PMID: 11607515Mar 14, 1995Paper

Molecular electronics of a single photosystem I reaction center: studies with scanning tunneling microscopy and spectroscopy

Proceedings of the National Academy of Sciences of the United States of America
I LeeE Greenbaum

Abstract

Thylakoids and photosystem I (PSI) reaction centers were imaged by scanning tunneling microscopy. The thylakoids were isolated from spinach chloroplasts, and PSI reaction centers were extracted from thylakoid membranes. Because thylakoids are relatively thick nonconductors, they were sputter-coated with Pd/Au before imaging. PSI photosynthetic centers and chemically platinized PSI were investigated without sputter-coating. They were mounted on flat gold substrates that had been treated with mercaptoacetic acid to help bind the proteins. With tunneling spectroscopy, the PSI centers displayed a semiconductor-like response with a band gap of 1.8 eV. Lightly platinized (platinized for 1 hr) centers displayed diode-like conduction that resulted in dramatic contrast changes between images taken with opposite bias voltages. The electronic properties of this system were stable under long-term storage.

References

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Citations

Jun 14, 2005·Micron : the International Research and Review Journal for Microscopy·Frantisek VachaMartin Vacha
Sep 12, 1998·Biochimica Et Biophysica Acta·P KernenZ Krupa
Feb 15, 2005·Colloids and Surfaces. B, Biointerfaces·Jianwei Zhao, Jason J Davis
Jan 6, 2018·Reports on Progress in Physics·Christopher D BostickDavid Lederman
Jul 17, 2019·Angewandte Chemie·Montse López-MartínezPau Gorostiza
Aug 11, 2021·Journal of the American Chemical Society·Ryotaro FuruyaMartin Vacha
Jul 17, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Emily DarbyDavid E Cliffel
Mar 1, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Gabriel LeBlancG Kane Jennings
Jun 10, 2015·Journal of the American Chemical Society·Olga E Castañeda OcampoRyan C Chiechi
Oct 18, 2007·The Journal of Physical Chemistry. B·Nicholas S WiggintonMichael F Hochella

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