Khan Muhammad Arif, Nayan Nafarizal, Ahmad Mohd Khairul, Fhong Soon Chin, Tahir Muhammad, Mohamed Ali Riyaz Ahmad, Mohamed Ali Mohamed Sultan
Microelectronics and Nanotechnology-Shamsuddin Research Centre (MiNT-SRC), Institute for Integrated Engineering, Universiti Tun Hussein Onn Malaysia (UTHM), Parit Raja, Batu Pahat Johor 86400, Malaysia.
Department of Physics, Faculty of Basic and Applied Sciences, International Islamic University, Sector H-10, Islamabad 44000, Pakistan.
Molecules. 2021 May 4;26(9):2700. doi: 10.3390/molecules26092700.
In this work, advanced nanoscale surface characterization of CuO Nanoflowers synthesized by controlled hydrothermal approach for significant enhancement of catalytic properties has been investigated. The CuO nanoflower samples were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), selected-area electron diffraction (SAED), high-angular annular dark field scanning transmission electron microscopy (HAADF-STEM) with elemental mapping, energy dispersive spectroscopy (STEM-EDS) and UV-Vis spectroscopy techniques. The nanoscale analysis of the surface study of monodispersed individual CuO nanoflower confirmed the fine crystalline shaped morphology composed of ultrathin leaves, monoclinic structure and purified phase. The result of HR-TEM shows that the length of one ultrathin leaf of copper oxide nanoflower is about ~650-700 nm, base is about ~300.77 ± 30 nm and the average thickness of the tip of individual ultrathin leaf of copper oxide nanoflower is about ~10 ± 2 nm. Enhanced absorption of visible light ~850 nm and larger value of band gap energy (1.68 eV) have further supported that the as-grown material (CuO nanoflowers) is an active and well-designed surface morphology at the nanoscale level. Furthermore, significant enhancement of catalytic properties of copper oxide nanoflowers in the presence of H2O2 for the degradation of methylene blue (MB) with efficiency ~96.7% after 170 min was obtained. The results showed that the superb catalytic performance of well-fabricated CuO nanoflowers can open a new way for substantial applications of dye removal from wastewater and environment fields.
在这项工作中，研究了通过可控水热法合成的氧化铜纳米花的先进纳米级表面表征，以显著提高其催化性能。通过场发射扫描电子显微镜（FE-SEM）、X射线粉末衍射（XRD）、X射线光电子能谱（XPS）、拉曼光谱、高分辨率透射电子显微镜（HR-TEM）、选区电子衍射（SAED）、带元素映射的高角度环形暗场扫描透射电子显微镜（HAADF-STEM）、能量色散光谱（STEM-EDS）和紫外-可见光谱技术对氧化铜纳米花样品进行了表征。对单分散的单个氧化铜纳米花的表面研究进行的纳米级分析证实了其由超薄叶片组成的精细晶体形状形态、单斜结构和纯净相。高分辨率透射电子显微镜的结果表明，氧化铜纳米花的一片超薄叶片的长度约为650-700nm，基部约为300.77±30nm，氧化铜纳米花单个超薄叶片尖端的平均厚度约为10±2nm。在850nm处可见光吸收增强以及较大的带隙能量值（1.68eV）进一步支持了生长的材料（氧化铜纳米花）在纳米级水平上是一种活性且设计良好的表面形态。此外，在过氧化氢存在下，氧化铜纳米花对亚甲基蓝（MB）的降解催化性能显著增强，170分钟后效率达到~96.7%。结果表明，精心制备的氧化铜纳米花的卓越催化性能可为废水和环境领域染料去除的大量应用开辟一条新途径。
