Proton Conduction in a Tyrosine-Rich Peptide/Manganese Oxide Hybrid Nanofilm

Jaehun Lee, Ik Rang Choe, Young O. Kim, Seok Daniel Namgung, Kyoungsuk Jin, Hyo Yong Ahn, Taehoon Sung, Jang Yeon Kwon, Yoon Sik Lee, Ki Tae Nam

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Proton conduction is an essential process that regulates an integral part of several enzymatic catalyses and bioenergetics. Proton flows in biological entities are sensitively controlled by several mechanisms. To understand and manipulate proton conduction in biosystems, several studies have investigated bulk proton conduction in biomaterials such as polyaspartic acid, collagen, reflectin, serum albumin mats, and eumelanin. However, little is known about the bulk proton conductivity of short peptides and their sequence-dependent behavior. Here, this paper focuses on a short tyrosine-rich peptide that has redox-active and cross-linkable phenol groups. The spin-coated peptide nanofilm is immersed in potassium permanganate solution to induce cross-linking and oxidation, simultaneously leading to hybridization with manganese oxide (MnOx). The peptide/MnOx hybrid nanofilm can efficiently transport protons, and its proton conductivity is ≈18.6 mS cm−1 at room temperature. This value is much higher than that of biomaterials and comparable to those of other synthetic proton-conducting materials. These results suggest that peptide-based hybrid materials can be a promising new class of proton conductor.

Original languageEnglish
Article number1702185
JournalAdvanced Functional Materials
Issue number35
Publication statusPublished - 2017 Sept 20
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • hybrid materials
  • manganese oxides
  • peptides
  • proton conductors
  • tyrosines

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Electrochemistry
  • Biomaterials


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