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. 2021 Mar 11;121(8):4561–4677. doi: 10.1021/acs.chemrev.0c00752

Table 2. Preparation Methods of Gradient Surfaces with Anisotropic Topographies.

gradient patterns preparation methods topographical size ref
grating EBL and UV-assisted capillary force lithography constant ridge width (1 μm) and depth (400 nm) and variable groove widths (1–9.1 μm) (160)
combination of nanoimprint lithography and photopolymerization gradient in pattern height (0–350 nm) (174)
pillar EBL and plasma etching pillar height changes from planar to 250 nm over 9 mm (161)
photolithography and soft-lithography pillar diameter 2 μm, pitch size 5.5 μm and variable heights between 3.8 and 10.1 μm (168)
wrinkle unidirectional strain during surface oxidation using shielded plasma oxidation by applying a mask W: 464–7121 nm (100)
A: 49–2561 nm
W: 200–1087 nm (34)
A: 0.1 nm–260 nm
W: 0.8–14 μm (172)
A: 144–3000 nm
W: 4–30 μm (173)
A: 144–3000 nm
W: 464–10990 nm (171)
A: 49–3425 nm
W: 1520–9934 nm (170)
A: 176–2168 nm