Engineering light-driven micromotors with fluorescent dye coatings for easy detection and tracking

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Micromotors are essential intelligent systems for tasks in biomedicine and environmental monitoring.
• A key challenge is the real-time detection and differentiation of individual micromotors in complex settings.

Purpose of the Study:

• To develop a scalable method for creating light-activated, dye-tagged micromotors.
• To enable independent detection, differentiation, and tracking of micromotors in complex media.

Main Methods:

• Fabrication of titanium dioxide/copper oxide-silica Janus spheres using glancing angle deposition (GLAD).
• Modification of micromotors with various fluorescent dyes (e.g., Alq3, Alizarin, zinc phthalocyanine).
• Utilizing light to control micromotor propulsion and fluorescence properties.

Main Results:

• Successfully synthesized dye-tagged micromotors propelled by low-intensity light.
• Demonstrated independent detection and differentiation of micromotors using fluorescence.
• Showcased the ability to identify swimming direction and distinguish micromotors from bacteria and other particles.

Conclusions:

• The facile GLAD technique allows for large-scale production of versatile dye-tagged micromotors.
• Fluorescent tagging enhances micromotor visibility and differentiation in complex microenvironments.
• These micromotors are promising for microfluidic and lab-on-a-chip applications, including biological and fluorescent sample analysis.