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Multi-Wavelength Light-Responsive Metal-Phenolic Network-Based Microrobots for Reactive Species Scavenging.

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New metal-phenolic network (MPN) microrobots offer fuel-free, multi-wavelength propulsion using near-infrared (NIR) and ultraviolet (UV) light. These tunable, asymmetric microrobots show enhanced reactive oxygen and nitrogen species (RONS) scavenging for potential medical applications.

Keywords:
antioxidationlight-drivenmicrorobotsmulti-wavelengths

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Robotics

Background:

  • Light-driven microrobots are crucial for various applications but often rely on precious metals and limited wavelengths.
  • Current microrobot systems face challenges with complex synthesis and restricted working wavelengths, hindering broader applicability.

Purpose of the Study:

  • To develop novel microrobots driven by multiple light wavelengths (near-infrared and ultraviolet) with a simplified synthesis process.
  • To create fuel-free, asymmetric microrobots with tunable structures and controlled mobility for advanced applications.

Main Methods:

  • Synthesis of hollow metal-phenolic network (MPN) microrobots using a sacrificial polystyrene bead template.
  • Incorporation of asymmetric capping layers to regulate microrobot symmetry and light responsiveness.
  • Demonstration of multi-wavelength (NIR and UV) light-driven propulsion and remote manipulation.

Main Results:

  • The synthesized MPN microrobots exhibited fuel-free mobility under both NIR and UV irradiation.
  • Microrobot velocity was controllable by adjusting the thickness of the asymmetric capping.
  • Remote manipulation of microrobot motion was achieved by switching light sources on and off.
  • Significant enhancement in reactive oxygen and nitrogen species (RONS) scavenging activity was observed.

Conclusions:

  • A novel synthesis strategy for asymmetric, light-navigated microrobots based on MPNs was established.
  • The developed microrobots possess tunable structures, multi-wavelength light-responsive mobility, and potent RONS scavenging capabilities.
  • This work paves the way for future medical treatments utilizing advanced microrobot systems.