About: http://webisa.webdatacommons.org/69162246

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	However, obtaining contrast from a material that is only one atom thick and made from a light element such as carbon is very challenging.
http://www.w3.org/ns/prov#wasQuotedFrom	royalsociety.org