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Multimodal Electrocorticogram Active Electrode Array Based on Zinc Oxide-Thin Film Transistors.

Fan Zhang1, Luxi Zhang2, Jie Xia3

  • 1Key Laboratory of Biomedical Engineering of Ministry of Education, Qiushi Academy for Advanced Studies, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China.

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Researchers developed a transparent electrocorticogram (ECoG) array using zinc oxide thin-film transistors (ZnO TFTs) for enhanced neural signal recording. This innovation enables simultaneous optical and 7-Tesla magnetic resonance imaging (MRI) brain observation.

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electrocorticogramneural recordingoptogeneticthin-film-transistorstransparent electrodes

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Area of Science:

  • Neuroscience
  • Materials Science
  • Biomedical Engineering

Background:

  • Traditional active electrocorticogram (ECoG) electrodes are opaque, limiting collaborative photoelectric observation.
  • There is a need for advanced ECoG arrays that offer high transparency and improved signal quality for multimodal brain monitoring.

Purpose of the Study:

  • To develop a fully transparent ECoG array using zinc oxide thin-film transistors (ZnO TFTs).
  • To evaluate the performance of the transparent ECoG array for electrophysiological signal amplification and anti-interference capabilities.
  • To demonstrate the array's utility in multimodal brain observation, including optical stimulation and 7-Tesla MRI.

Main Methods:

  • Fabrication of an active and fully transparent ECoG array utilizing ZnO TFTs.
  • Electrical characterization of the ECoG array to assess signal-to-noise ratio (SNR) and amplification.
  • Concurrent recording of electrophysiological signals under optical stimulation in optogenetic mice.
  • Testing the ECoG array's compatibility with 7-Tesla magnetic resonance imaging (MRI).

Main Results:

  • The transparent ECoG array achieved up to 85% transparency, surpassing previous active electrode arrays.
  • Electrophysiological recordings showed a higher SNR (19.9 dB) compared to traditional gold (Au) grids (13.2 dB).
  • High-quality electrophysiological signals (32.2 dB SNR) were recorded under direct optical stimulation.
  • The ZnO-TFT ECoG array successfully recorded local brain signals during 7-Tesla MRI without compromising image quality.

Conclusions:

  • The developed transparent ECoG array offers superior transparency and signal recording capabilities.
  • This technology enables multimodal brain observation, including synchronized optical modulation and high-field MRI.
  • The transparent ZnO-TFT ECoG array represents a significant advancement for neurophysiological monitoring and research.