Lead(II) halide cinnamaldehyde thiosemicarbazone complexes as single source precursors for oleylamine-capped lead sulfide nanoparticles
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Materials Science: Materials in Electronics
Abstract
Different PbX2
(X = AcO, Cl, Br, I) metal salts
were complexed to cinnamaldehyde thiosemicarbazone
ligand. The resulting complexes were characterised using
Fourier Transform Infrared spectroscopy, 1H and 13C {1H}
Nuclear Magnetic Resonance spectroscopy, elemental analysis
and thermogravimetric analysis techniques. They were
then used as single source precursors for the preparation
of lead sulfide (PbS) nanoparticles using the colloidal thermolysis
route where oleylamine is used as the passivating
agent. Each SSP is thermolysed at reaction temperatures of
190, 230 and 270 °C. Predominantly cubic-shaped PbS nanoparticles
were obtained, with an exception of the truncated
nanocubes obtained from thermolysis of the SSP prepared
from lead bromide. Varying particle sizes are obtained when
the halogen is varied, ranging from ca. 50 to 400 nm. The
optical absorbance of the PbS nanoparticles in the UV-Vis-
NIR range was found to be blue-shifted when compared to
bulk PbS.