Tuning the photocurrent generations from photosystem I assembled in tailored biotic-abiotic interfaces
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Research Letter
Tuning the photocurrent generations from photosystem I assembled in tailored biotic–abiotic interfaces Hanieh Niroomand, Department of Chemical and Biomolecular Engineering; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA* Ravi Pamu, Department of Mechanical, Aerospace, and Biomedical Engineering; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3), University of Tennessee, Knoxville, TN 37996, USA* Dibyendu Mukherjee, Department of Mechanical, Aerospace, and Biomedical Engineering; Department of Chemical and Biomolecular Engineering; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA Bamin Khomami, Department of Chemical and Biomolecular Engineering; Department of Mechanical, Aerospace, and Biomedical Engineering; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA Address all correspondence to Bamin Khomami and Dibyendu Mukherjee at [email protected], [email protected] (Received 2 February 2018; accepted 16 April 2018)
Abstract Rational design of bio-hybrid photovoltaic and/or optoelectronic devices requires systematic electrochemical characterizations of photosystem I (PSI), the photosynthetic membrane protein, assembled onto tailored biotic–abiotic interfaces. This work communicates our research findings on the role of PSI microenvironment alterations at organic/inorganic interfaces, via biomimetic lipid membrane confinements and plasmonic coupling with Ag nano-pyramid structures, in tuning the photoactivated charge separation and photocurrent generations from surface-assembled PSI. The observed photocurrent enhancements and the associated mechanistic insights from this study will facilitate the future design of tailored interfaces that can optimally tune the photoactivity and photostability of PSI in solid-state bioelectronics.
Introduction Photosystem I (PSI), the photosynthetic membrane protein, goes through light-activated charge separation and unidirectional electron transfer with near-unity quantum efficiency. Based on the experimental photocurrent measurement of single PSI under specially designed conditions and theoretical photocurrent estimates due to its ultrafast excitation rates, it can reach up to few mA/cm2 of photocurrent even from PSI monolayers.[1,2] Due to its great potential, robust structural, and photoelectrochemical (PEC) activities, PSI is an ideal biomaterial for bio-hybrid photovoltaic and/or optoelectronic devices. However, the first step toward the rational design of such devices demands systematic electrochemical characterizations of PSI assembly in tailored biotic–abiotic interfaces. In recent years, research has been directed toward immobilizing PSI onto conductive material [gold, titanium oxide, silicon, graphene, or gallium (III) arsenide, carbon nanotubes or other nanoparticles, and redox polymers]
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