Archaeological Scientists have discovered the oldest known human-made nano-materials dated 600 BC in Tamil Nadu. They were unearthed in the “unique black coatings” of ancient pottery shards from an archaeological site in Keeladi. The scientists who participated in unearthing said that the coatings are the oldest nano-structures discovered till now.
The study published recently in the journal Scientific Reports revealed that the discovered coatings were made up of carbon nanotubes. They have enabled the layer to last more than 2600 years. This discovery by the scientists including researchers of Vellore Institute of Technology (VIT) in Tamil Nadu has been raising questions on the tools used during those periods to achieve high temperatures for making earthenwares.