Nickel aluminate oxides/hydroxides by pulsed laser ablation of NiAl2O4 powder in water |
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| Authors: | Ya-Ting Chan Chao-Hsien Wu Pouyan Shen Shuei-Yuan Chen |
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| Institution: | 1. Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, ROC
2. Department of Mechanical and Automation Engineering, I-Shou University, Kaohsiung, 84001, Taiwan, ROC
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| Abstract: | Submicron-sized NiAl2+X O4 fragments and nanocondensates of Ni-doped γ-Al2O3, Al-doped NiO and β-Ni(OH)2 were synthesized simultaneously by pulsed laser ablation of NiAl2O4 powder in water and characterized using X-ray/electron diffraction and optical spectroscopy. The NiAl2+X O4 is Al-enriched spinel with dislocations and subgrains. The Ni-doped γ-Al2O3 spinel has paracrystalline distribution (i.e., with fair constant longitudinal spacing, but variable relative lateral translations) of defect clusters and intimate intergrowth of θ-Al2O3 and 2x( \( \overline{1} \) 3 \( \overline{1} \) ) commensurate superstructure. The Al-doped NiO has perfect cubo-octahedron shape and as small as 5 nm in size. The β-Ni(OH)2 and 1-D turbostratic hydroxide lamellae occurred as a matrix of these oxide nanoparticles. The colloidal suspension containing the composite phases has a minimum band gap of 5.3 eV for potential photocatalytic applications. |
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