An Electronic and Optically Controlled Bifunctional Transistor Based on a Bio-Nano Hybrid Complex

Area of Science:

• Bioelectronics
• Materials Science
• Nanotechnology

Background:

• Bioelectronic field-effect transistors (FETs) offer potential for novel electronic devices.
• Hybrid materials combining biological and nanomaterial components are of significant interest.

Purpose of the Study:

• To create an electronically and optically controlled bioelectronic FET.
• To investigate the properties of a hybrid film composed of bacteriorhodopsin and single-walled carbon nanotubes (SWNTs).

Main Methods:

• Fabrication of a bioelectronic transistor using a hybrid film of photoactive bacteriorhodopsin and SWNTs.
• Characterization of the hybrid material using Raman spectroscopy to assess electronic doping.
• Testing of the transistor's performance under both electronic and optical gating.

Main Results:

• The hybrid film exhibited electronic doping with a charge density of 3 × 10^6 cm^-2.
• The bioelectronic transistor displayed semiconducting characteristics with a conductivity of 19 μS/m.
• The device showed significant optical and electronic gating with an on/off switch ratio of 8.5 and photoconductivity of 13.15 μS/m.

Conclusions:

• The developed bioelectronic transistor demonstrates bifunctional control through both electronic and optical means.
• Optically controlled electronic doping by bacteriorhodopsin enables complementary p-type characteristics under light.
• This hybrid material approach is promising for advanced bio-nano electronic devices.