fig6

Figure 6. Single-hierarchical regularity structure. (A) Constructing conical microstructural ionic layer using Calathea Zebrine Leaf as a template. Reproduced with permission^[9]. Copyright 2018, Wiley-VCH; (B) 6 × 6 iontronic pressure sensing array with micropyramid structures. Reproduced with permission^[115]. Copyright 2023, Wiley-VCH; (C) High transparency pressure sensor with microdome. Reproduced with permission^[116]. Copyright 2022, Springer Nature; (D) The flexible iontronic pressure sensor with a cut-corner short micropillar array ionic layer. Reproduced with permission^[117]. Copyright 2024, American Chemical Society; (E) An ionic gel film with long micropillar array prepared using laser engraving templates. Reproduced with permission^[29]. Copyright 2022, American Chemical Society. [EMIM]: 1-ethyl-3-methylimidazolium; [TFSI]: bis(trifluoromethanesulfonyl)imide; ΔC: capacitance variation.