Broadband Plasmonic Photocurrent Enhancement from Photosystem i Assembled with Tailored Arrays of Au and Ag Nanodisks

Ravi Pamu, Benjamin J. Lawrie, Bamin Khomami, Dibyendu Mukherjee

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Plasmonic interactions between metal nanostructures and fluorophores have been increasingly employed to alter photoexcitation pathways in multichromophore photosynthetic proteins like photosystem I (PSI). Our recent experimental studies demonstrated a sixfold plasmon-enhanced photocurrent from PSI assembled on Fischer patterns of Ag nanopyramids. However, lack of control over the specific resonance modes limited the magnitude and selectivity of the plasmonic enhancement. To this end, the present study investigates the excitation wavelength-dependent plasmon-enhanced photocurrents from PSI immobilized around highly ordered Au (AuND) and Ag (AgND) nanodisks with dipolar plasmon resonances that are tuned to ∼680 and 560 nm, respectively. Specifically, we report plasmon-induced photocurrent enhancements of ∼6.8 and 17.5 for excitation wavelengths of ∼680 and 565 nm, respectively, as compared to PSI assembled on planar ITO substrates. We also report the action spectra for photocurrent enhancements recorded over wavelengths of 395-810 nm with nine discrete LED light sources. The results indicate the following: (1) concurrence between the photocurrent-enhancement spectra from PSI assemblies and the plasmonic resonances for the respective nanopatterned substrates, and (2) broadband photocurrent enhancements due to plasmon-coupled photoactivation in the otherwise blind chlorophyll regions of the native PSI absorption spectra. These intriguing findings pave the path for rational assembly of future biohybrid structures composed of natural light-harvesting antennae and plasmonic metal nanostructures.

Original languageEnglish
Pages (from-to)1209-1219
Number of pages11
JournalACS Applied Nano Materials
Volume4
Issue number2
DOIs
StatePublished - Feb 26 2021

Bibliographical note

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Keywords

  • biohybrid optoelectronics
  • bionanotechnology
  • broadband photocurrents
  • gold and silver nanostructures
  • optically active materials
  • photosystem I
  • surface plasmon resonance

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