Issue 15, 2004
From the journal:

Physical Chemistry Chemical Physics

How stable are inorganic fullerene-like particles? Thermal analysis (STA) of inorganic fullerene-like NbS2, MoS2, and WS2 in oxidizing and inert atmospheres in comparison with the bulk material†

Christoph Schuffenhauer,a   Gerhard Wildermuth,b   Jürgen Felsche*b  and  Reshef Tenne*a  

* Corresponding authors

a Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, Israel
E-mail: Reshef.Tenne@weizmann.ac.il
Fax: +972 8 934 4138
Tel: +972 8 934 2394

b Department of Chemistry, University of Constance, Konstanz, Germany
E-mail: Juergen.Felsche@uni-konstanz.de
Fax: +49 7531 88 3142
Tel: +49 7531 88 2025

Abstract

Two-dimensional compounds (like graphite or MoS2) are capable of bending their layers and forming a closed cage structure, which is denoted the inorganic-fullerene-like (IF) phase in the case of inorganic materials. Simultaneous thermal analysis (TG-DTA) of a number of nanomaterials (IF-MoS2, IF-NbS2, and IF-WS2) and their bulk counterparts was carried out in inert and oxidizing environments at various heating rates. Oxidation occurred at 295 °C for the smallest particle size (100 nm) but the oxidation temperature increased to 440 °C for the largest particle size (3 μm). At low heating rates, the oxidation occurred through sulfates and lower oxides, while at high heating rates mostly one-step oxidation to the highest oxide was observed. The stability in N2 atmosphere depended on the criterion of stability chosen: Choosing the onset temperatures of the decomposition step (between 1200 °C and 1390 °C), the stability decreased in the order WS2 ≈ MoS2 > NbS2; and the bulk material reacted mostly at higher temperatures compared to the IF-phase. Choosing the extent of decomposition as a measure of stability, no specific trend could be found. Surprisingly, a single IF-WS2 sample was found to be most stable by both methods.This study shows that IF nanoparticles are comparably (though somewhat less) stable against oxidation as well as decomposition than the bulk material exhibiting the usual plate-like structure.

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Article information

DOI
https://doi.org/10.1039/B401048E
Article type
Paper
Submitted
22 Jan 2004
Accepted
14 May 2004
First published
03 Jun 2004

Phys. Chem. Chem. Phys., 2004,6, 3991-4002

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How stable are inorganic fullerene-like particles? Thermal analysis (STA) of inorganic fullerene-like NbS2, MoS2, and WS2 in oxidizing and inert atmospheres in comparison with the bulk material

C. Schuffenhauer, G. Wildermuth, J. Felsche and R. Tenne, Phys. Chem. Chem. Phys., 2004, 6, 3991 DOI: 10.1039/B401048E

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