Carbon nitride-based light-driven microswimmers with intrinsic photocharging ability

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Controlling autonomous microswimmers is crucial for targeted drug delivery and environmental remediation.
• Light-driven propulsion offers a promising avenue for micro/nanomachine applications.

Purpose of the Study:

• To develop efficient, light-driven microswimmers using 2D carbon nitride-based Janus particles.
• To elucidate the propulsion mechanism and explore novel functionalities like solar energy storage.

Main Methods:

• Fabrication of 2D carbon nitride-based Janus particles with various capping materials (Au, Pt, SiO2) and fuels (H2O2, alcohols).
• Photoelectrochemical analysis to study surface photoreactions and determine propulsion mechanisms.
• Investigation of the solar energy storage capability for sustained propulsion.

Main Results:

• Demonstrated efficient light-driven propulsion of Janus particles in aqueous media using visible and UV light.
• Identified diffusiophoresis as the dominant propulsion mechanism, with ORR as the major surface reaction.
• Introduced "solar battery swimming" where particles store solar energy for persistent, light-independent propulsion.

Conclusions:

• 2D carbon nitride-based Janus particles are highly efficient light-driven microswimmers.
• The developed "solar battery swimming" concept enables persistent propulsion, extending microswimmer capabilities.
• These findings have significant implications for targeted drug delivery, environmental remediation, and other micro/nanomachine applications.