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Amorphous semiconductor switching in melanins
Science (New York, N.Y.)
|March 1, 1974
Summary
Melanins, both synthetic and biological, function as amorphous semiconductor threshold switches. They exhibit reversible switching at significantly lower potential gradients than inorganic materials, suggesting potential biological applications.
Area of Science:
- Biophysics
- Materials Science
- Organic Electronics
Background:
- Melanins are biopolymers with unique electronic properties.
- Amorphous semiconductors are crucial for various electronic devices.
- Understanding biological material conductivity is key for bio-integrated electronics.
Purpose of the Study:
- To investigate the electrical switching behavior of melanins.
- To compare melanin's semiconductor properties with inorganic thin films.
- To explore potential biological applications of melanin-based switches.
Main Methods:
- Synthesized and isolated melanins were subjected to electrical potential gradients.
- Switching behavior was observed and analyzed.
- Other biological materials, including cytochrome c, were tested for comparison.
Main Results:
- Melanins exhibit amorphous semiconductor threshold switching behavior.
- Switching occurred at potential gradients 100-1000 times lower than inorganic thin films.
- Cytochrome c showed similar switching but required much higher gradients.
Conclusions:
- Melanins act as efficient amorphous semiconductor threshold switches.
- Their low operating potential gradients are comparable to biological systems.
- Melanins show promise for bio-electronic applications.