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High-Performance UV Enhancer Molecules Coupled with Photosynthetic Proteins for Ultra-Low-Intensity UV Detection

Research output: Contribution to journalArticle

  • Lakshmi Suresh
  • Jayraj Vaghasiya
  • Dilip Krishna Nandakumar
  • Tingfeng Wu
  • Mike Jones
  • Swee Ching Tan
Original languageEnglish
JournalChem
Early online date16 May 2019
DOIs
DateAccepted/In press - 18 Apr 2019
DateE-pub ahead of print (current) - 16 May 2019

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.

    Research areas

  • bio-photoelectrochemical cell, FRET, organic UV enhancer molecule, UV detector, ultra-low intensity UV detection, photosynthetic proteins, organic ionic conductors

Documents

Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Cell Press at https://www.sciencedirect.com/science/article/abs/pii/S2451929419301755 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF-document

    Embargo ends: 16/05/20

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    Licence: CC BY-NC-ND

DOI

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