of ~ 0.63 nm is obtained for MoS₂-MoS₂ slabs on samples with Co content. X-ray diffraction indicated principal crystallographic planes to be (002), (100), (101), (102), (103), (006), (105), and (110) for both MoS₂ and MoS₂/Co samples.

Palavras-chave : Molybdenum sulfide; cobalt; X-ray; TEM.

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