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Volume 91 Issue 26 | p. 20 | Concentrates
Issue Date: July 1, 2013

Easy Route To Conductive Nanosheets

Simple synthesis yields highly conductive nanosheets of tungsten diselenide, which is useful in many high-tech applications
Department: Science & Technology
News Channels: Materials SCENE, Nano SCENE
Keywords: tungsten diselenide, WSe2, dichalchogenide
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A simple solution-phase method yields high-quality nanosheets of WSe2 (W is white; Se is yellow)
Credit: Chem. Mater.
This is a rendition of WSe2 sheets.
 
A simple solution-phase method yields high-quality nanosheets of WSe2 (W is white; Se is yellow)
Credit: Chem. Mater.

The class of materials called metal dichalcogenides—which includes compounds such as MoS2, WSe2, and TaS2—finds use in numerous high-tech applications. Examples include transistors, capacitors, batteries, catalysts, and hydrogen storage materials. Nanostructured versions of these compounds can be more stable chemically and exhibit better electronic properties than their bulk counterparts. They might find even broader applications if they weren’t typically prepared via laborious methods such as sputtering, chemical vapor deposition, and electrodeposition. University of Southern California chemists may have come up with an attractive solution. Priscilla D. Antunez, David H. Webber, and Richard L. Brutchey have demonstrated a simple solution-phase method to prepare highly conductive WSe2 nanosheets (Chem. Mater. 2013, DOI: 10.1021/cm400790z). The team reacted di-tert-butyl diselenide with WCl4 in dodecylamine and treated the product with a surfactant to prevent the crystallites from agglomerating. The group reports that the high-yield method produces “phase pure” samples that exhibit conductivity values typical of samples prepared by painstaking methods.

 
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