Kim Kyungmin, Hong Minpyo, Song Yongnam
School of Mechanical Engineering, Korea University, Seoul, Republic of Korea.
Nanotechnology. 2024 Jun 7;35(34). doi: 10.1088/1361-6528/ad50e1.
This study investigated the hydrophobic-hydrophilic characteristics of zinc oxide (ZnO) nanorod coatings for potential biomedical applications. We examined the effects of different alignments of ZnO nanorods on the wetting and mechanical characteristics of the coatings. ZnO seed layers were prepared on stainless-steel plates using atomic layer deposition (ALD) at five different temperatures ranging from 50 to 250 °C. The ZnO nanorod coatings were then deposited on these seed layers through chemical bath deposition. The polycrystalline structure of the seed layers and the morphology of the nanorods were analyzed using grazing incidence angle x-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Mechanical and wetting properties of the nanorod coatings were examined using nanoindentation and water-droplet tests. The seed layers produced at 50 and 250 °C showed stronger (0 0 2) peaks than the other layers. ZnO nanorods on these seed layers exhibited greater vertical orientation and lower water contact angles indicating a more hydrophilic surface. Additionally, vertically oriented nanorod coatings demonstrated greater elastic modulus and hardness than those of oblique nanorods. Our findings indicate that ALD technology can be used to control the spatial arrangement of ZnO nanorods and optimize the hydrophobic-hydrophilic and mechanical properties of coating surfaces.
本研究调查了用于潜在生物医学应用的氧化锌（ZnO）纳米棒涂层的疏水-亲水特性。我们研究了ZnO纳米棒不同排列方式对涂层润湿性和机械特性的影响。使用原子层沉积（ALD）在50至250°C的五个不同温度下在不锈钢板上制备ZnO籽晶层。然后通过化学浴沉积在这些籽晶层上沉积ZnO纳米棒涂层。使用掠入射角X射线衍射、透射电子显微镜和扫描电子显微镜分析籽晶层的多晶结构和纳米棒的形态。使用纳米压痕和水滴测试来检测纳米棒涂层的机械和润湿性能。在50°C和250°C下制备的籽晶层比其他层显示出更强的（0 0 2）峰。这些籽晶层上的ZnO纳米棒表现出更大的垂直取向和更低的水接触角，表明表面更亲水。此外，垂直取向的纳米棒涂层比倾斜纳米棒涂层表现出更大的弹性模量和硬度。我们的研究结果表明，ALD技术可用于控制ZnO纳米棒的空间排列，并优化涂层表面的疏水-亲水和机械性能。
