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Motion-Based pH Sensing Based on the Cartridge-Case-like Micromotor.

Yajun Su1, Ya Ge1, Limei Liu1

  • 1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices and Collaborative Innovation Center (CIC) of Suzhou Nano Science and Technology, Soochow University , Suzhou, Jiangsu 215123, People's Republic of China.

ACS Applied Materials & Interfaces
|January 28, 2016
PubMed
Summary

This study introduces a novel pH-responsive micromotor. Its movement speed correlates with pH, enabling its use as a motion-based pH sensor.

Keywords:
autonomous movementhydrogen peroxidemicromotormotion-based sensingself-propelling

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Chemical Engineering

Background:

  • Micromotors offer potential for advanced applications in sensing and drug delivery.
  • Designing micromotors with tunable responses to environmental stimuli is crucial for their practical utility.
  • Existing micromotors often lack sophisticated mechanisms for controlled movement and sensing.

Purpose of the Study:

  • To develop a novel cartridge-case-like micromotor with pH-responsive behavior.
  • To investigate the autonomous movement of the micromotor in a hydrogen peroxide fuel solution.
  • To explore the application of this micromotor as a motion-based pH sensor.

Main Methods:

  • Fabrication of the micromotor using template synthesis, creating a gelatin shell with inner platinum nanoparticles.
  • Observation of pH-dependent "open and close" behavior due to gelatin's responsiveness.
  • Utilizing the catalytic activity of platinum nanoparticles for autonomous propulsion in hydrogen peroxide.

Main Results:

  • The micromotor demonstrated autonomous movement in aqueous solutions.
  • A direct correlation was observed between the micromotor's velocity and the solution's pH.
  • The micromotor's speed increased monotonically with increasing pH across the entire pH range.

Conclusions:

  • The developed micromotor functions effectively as a motion-based pH sensor.
  • Material properties, specifically gelatin's pH responsiveness and platinum nanoparticle catalysis, dictate motion behavior.
  • This work opens avenues for motion-based sensing applications utilizing responsive micromotor designs.