Hybrid microrobots have recently attracted attention due to their ability to combine different energy sources and/or external stimuli for propulsion and performing desired tasks. Despite progresses in the past, on-demand speed modulation for hybrid microrobots has not been analyzed in detail. Herein, the influence of surface properties and crystallite size on the propulsion mechanism of Pt/TiO2 chemical/light-driven hybrid microrobots is investigated. The morphology of urchin-like Pt/TiO2 microrobots leads to “on-the-fly” optical brake behavior under UV irradiation. In contrast, smooth Pt/TiO2 microrobots demonstrate accelerated motion in the same conditions. The comparison between two types of microrobots also indicates the significance of a high surface area and a high crystallite size to increase their speed. The results demonstrate the profound impact of surface features for next-generation smart micro/nanorobots with on-demand reaction capability in dynamically changing environments.
Bibliographical noteFunding Information:
M.P. was supported by Ministry of Education, Youth and Sports (Czech Republic) grant LL2002 under ERC CZ program. CzechNanoLab project LM2018110 funded by MEYS CR is gratefully acknowledged for the financial support of the measurements/sample fabrication at CEITEC Nano Research Infrastructure. C.M.O. acknowledges the grants CEITEC‐K‐21‐7049, which was financed from Quality Internal Grants of BUT Reg. No CZ.02.2.69/0.0/0.0/19_073/0016948, and CEITEC VUT‐J‐21‐7524. D.K.Y. acknowledges the grant 118M195, which was supported from The Scientific and Technological Research Council of Turkey. The authors would like to thank Dr. M. Urso for his help with Tafel measurements and Dr. J. V. Vaghasiya for his help with BET analysis.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)