About: http://webisa.webdatacommons.org/135006312

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	This problem of how to control whether you have a metal or a semiconductor is the key stumbling block in making transistors out of carbon nanotubes, said Eric Stach, an associate professor of materials engineering at Purdue.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org