Controlling Proton Conductivity with Light: A Scheme Based on Photoacid Doping of Materials

The Journal of Physical Chemistry. B
Shima HaghighatJahan M Dawlaty

Abstract

Transducing light energy to changes in material properties is central to a large range of functional materials, including those used in light harvesting. In conventional semiconductors, photoconductivity arises due to generation of mobile electrons or holes with light. Here we demonstrate, to our knowledge for the first time, an analogue of this effect for protons in an organic polymer solution and in water. We show that when a material is doped with photoacids, light excitation generates extra mobile protons that change the low-frequency conductivity of the material. We measure such change both in poly(ethylene glycol) (PEG) and in water sandwiched between two transparent electrodes and doped with a well-known photoacid 8-hydroxypyrene-1,3,6-trisulfonic acid (HPTS). The complex impedance of the material is measured over a range of 0.1 Hz-1 MHz in both the presence and absence of light, and it is found that shining light changes the low frequency impedance significantly. We model the impedance spectra of the material with a minimal circuit composed of a diffusive impedance (Warburg element), a parallel capacitance, and a resistance. Fitting the light and dark impedance spectra to the model reveals that light reduces the low-fre...Continue Reading

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Citations

May 20, 2016·The Journal of Physical Chemistry Letters·Eric William DriscollJahan M Dawlaty
Oct 18, 2016·Chemical Communications : Chem Comm·Zhijun ChenSi Wu
May 10, 2017·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Trevor M SafkoRichard G Weiss
Apr 11, 2017·Angewandte Chemie·Sanjog S NagarkarSusumu Kitagawa
Jan 10, 2018·Advanced Materials·Kai MüllerLars Heinke
Sep 29, 2020·Chemistry : a European Journal·Maria SittigBenjamin Dietzek
Jan 16, 2021·Journal of Fluorescence·Abbas Mohammed AliLing-Ling Qu
May 1, 2021·Chemistry : a European Journal·Christoph KaiserJosef Wachtveitl
Sep 13, 2018·The Journal of Physical Chemistry. a·Jonathan Ryan Hunt, Jahan M Dawlaty
Nov 12, 2019·The Journal of Physical Chemistry. a·Jonathan Ryan Hunt, Jahan M Dawlaty
Apr 18, 2017·Journal of the American Chemical Society·William WhiteShane Ardo
Sep 8, 2021·Angewandte Chemie·Alex Burnstine-TownleyNadav Amdursky

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