Oriented Transformation from Layered Zinc Hydroxides
to Nanoporous ZnO: A Comparative Study of Different Anion Types
Version 2 2018-10-19, 20:29
Version 1 2018-10-16, 13:43
Posted on 2018-10-19 - 20:29
Thermal decomposition
of layered zinc hydroxides (LZHs) is a simple and convenient way to
achieve porous ZnO nanostructures. The type of anion contained in
an LZH determines the fundamental characteristics of the LZH and thus
affects the formation process of the resulting porous ZnO. Here we
report a comparative study on the crystal orientation relationship
between LZH precursors and the corresponding porous ZnO products by
using well-faceted and highly oriented LZH crystals with three different
anions, i.e., NO3–, SO42–, and Cl–. Highly oriented LZH crystals
were prepared on layer-by-layer coated indium tin oxide substrates
by electrodeposition in aqueous solution and were transformed into
porous ZnO by calcination in air. The synthesized materials were characterized
by X-ray diffraction, scanning electron microscopy with electron backscatter
diffraction, Fourier transformed infrared spectroscopy, and X-ray
photoelectron spectroscopy. The layered structure of the highly oriented
LZHs was parallel to the substrate surface and all transformed to
nanoporous ZnO with a ⟨0001⟩ preferred orientation.
The ⟨0001⟩ orientation degree and in-plane orientation
of the nanoporous ZnO differed significantly depending on the type
of anion but not the decomposition temperature, revealing that the
initial formation process of ZnO from the LZHs is crucial. Finally,
a possible transformation mechanism explaining the difference in the
resulting ZnO orientation by anions (NO3–, SO42–, and Cl–)
is discussed on the basis of their layered structure and thermal decomposition
processes.
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Shinagawa, Tsutomu; Watanabe, Mitsuru; Mori, Tetsuya; Tani, Jun-ichi; Chigane, Masaya; Izaki, Masanobu (2018). Oriented Transformation from Layered Zinc Hydroxides
to Nanoporous ZnO: A Comparative Study of Different Anion Types. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.8b01242
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AUTHORS (6)
TS
Tsutomu Shinagawa
MW
Mitsuru Watanabe
TM
Tetsuya Mori
JT
Jun-ichi Tani
MC
Masaya Chigane
MI
Masanobu Izaki