The synthesis of PbF₂nanorods in a microemulsion system

Abstract

Single-crystalline PbF 2 nanorods with a diameter of 100-500 nm and length of 1-10 μm have been successfully synthesized by a simple sonochemical route in a microemulsion system at room temperature. The morphologies and structures of the nanorods were characterized by x-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy. The experimental results showed that polyethylene glycol 6000 played an important role in the formation of PbF 2 nanorods. Room-temperature photoluminescence measurements indicated that the as-prepared PbF 2 nanorods had strong green emission, which could have potential applications in optoelectronic devices.

Phase transition process and luminescent properties of undoped and Dy3+ ion doped orthorhombic PbF2 prepared by a hydrothermal method

“…Sample 1 # with F/Pb ratio of 2.5 showed a pure α-PbF 2 crystalline structure (according to JCPDS card no. 06-0288), similar results could be found in references [5][6][7][8]. When the F/Pb ratio was increased to 5 (Figs.…”

“…Xu et al successfully synthesized octahedral and wheat like α-PbF 2 microcrystal by a sonicationmicroemulsion method. When polyethylene glycol 6000 (PEG-6000) was added, perfect nanorod like α-PbF 2 was obtained [8].…”

“…3, undoped α-PbF 2 shows green emission with a peak of 516 nm, under excitation of 365 nm. The luminescent properties of α-PbF 2 has been ascribed to the formation of (Pb 2 ) 3 þ electronic centers by many researchers [1,[5][6][7][8], caused by strong covalent interaction between the two nearest neighbor Pb 2 þ ions, and there should be a void (positron) left for charge neutralization. The emission spectra in Fig.…”

“…Among the recent research work [5][6][7][8], the preparation of α-PbF 2 with various morphology by a simple hydrothermal method at low temperature, seems much more meaningful. Zhu et al successfully prepared α-PbF 2 microrod and microtubes by adjusting CTAB (Cetyl Trimethyl Ammonium Bromide) and acetic acid content, as well as F/Pb ratio.…”

Electrochemical Synthesis of Octahedral Nanostructured PbF2

“…Xu et al demonstrated that α-PbF 2 nanorods can be prepared via a sonochemical route in microemulsion system and the structure exhibits strong green emission. 7 More recently, Xu has showed that octahedral PbF 2 can be produced by the sonochemical method based on oriented attachment process. 8 More recently, Zhu et al have demonstrated that β-PbF2 microsphere and α-PbF 2 microrods with different size can be controllably fabricated by hydrothermal methods.…”