Tungsten Disulfide Nanotubes



 Tokyo Metropolitan University has published in the journal Nano Letters. The team has made a tungsten disulfide nanotube. For the first time, the nanotubes point in the same direction as when formed. A sapphire surface was used to form the tungsten disulfide nanotubes, employing chemical vapor deposition. 

 Nanotubes are made up of sheets of atoms. The atoms are rolled into a nanoscale tube. This turns a two-dimensional sheet into a one-dimensional tube.

The tubes properties depend on the way the ends of the sheet meet together. Carbon nanotubes can either be conducting or semiconducting if there is a twist in the structure when rolled up.

Tungsten disulfide nanotubes are made up of nanosheets that are rolled multiple times. They are known to be semiconducting no matter which way they are rolled.

The problem with real world applications is it would require a specified amount of nanotubes in the same place. This is possible, but the tubes point in random directions. No matter how interesting the effects, the properties of multiple nanotubes is equivalent to a jumbled pile.

Professor Kazuhiro Yanagi is from the Tokyo Metropolitan University. His team is tackling this problem by using a sapphire substrate. Together with a specific crystalline plate, the team is able to grow nanotubes.  Amazing.

The team fed glass that contained sulfur and tungsten to the substrate using chemical vapor deposition. It formed built-walled rolled tungsten disulfide nanotubes on the surface of the sapphire. The team noticed that all the nanotubes pointed along a certain crystallographic direction. This is the first time arrayed tungsten disulfide nanotubes were grown in a laboratory. 


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