ic7b01088_si_001.pdf (1.71 MB)
Molecular Precursors for ZnO Nanoparticles: Field-Assisted Synthesis, Electrophoretic Deposition, and Field-Effect Transistor Device Performance
journal contribution
posted on 2017-06-09, 11:48 authored by Rudolf
C. Hoffmann, Shawn Sanctis, Jörg J. SchneiderZinc
complexes with multidentate Schiff base ligands are suitable
precursors for ZnO in microwave-assisted transformation reactions.
[Bis(acetylacetonato)ethylenediimine]zinc(II) and [bis(methylacetoacetato)ethylenediimine]zinc(II)
have been synthesized with high purity and good yield from the direct
reaction of the respective diimine ligand with diethylzinc in tetrahydrofuran.
The thermal decay is studied by thermogravimetry coupled with online
infrared spectroscopy. The ceramization reaction in ethoxyethanol
yields stable dispersions of spherical ZnO nanoparticles with very
small particle sizes (around 5–6 nm), which can be employed
for coating and thin-film deposition processes. Field-effect transistors
(FETs) composed of thin films fabricated from these semiconducting
ZnO particles possess charge-carrier mobilities of 6.0 × 10–3 and 5.4 × 10–2 cm2/(V s) after processing at 350 and 450 °C, respectively. Electrophoretic
deposition affords dense film coatings composed of these ZnO nanoparticles
with thicknesses of 30–90 nm on ITO (indium tin oxide) glass-electrodes.
The positive ζ-potentials of the ZnO nanoparticles in these
dispersions are in agreement with the electrocoating process at the
cathode.