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Abstract
Dual attributes of UV-photo-responsive organic-ionic conductors are exploited in bio-photoelectrochemical cells based on photosynthetic RC-LH1 proteins from Rhodobacter sphaeroides. These UV enhancer molecules (UVEM) can generate small photocurrents in the absence of protein and are also effective electrolytes for photocurrent generation by RC-LH1 complexes in response to near-infrared excitation. Mixing RC-LH1 and UVEM components strongly enhanced UV photocurrents relative to those obtained with protein or UVEM alone, an effect that is attributed to energy transfer from the hetero-anthracene chromophore of the UVEM to the carotenoids of the RC-LH1 complex. RC-LH1/UVEM bio-photoelectrochemical cells were superior to conventional RC-LH1 cells in terms of UV external quantum efficiency, photo-response sensitivity, and photocurrent rise-decay times. These bio-photodetectors could detect weak UV radiation with intensities as low as 2 μW/cm2. This combination of photosynthetic proteins with dual-function electrolytes is the first attempt to construct fully functional bio-photoelectrochemical UV photodetector based on natural components.
Original language | English |
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Pages (from-to) | 1847-1860 |
Number of pages | 14 |
Journal | Chem |
Volume | 5 |
Issue number | 7 |
Early online date | 16 May 2019 |
DOIs | |
Publication status | Published - 11 Jul 2019 |
Structured keywords
- BrisSynBio
- Bristol BioDesign Institute
Keywords
- bio-photoelectrochemical cell
- FRET
- organic ionic conductors
- organic UV enhancer molecule
- photosynthetic proteins
- SDG7: Affordable and clean energy
- ultra-low intensity UV detection
- UV detector
- Synthetic biology
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