Photosynthetic Reaction-Center/Graphene Biohybrid for Optoelectronics

Area of Science:

• Bio-photonic devices
• Photosynthesis
• Materials science

Background:

• Photosynthetic reaction center proteins (RC) are crucial for light energy conversion.
• Graphene is a promising material for electronic applications due to its unique properties.
• Hybrid bio-photonic devices integrating biological and electronic components are of great interest.

Purpose of the Study:

• To investigate the electronic interaction between photosynthetic reaction center proteins and graphene.
• To understand how light absorption by proteins affects graphene's electrical properties.
• To provide insights for designing advanced bio-photonic devices.

Main Methods:

• Purification of photosynthetic reaction center proteins from purple bacteria.
• Deposition of proteins onto graphene layers prepared by liquid phase exfoliation.
• Measurement of light-induced resistance changes in graphene, analyzing temperature dependence.

Main Results:

• Separation of temperature-dependent resistance changes from protein-induced effects.
• Evidence of electric/electronic interaction between graphene charge flow and light-induced protein charge pairs.
• Distinct electronic states observed in the protein (PBPheo in dark vs. P+BPheo- in light).

Conclusions:

• Demonstrated a direct electronic interaction between photosynthetic proteins and graphene.
• Highlighted the potential for light-induced charge transfer across the bio-graphene interface.
• Results offer valuable data for the development of hybrid bio-photonic devices for light energy harvesting.