1D crystals of lanthanide halides of the form LnCl(3) (Ln = La, Nd, Sm, Eu,
Gd, Tb or Yb) have been inserted into single-walled carbon nanotubes (SWNT
s) using the molten salt capillary filling method; ca. 20-40% of all the ob
served SWNTs were filled with melts in the range 650-910 degreesC with no o
bservable damage to the carbon tubules; high resolution transmission electr
on microscopy (HRTEM) studies showed that the nanostructures of the encapsu
lated crystals varied with tubule diameter.