Ethyne
From apm
Ethyne (also known as acetylene) with formula C2H2 is a potential resource molecule for future gemstone metamaterial on chip factories. It received especially much attention in theoretical analysis due to a few advantageous properties.
- low hydrogen content
- reactive highly unsaturated carbon-carbon triple bond
- high energy compound
Another interesting (energy devoid) resource molecule for carbon would be carbon dioxide CO2.
But it wasn't investigated in detail in the context of piezochemical mechanosynthesis as of yet (2021).