Abstract
We report on the evolution of the characteristics of CoAl-based layered double hydroxide (LDH) nanostructures on a rigid substrate using various source concentrations in a solution-based growth method. As the source concentration in the solution increases, the morphologies of the CoAl-LDHs become denser and more closely packed, while the thickness of each LDH plate is maintained. Structural and chemical investigations revealed that mixed phases of CoO and CoAl-LDH formed at lower source concentrations, while Co2+Al3+- and Co2+Co3+-LDHs formed as the concentration increased. The optical band gap energy and abnormal electronic transition in the CoAl-based LDH were determined for the first time. The band gap energy decreased when increasing the Co3+ ion content in the LDHs in the range of 2.64–3.06 eV. Based on structural and chemical investigations, a morphological evolution mechanism is suggested for the formation of Co2+Al3+- and Co2+Co3+-LDH with variation of the solution concentration.
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