Li, Jie Cho, Yigil Choi, In-Suk Yang, Shu 2024-01-20T10:03:27Z 2024-01-20T10:03:27Z 2021-09-04 2014-04 1616-301X https://pubs.kist.re.kr/handle/201004/126966 Two-dimensional nanowaves with long-range order are fabricated by exploiting swelling-induced buckling of one-dimensional (1D) nanowalls with nanofibers formed in-between during holographic lithography of the negative-tone photoresist SU-8. The 1D film goes through a constrained swelling in the development stage, and becomes buckled above the critical threshold. The degree of lateral undulation can be controlled by tuning the pattern aspect ratio (height/width) and exposure dosage. At a high aspect ratio (e.g., 6) and a high exposure dosage, nanofibers (30-50 nm in diameter) are formed between the nanowalls as a result of overlapping of low crosslinking density regions. By comparing experimental results with finite-element analysis, the buckling mechanism is investigated, which confirms that the nanofibers prevent the deformed nanowalls from recovery to their original state, thus, leading to long-range ordered two-dimensional (2D) wavy structures. The film with nanowaves show weaker reflecting color under an ambient light and lower transmittance compared to the straight nanowalls. Using double exposure through a photomask, patterns consisting of both nanowaves and nanowalls for optical display are created. English WILEY-V C H VERLAG GMBH PHOTONIC STRUCTURES MICROPILLAR ARRAYS CAPILLARY FORCES FABRICATION CRYSTALS Transforming One-Dimensional Nanowalls to Long- Range Ordered Two- Dimensional Nanowaves: Exploiting Buckling Instability and Nanofi bers Effect in Holographic Lithography Article 10.1002/adfm.201302826 1 ADVANCED FUNCTIONAL MATERIALS, v.24, no.16, pp.2361 - 2366 ADVANCED FUNCTIONAL MATERIALS 24 16 2361 2366 scie scopus 000334500600013 2-s2.0-84898786968 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article PHOTONIC STRUCTURES MICROPILLAR ARRAYS CAPILLARY FORCES FABRICATION CRYSTALS holographic lithography buckling nanowaves long-range order nanofibers