Advanced Materials and Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, 641 046, India.
Materials Science Division, Inter University Accelerator Centre, New Delhi, 110 067, India.
Sci Rep. 2017 Jun 12;7(1):3251. doi: 10.1038/s41598-017-03313-8.
Tailoring the surface properties by varying the chemistry and roughness could be of interest for self-cleaning applications. We demonstrate the transformation of hydrophobic ZnO Nano rod (NR) array into superhydrophobic nature by changing the local chemical state and without altering the surface roughness by swift heavy ion (SHI) irradiation. The aligned ZnO NR arrays were irradiated using 150 MeV Ag ions with different fluences from 5E10 to 3E12 ions/cm. The observed static water contact angles of ZnO NRs samples were 103° ± 3°, 152° ± 4°,161° ± 3°, 164° ± 2°, 167° ± 2°,154 ± 3° and 151° ± 2° for the pristine, ion fluencies of 1E11, 3E11, 5E11, 7E11, 1E12 and 3E12 ions cm, respectively. The change in local surface chemistry via formation of surface oxygen related defects due to electronic excitations induced by ion irradiation determine the water dewetting properties. It is found that surface oxygen related defects could be tuned by varying the fluence of the SHIs. Durability tests show that the SHI induced surface oxygen-deficient ZnO NRs have the stable superhydrophobic behavior for more than a year.
通过改变化学性质和粗糙度来调整表面性能可能对自清洁应用感兴趣。我们通过改变局部化学状态，在不改变表面粗糙度的情况下，通过 swift 重离子（SHI）辐照将疏水 ZnO 纳米棒（NR）阵列转变为超疏水性质。使用 150 MeV Ag 离子对排列整齐的 ZnO NR 阵列进行辐照，辐照剂量分别为 5E10 至 3E12 离子/cm。观察到 ZnO NRs 样品的静态水接触角分别为 103°±3°、152°±4°、161°±3°、164°±2°、167°±2°、154°±3°和 151°±2°，对应的原始、离子剂量分别为 1E11、3E11、5E11、7E11、1E12 和 3E12 离子/cm。由于离子辐照引起的电子激发形成表面氧相关缺陷，导致局部表面化学发生变化，从而决定了水的去湿性能。结果表明，通过改变 SHI 的剂量可以调整表面氧相关缺陷。耐久性测试表明，SHI 诱导的表面缺氧 ZnO NRs 具有超过一年的稳定超疏水性行为。
