Synthesis and optical properties of nanocrystalline ZnO powders prepared by a direct thermal decomposition route |
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Authors: | Sarawuth Labuayai Vinich Promarak and Santi Maensiri |
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Institution: | (1) Small & Strong Materials Group (SSMG), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand;(2) Integrated Nanotechnology Research Center (INRC), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand;(3) Advanced Organic Materials and Devices Laboratory, Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Varinchamrap, Ubon Ratchathani, 34190, Thailand |
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Abstract: | This paper reports the synthesis and optical properties of nanocrystalline ZnO powders with crystallite sizes of 32.5 (±1.4)–43.4
(±0.4) nm prepared by a direct thermal decomposition of zinc acetate at the temperatures of 400, 500, 600, and 700°C for 4
h. The structure of the prepared samples was studied by XRD and FTIR spectroscopy, confirming the formation of wurtzite structure.
The morphology of the samples revealed by SEM was affected by the thermal decomposition temperature, causing the formations
of both nanoparticles and nanorods with different size and shape in the samples. The synthesized powders exhibited the UV
absorption below 400 nm (3.10 eV) with a well defined absorption peak at around 285 nm (4.35 eV). The estimated direct bandgaps
were obtained to be 3.19, 3.16, 3.14, and 3.13 eV for the ZnO samples thermally decomposed at 400, 500, 600, and 700°C, respectively.
All the samples exhibited room-temperature photoluminescence (PL) showing a strong UV emission band at ∼395 nm (3.14 eV),
a weak blue band at ∼420 nm (2.95 eV), a blue–green band at ∼485 nm (2.56 eV), and a very weak green band at ∼529 nm (2.35 eV).
The mechanisms responsible for photoluminescence of the samples are discussed. |
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Keywords: | PACS" target="_blank">PACS 61 46 Hk 68 37 Lp 78 30 Fs 78 40 Fy 78 67 Bf 78 55 Et 81 05 Dz 81 07 Bc 81 07 Wx 81 20 Ka 81 70 Pg |
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