In Situ Heating TEM Study of Onion-like WS<SUB>2</SUB> and MoS<SUB>2</SUB> Nanostructures Obtained via MOCVD

Chem. Mater., 20 (1), 65–71, 2008. 10.1021/cm061867k
Web Release Date: December 11, 2007

In Situ Heating TEM Study of Onion-like WS₂ and MoS₂ Nanostructures Obtained via MOCVD

Nicole Zink,^† Helen Annal Therese,^† Julien Pansiot,^† Aswani Yella,^† Florian Banhart,^‡ and Wolfgang Tremel^*^†

Institut für Anorganizche Chemie and Analytische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55099 Mainz, Germany, and Institut für Physikalische Chemie, Johannes Gutenberg-Universität Mainz, Welderweg 11, D-55099, Mainz, Germany

Received August 8, 2006

Revised Manuscript Received March 26, 2007

Abstract:

We report on the in situ heating transmission electron microscopy (TEM) study of WS₂ and MoS₂ nanoparticles obtained from metal–organic chemical vapor deposition (MOCVD). The general behavior of MoS₂ and WS₂ is similar: Round, amorphous particles in the pristine sample transform to hollow, onion-like particles upon annealing. A second type of particle with straight layers exhibits only minor changes. A significant difference between both compounds could be demonstrated in their crystallization behavior. The results of the in situ heating experiments are compared to those obtained from an ex situ annealing process under Ar.

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