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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Deep-level temperature sensing in animal tissues is challenging and rarely reported.
  • Existing methods lack the necessary multifunctionality for comprehensive biological monitoring.

Purpose of the Study:

  • To present a novel method for fabricating multifunctional micro-probes for deep-level temperature and electrical signal detection.
  • To evaluate the mechanical and electrochemical properties of these micro-probes for in vivo applications.

Main Methods:

  • Fabrication of micro-probes using standard cleanroom procedures on stainless-steel foil.
  • Integration of palladium-chromium (Pd-Cr) thin-film thermocouples for thermal sensing.
  • Incorporation of palladium (Pd) electrode openings for electrical signal detection.
  • Testing of sword-shaped freestanding micro-probes (up to 30 mm) in live rat brain and muscle tissues.

Main Results:

  • Successful fabrication of multifunctional micro-probes with reliable thermal sensing arrays.
  • Demonstrated excellent mechanical strength and elastic properties for insertion into biological tissues.
  • Confirmed suitable electrochemical properties for potential biological applications.
  • Micro-probes showed promising performance in detecting local temperatures within live rat tissues.

Conclusions:

  • The developed micro-probes are a promising tool for deep-level temperature and electrical signal monitoring in biological tissues.
  • The fabrication method using standard cleanroom procedures offers a viable route for creating advanced biosensors.
  • These multifunctional micro-probes have significant potential for future biological and medical research applications.