Dipole-Moment Induced Phototaxis and Fuel-Free Propulsion of ZnO/Pt Janus Micromotors

He，Xiaoli1; Jiang，Huaide1; Li，Jianjie1; Ma，Yanmei1; Fu，Bi1; Hu，Chengzhi1,2

2021

10.1002/smll.202101388

Small   影响因子和分区

1613-6810

1613-6829

Light-driven micromotors have stimulated considerate interests due to their potentials in biomedicine, environmental remediation, or serving as the model system for non-equilibrium physics of active matter. Simultaneous control over the motion direction and speed of micro/nanomotors is crucial for their functionality but still difficult since Brownian motion always randomizes the orientations. Here, a highly efficient light-driven ZnO/Pt Janus micromotor capable of aligning itself to illumination direction and exhibiting negative phototaxis at high speeds (up to 32 µm s) without the addition of any chemical fuels is developed. A light-triggered self-built electric field parallel to the light illumination exists due to asymmetrical surface chemical reactions induced by the limited penetration depth of light along the illumination. The phototactic motion of the motor is achieved through electrophoretic rotation induced by the asymmetrical distribution of zeta potential on the two hemispheres of the Janus micromotor, into alignment with the electric field. Notably, similar phototactic propulsion is also achieved on TiO/Pt and CdS/Pt micromotors, which presents explicit proof of extending the mechanism of dipole-moment induced phototactic propulsion in other light-driven Janus micromotors. Finally, active transportation of yeast cells are achieved by the motor, proving its capability in performing complex tasks.

fuel-free propulsion Phototaxis self-alignment zeta potential dipole ZnO/Pt

SCI ; EI

英语

第一 ; 通讯

WOS:000667366000001

20212610573003

Cadmium sulfide ; Dipole moment ; Electric fields ; II-VI semiconductors ; Oxide minerals ; Propulsion ; Surface reactions ; Titanium dioxide ; Zinc oxide

Minerals:482.2 ; Electricity: Basic Concepts and Phenomena:701.1 ; Electric Motors:705.3 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2

2-s2.0-85108785701

Scopus

1.Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities,Southern University of Science and Technology,Shenzhen,518055,China

He，Xiaoli,Jiang，Huaide,Li，Jianjie,et al. Dipole-Moment Induced Phototaxis and Fuel-Free Propulsion of ZnO/Pt Janus Micromotors[J]. Small,2021,17.

He，Xiaoli,Jiang，Huaide,Li，Jianjie,Ma，Yanmei,Fu，Bi,&Hu，Chengzhi.(2021).Dipole-Moment Induced Phototaxis and Fuel-Free Propulsion of ZnO/Pt Janus Micromotors.Small,17.

He，Xiaoli,et al."Dipole-Moment Induced Phototaxis and Fuel-Free Propulsion of ZnO/Pt Janus Micromotors".Small 17(2021).