کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1232706 | 1495230 | 2015 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis, luminescence properties and EPR investigation of hydrothermally derived uniform ZnO hexagonal rods Synthesis, luminescence properties and EPR investigation of hydrothermally derived uniform ZnO hexagonal rods](/preview/png/1232706.png)
• Synthesized 1D hexagonal ZnO rods without the aid of any organic capping agents.
• Reaction temperature plays a crucial role in the formation of 1D hexagonal ZnO.
• Possible reasons for the observed morphological characteristics are discussed.
• Influence of reaction temperature on ZnO luminescence properties are explored.
One-dimensional (1D) zinc oxide (ZnO) hexagonal rods have been successfully synthesized by surfactant free hydrothermal process at different temperatures. It can be found that the reaction temperature play a crucial role in the formation of ZnO uniform hexagonal rods. The possible formation processes of 1-D ZnO hexagonal rods were investigated. The zinc hydroxide acts as the morphology-formative intermediate for the formation of ZnO nanorods. Upon excitation at 325 nm, the sample prepared at 180 °C show several emission bands at 400 nm (∼3.10 eV), 420 nm (∼2.95 eV), 482 nm (∼2.57 eV) and 524 nm (∼2.36 eV) corresponding to different kind of defects. TL studies were carried out by pre-irradiating samples with γ-rays ranging from 1 to 7 kGy at room temperature. A well resolved glow peak at ∼354 °C was recorded which can be ascribed to deep traps. Furthermore, the defects associated with surface states in ZnO nano-structures are characterized by electron paramagnetic resonance.
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Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 139, 15 March 2015, Pages 262–270