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Schottky-gated transistors using chitosan extracted from marine crab
Mikio Fukuhara1, Tomonori Yokotsuka2, Nobuyuki Kobayashi3
1New Industry Creation Hatchery Center, Tohoku University, Aoba, Sendai, 980-8579, Japan. mikio.fukuhara.b2@tohoku.ac.jp.
Scientific Reports
|December 20, 2025
Summary
Amorphous chitosan nanoparticles from crab shells function as semiconductors in paper electronics. These novel materials show promise for flexible, biodegradable devices with energy storage capabilities.
Area of Science:
- Materials Science
- Electronics Engineering
- Biomaterials
Background:
- Chitosan nanoparticles (AChNPs) are derived from marine crab shells.
- There is a growing need for sustainable and biodegradable materials in the electronics industry.
- Paper-based electronics offer a promising platform for low-cost, flexible devices.
Purpose of the Study:
- To investigate the potential of amorphous chitosan nanoparticles (AChNPs) as active semiconductor materials for paper-based electronics.
- To characterize the electrical properties of AChNPs and their performance in electronic devices.
- To explore the feasibility of using AChNPs in diodes and metal-semiconductor field-effect transistors (MESFETs).
Main Methods:
- Extraction and preparation of amorphous chitosan nanoparticles (AChNPs) from marine crab shells.
- Fabrication of Schottky junctions and MESFETs using AChNPs as the semiconductor layer.
- Electrical characterization including current-voltage (I-V) measurements and Hall effect measurements.
- Electron spin resonance (ESR) and photoemission yield spectroscopy for material analysis.
Main Results:
- AChNPs exhibit electron-driven rectifying behavior at Schottky junctions.
- MESFETs fabricated with AChNPs demonstrated significant amplification (three orders of magnitude) and a high on/off current ratio (~17,000).
- Hall effect measurements confirmed n-type semiconducting behavior with specific carrier concentration, mobility, and resistivity values.
- ESR and photoemission spectroscopy identified the source of electrons and determined the material's band gap energy (5.21 eV).
Conclusions:
- Amorphous chitosan nanoparticles are viable semiconductor materials for paper-based electronics.
- The developed AChNP-based diodes and MESFETs show excellent performance characteristics.
- These findings highlight the potential of AChNPs for creating flexible, renewable, and biodegradable electronic devices with energy storage capabilities.
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