Abstract
• High efficiency photo driven reversible adhesion smart surface inspired by gecko. • The smart surface could increase up to 88.5 °C in 60 s trigger by MoO 3 dots. • The mechanism of the reversible process were discussed. Inspired by the detachment behavior of gecko toe valgus, a reversible dry adhesive surface was developed, which is composed of polydimethylsiloxane (PDMS) micropillar arrays and MoO 3-x quantum dots (MoO 3-x QDs). The reversibility of adhesion is caused by the thermal expansion of the overall structure of the PDMS micropillar array due to the thermal response of MoO 3-x QDs to external stimuli. Under infrared laser irradiation, the interface temperature of MoO 3-x -PDMS surface increased from 20 °C to 88.5 °C in 60 s. The MoO 3-x QDs-induced photothermal conversion facilitate the reduction of the real contact fraction between the bio-inspired micropillar arrays and the opposing/target surface, resulting in a significant decrease in adhesion. This work demonstrates a new strategy for realizing remote control of smart adhesives or surfaces. The mechanism elucidated in this work may find a broad application, such as in climbing robots, micro-manipulation/micro-selection in advanced manufacturing, active self-cleaning surface for solar panels, fibrillar dry adhesives and touch sensitive grippers in outer space explorations, and more.
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