Growth and optical band gap of CdAl-layered double hydroxide thin structures on rigid substrate

We report the optical and chemical properties of a CdAl-layered double hydroxide (LDH) grown by a low-temperature hydrothermal method on rigid substrates. Structural and chemical investigations showed that the CdAl-LDH structures were formed as the source concentration was increased up to 45 mM. Mix...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-03, Vol.737, p.725-730
Main Authors: Cho, Deok-Ki, Jeon, Chan-Woo, Park, Il-Kyu
Format: Article
Language:English
Subjects:
Aluminum
Band gap
Band gap energy
CdAl-Layered double hydroxide
Chemical properties
Energy gap
Hydrothermal crystal growth
Hydrothermal growth
Hydroxides
Ions
Optical properties
Spectrum analysis
Substrates
Ultraviolet radiation
UV–Vis spectroscopy
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Summary:We report the optical and chemical properties of a CdAl-layered double hydroxide (LDH) grown by a low-temperature hydrothermal method on rigid substrates. Structural and chemical investigations showed that the CdAl-LDH structures were formed as the source concentration was increased up to 45 mM. Mixed phases of CdO, Cd(OH)2, and CdAl-LDH structures were formed when the source concentration was less than 30 mM. X-ray photoelectron spectroscopy indicated that the Cd and Al metal ions were present in the LDHs as divalent and trivalent ionic states, respectively. Optical investigations by UV–vis spectroscopy indicated that the CdAl-LDH had a direct band gap structure with an energy band gap of 3.01 eV. •CdAl-layered double hydroxides are grown on Si substrate by hydrothermal method.•Growth mechanism of the CdAl-layered double hydroxides is investigated.•Band gap energy of the CdAl-layered double hydroxide is found to be 3.01 eV.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.12.163