It's made through chemical exfoliation.
“Chemical exfoliation offers another route toward monolayers, with the advantage that it accesses large quantities, which can then be processed into printable inks, moving studies from the laboratory setting to potential industrial applications, especially if the synthesized ink is stable in air,” stated the authors in their paper.
The new method will allow researchers to print very cold circuits inside quantum computers using superconducting ink. The new material consists of layers of tungsten disulfide and potassium that has been dunked into a sulfuric acid solution in order to be exfoliated. This dissolved the potassium and left behind single-molecule layers of tungsten disulfide that were then rinsed in acid.
The end result is layers of tungsten disulfide that could be used as a form of ink that could be printed onto various types of surfaces, such as plastic, silicon, or glass, as a one-molecule-thick coating. Their solution was quite stable, holding up at room temperature without the need for a protective coating for 30 days. Furthermore, cooling it to 7.3K made the coating superconductive.
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