Zettl (cont.)
BN tubes are transparent because they are insulating.
Do they electrically conduct? Yes, at higher (10-100 V) voltages!
Theoretical prediction: there is free e- gas inside the hollow core!
Possibility of bandgap engineering in BN NTs by an external transverse electric field.
Peapod: C60@DW BNNT. Fairly easy to make. TEM picture shows peas not only in one row as for SWCNT but in a crystalline phase.
Comment (Loiseau): Their tubes are not 2 wall, but 1 W!