11:07 AM

1 min read
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For the first time, researchers have created a free-standing sheet of gold that is only one atom thick and named it as Goldene.

About Goldene:

  • It is the first free-standing 2D metal and is only one atom thick.
  • How is it created?
    • Researchers first sandwiched an atomic monolayer of silicon between layers of titanium carbide.
    • When they deposited gold on top of this sandwich structure, the gold atoms diffused into the material and replaced the silicon atoms, forming a trapped monolayer of gold atoms.
    • Subsequently, scientists etched away the titanium carbide layers to create a free-standing, one atom thick layer of gold.
    • This was done with the help of an age-old Japanese technique used to forge katanas and high-quality knives, using a chemical popularly known as Murakami’s reagent.
  • These sheets of goldene are roughly 100 nano metres thick (a nanometre is a billionth of a metre), approximately 400 times thinner than the thinnest commercially available gold leaf.
  • Applications
    • It can be used in the electronics industry.
    • It could also be used in carbon dioxide conversion, hydrogen-generating catalysis, selective production of value-added chemicals, hydrogen production, water purification, etc.
  • Significance: It holds promise as a great catalyst because it’s much more economically viable than thicker, three-dimensional gold.

Q1: What is Murakami's reagent?

It is an etching reagent developed for use in the investigation of the structure of iron-carbon-chromium alloys. It consists of a solution of 10 g potassium ferricyanide, 10 g potassium hydroxide, and 100 mL water.

Source: GOLDENE: A sheet of gold that is only one atom thick