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. 2023 Jun 23;9(25):eadh3350. doi: 10.1126/sciadv.adh3350

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Fig. 6. — (A) Schematics showing the concept of an intelligent artificial plant. (B) Photo-driven movements of the stem. The stem uses a Janus structure composed of two different parts. The lower part (length, 15 mm) is made of the HAFMS-TSA with θ = 85° to enable photophobic movements, and the upper part (length, 40 mm) consists of HAFMS-TSA with θ = 40° to produce phototropic movements and large photonastic twisting. (C) Phototropic movements of the branch. (D) Proof-of-concept demonstration of the intelligent artificial plant. With varied light-driven orientation movements for different organs, the plant can adaptatively change its 3D hierarchical structures according to light irradiation conditions (e.g., illuminating direction and light intensity). (E and F) Photographs showing phototropic movements and photophobic movements enable the tunable and controllable 3D spatial reorientation of a HAFMS-TSA. (G and H) Light intensity–regulated directional bending can be used to tune the reorientation directions. The diagrams (G) and (H) show the bending angles of a HAFMS-TSA (θ = 40°; length, 40 mm; inner diameter, 2 mm) and a HAFMS-TSA (θ = 83°; length, 20 mm; inner diameter, 1 mm) upon different light intensities, respectively. The red arrows indicate the illuminating direction of the light. (I and J) One hundred cycles of phototropic bending of the HAFMS-TSA (θ = 0°) and photophobic bending of the HAFMS-TSA (θ = 83°) without obvious fatigue.