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Issue 13, 2016
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Light-controlled bubble propulsion of amorphous TiO2/Au Janus micromotors

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Abstract

In this work, a bubble-propelled photoactivated amorphous TiO2/Au (Am-TiO2/Au) Janus micromotor has been demonstrated by utilizing the efficient photocatalytic H2O2 decomposition over the in situ H2O2 sensitized Am-TiO2 under UV irradiation. The power conversion of the micromotor experiences a process from UV light power, to chemical power and finally to mechanical power. The quantum efficiency of O2 bubble evolution from photocatalytic decomposition of H2O2 reaches 28%, and the power conversion efficiency reaches 1.28 × 10−9, which enables the micromotor to generate a strong bubble thrust propelling itself forward with a maximum speed of 135 μm s−1. The motion state and speed of the Am-TiO2/Au micromotors can be reversibly, wirelessly and remotely controlled at will with an ultrafast response rate (less than 0.1 s) by regulating “on/off” switch and intensity of UV irradiation. Consequently, the as-developed Am-TiO2/Au micromotors may promise potential challenging applications in such as “on-the-fly” adsorption and decomposition of pollutants in water.

Graphical abstract: Light-controlled bubble propulsion of amorphous TiO2/Au Janus micromotors

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Publication details

The article was received on 15 Dec 2015, accepted on 09 Jan 2016 and first published on 15 Jan 2016


Article type: Paper
DOI: 10.1039/C5RA26798F
Citation: RSC Adv., 2016,6, 10697-10703
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    Light-controlled bubble propulsion of amorphous TiO2/Au Janus micromotors

    Y. Li, F. Mou, C. Chen, M. You, Y. Yin, L. Xu and J. Guan, RSC Adv., 2016, 6, 10697
    DOI: 10.1039/C5RA26798F

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