Thermal, structural, textural and optical properties of ZnO/ZnAl2O4 mixed metal oxide-based Zn/Al layered double hydroxide
Mixed metal oxides (MMO) with a homogenously distributed ZnAl 2 O 4 in ZnO network were prepared through a novel combination of co-precipitation and thermal treatment approaches using Zn/Al-layered double hydroxide (LDH) as precursor. The effect of thermal treatment temperature of Zn/Al-LDH for the...
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Main Authors: | , , , , , , , |
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Format: | Article |
Published: |
IOP Publishing
2018
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Subjects: | |
Online Access: | http://eprints.um.edu.my/20803/ https://doi.org/10.1088/2053-1591/aadbca |
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Summary: | Mixed metal oxides (MMO) with a homogenously distributed ZnAl 2 O 4 in ZnO network were prepared through a novel combination of co-precipitation and thermal treatment approaches using Zn/Al-layered double hydroxide (LDH) as precursor. The effect of thermal treatment temperature of Zn/Al-LDH for the formation of ZnO/ZnAl 2 O 4 -MMO was studied via their thermal, structural, textural and optical properties. The results reveal that the synthesized Zn/Al-LDH was advanced to ZnO/ZnAl 2 O 4 -MMO starting at 200 °C, while heat treatment at 400 °C resulted in the optimum BET surface area of 53 m 2 g -1 with formation of mesoporous structure. Furthermore, diffuse reflectance microscopy showed that there is more than one energy band gap of pristine Zn/Al-LDH, while samples treated at 200 °C and above demonstrated a single energy band gap with redshift from 3.3 to 3.21 eV. Photoluminescence (PL) analysis showed a quench in the PL spectra as the temperature increased to 400 °C, where the sample with the optimum surface area presents the highest I NBE /I DLE ratio of 0.78. A precise control of the thermal treatment temperature provides short pathways for preparing high BET surface area MMO-based materials. |
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