Morphological Phase Diagram of Gadolinium Iodide Encapsulated in Carbon Nanotubes

Abstract

The melt phase encapsulation of gadolinium iodide (GdI 3) in small internal diameter carbon nanotubes (CNT) was explored to understand how the tubular structure of the host could chemically stabilize a hygroscopic metal halide. However, given the distribution of diameters in the as-received CNTs, the final sample consisted of mixed encapsulation products. These varied from the mono-elemental iodine chain to the atomic layer deposition of the binary halide. Supported by density functional theory calculations, these observations led to the proposition of a morphological phase diagram for GdI 3 encapsulation in CNTs as a function of the host's internal diameter.

An overview of the recent advances in inorganic nanotubes

“…70 In a related work this group has laser ablated PbI 2 (and ZnI 2 ) in the presence of CNT mesh, obtaining core-shell single wall PbI 2 @CNT nanostructures in high yields. 72 Similarly, 73 a complex series of core-shell nanostructures were obtained by annealing layered GdI 3 in the presence of CNT mesh. In the case of double wall CNT with open end and hollow core of only 0.3 nm, pure iodine nanowires were encapsulated.…”

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