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

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>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)<SUB>2</SUB>, 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.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CdAl-layered double hydroxides are grown on Si substrate by hydrothermal method. </LI> <LI> Growth mechanism of the CdAl-layered double hydroxides is investigated. </LI> <LI> Band gap energy of the CdAl-layered double hydroxide is found to be 3.01 eV. </LI> </UL> </P>