Visible light driven TiO₂/Pt micromotor with directional motion.

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Light-driven micromotors offer promise for biomedical and environmental uses.
• Conventional UV or IR light systems have limitations like biotoxicity and thermal damage.

Purpose of the Study:

• To develop a novel micromotor for efficient propulsion using visible light.
• To overcome limitations of existing light-driven micromotor technologies.

Main Methods:

• Fabrication of TiO2/Pt Janus micromotors.
• Utilizing synergistic bandgap engineering and asymmetric catalysis.
• Employing platinum-mediated Schottky junctions for visible light absorption.

Main Results:

• Achieved efficient, surfactant-free propulsion in pure water under visible light (455 nm) at low intensity (30 mW cm⁻²).
• Demonstrated precise motion control via light intensity, start-stop switching, and co-catalyst acceleration.
• Exhibited enhanced directional persistence and multi-cycle stability compared to UV-driven systems.

Conclusions:

• The developed micromotors provide a biocompatible, fuel-free microactuation platform with minimal thermal effects.
• This technology advances visible-light-controlled micromotors for practical applications like drug delivery and environmental remediation.