Department of Nature-Inspired Nanoconvergence Systems , Korea Institute of Machinery and Materials , Daejeon 34103 , Republic of Korea.
ACS Appl Mater Interfaces. 2019 Oct 30;11(43):40835-40841. doi: 10.1021/acsami.9b14009. Epub 2019 Oct 15.
Surface-reinforced chitosan nanoparticles were used instead of polystyrene nanoparticles in the nanostructuring of antireflective, self-cleaning surfaces. Nanosphere lithography is a fascinating method to fabricate functional surfaces, but a large amount of nanoparticles are used and drained. Because synthetic polymer nanoparticles cause serious ecological and biological problems, the preparation of spherical nanoparticles was attempted with biodegradable, natural polymers, including chitosan and cellulose for application in nanosphere lithography. Chitosan nanospheres can be formed with a controlled size and surface charge, whereas cellulose spherical nanoparticles are hard to make. Therefore, chitosan nanoparticles were chosen and enclosed with trichloro(phenyl)silane to enhance their stability under plasma etching. A monolayer of the surface-reinforced chitosan nanoparticles was coated on a glass surface via a floating method for nanosphere lithography to act as a mask under reactive ion etching. After etching, the nanostructured glass showed a 2% increased transmittance compared with bare glass at 550 nm due to an antireflective effect. Moreover, the nanostructured glass with perfluoropolyether coating had a water contact angle of 152° and exhibited superhydrophobicity and a self-cleaning effect. This work addresses the issues of ecofriendly nanostructuring based on biodegradable, natural polymer nanoparticles for energy- and water-saving applications of nanostructured surfaces, by demonstrating the practical utilization of chitosan nanoparticles in nanosphere lithography.
采用表面增强壳聚糖纳米粒子替代聚苯乙烯纳米粒子，用于构建具有减反射和自清洁功能的纳米结构化表面。纳米球光刻技术是一种制造功能表面的迷人方法，但需要使用大量的纳米粒子，且这些纳米粒子会被浪费。由于合成聚合物纳米粒子会导致严重的生态和生物问题，因此尝试使用可生物降解的天然聚合物，包括壳聚糖和纤维素，来制备球形纳米粒子，以应用于纳米球光刻技术。壳聚糖纳米球可以通过控制尺寸和表面电荷来形成，而纤维素的球形纳米粒子则很难制备。因此，选择壳聚糖纳米粒子，并通过三氯（苯基）硅烷进行包裹，以增强其在等离子体刻蚀下的稳定性。通过浮法在玻璃表面涂覆一层表面增强的壳聚糖纳米粒子单层，用于反应离子刻蚀中的纳米球光刻，作为掩模。刻蚀后，与裸玻璃相比，在 550nm 处，具有纳米结构的玻璃的透光率增加了 2%，这是由于其具有减反射效果。此外，具有全氟聚醚涂层的纳米结构化玻璃的水接触角为 152°，表现出超疏水性和自清洁效果。这项工作解决了基于可生物降解的天然聚合物纳米粒子的环保型纳米结构化问题，展示了壳聚糖纳米粒子在纳米球光刻技术中的实际应用。
