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Structure-Property Modulation in Pyrolytic Photoresist Films Enabled Size-Dependent Electrochemical Performance of

Junke Wang1, Huidi Liu1, Wenwei Wu1

  • 1Institute of Microelectronics and Integrated Circuits, School of Microelectronics, Hubei University, Wuhan 430062, China.

ACS Applied Materials & Interfaces
|December 17, 2025
PubMed
Summary

Researchers developed a new biocompatible carbon material for neural probes. This pyrolytic photoresist film (PPF) offers superior electrochemical performance for improved brain activity monitoring.

Keywords:
brain-computer interfacecarbon materialsmicroelectrode arraymicronano fabricationmultichannel flexible neural probespyrolytic photoresist films

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Area of Science:

  • Biomaterials Science
  • Neurotechnology
  • Materials Engineering

Background:

  • Traditional neural probes using metal electrodes face challenges like poor biocompatibility and electromagnetic interference.
  • Developing advanced materials is crucial for effective neural recording and brain-computer interfaces.

Purpose of the Study:

  • To investigate pyrolytic photoresist film (PPF) as a biocompatible material for neural probes.
  • To optimize PPF properties through controlled pyrolysis and establish a model for performance enhancement.
  • To fabricate and evaluate multichannel flexible neural probes using PPF.

Main Methods:

  • Systematic study of pyrolysis temperature and hold time effects on PPF material properties.
  • Development of a quantitative model linking electrode geometric area to electrochemical performance.
  • Fabrication and electrochemical characterization of multichannel flexible neural probes.

Main Results:

  • Identified optimal pyrolysis conditions at 1000 °C for 2 hours for PPF.
  • Established a quantitative model for optimizing PPF neural probe performance.
  • Successfully fabricated flexible neural probes with enhanced electrochemical properties.

Conclusions:

  • Pyrolytic photoresist film (PPF) is a promising biocompatible material for neural probes.
  • Optimized pyrolysis and geometric design significantly improve neural probe electrochemical performance.
  • The developed PPF neural probes offer a superior alternative for brain activity monitoring.