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New DC conductivity spectra of Zn–Al layered double hydroxide (Zn–Al–NO3–LDH) and its calcined product of ZnO phase

1 Department of Physics, Faculty of Applied Science, Thamar University, Dhamar 87246, Yemen
2 Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
3 Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

Topical Section: Optical/Electronic/Magnetic properties

Zn–Al–NO3–LDH nanostructure was synthesized via the coprecipitation method at molar ratio Zn2+/Al3+ = 4 and pH = 7. The resultant sample was thermally treated at calcined temperatures of 50, 100, 150, 200, 250 and 300 °C. The layered structure of the Zn–Al–NO3–LDH samples was stable below the calcination temperature 200 °C as shown in powder X-ray diffraction (PXRD) patterns of calcined samples. The calcination products showed a collapse of LDH structure and ZnO phase was formed at 200 °C and above. The dielectric spectroscopy of LDH was explained using anomalous low frequency dispersion (ALFD) due to the low mobility of LDH carriers. The conductivity spectra of LDH can be theoretically described according to the effective phase within the calcination products of LDH. In the comparison with previously researches, this study presented higher values of DC conductivity for all studied samples.
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Keywords layered double hydroxide nanostructure; ZnO; co-precipitation method; heat treatment; DC conductivity; anomalous low frequency dispersion

Citation: Abdullah Ahmed Ali Ahmed, Zainal Abidin Talib, Mohd Zobir Hussein, Yusra Abdullah Ahmed Al-Magdashi. New DC conductivity spectra of Zn–Al layered double hydroxide (Zn–Al–NO3–LDH) and its calcined product of ZnO phase. AIMS Materials Science, 2017, 4(3): 670-679. doi: 10.3934/matersci.2017.3.670


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