Enhancement of proton transport in an oriented polypeptide thin film

Yuki Nagao; Jun Matsui; Takashi Abe; Hirotsugu Hiramatsu; Hitoshi Yamamoto; Tokuji Miyashita; Noriko Sata; Hiroo Yugami

doi:10.1021/la400412f

Enhancement of proton transport in an oriented polypeptide thin film

Yuki Nagao, Jun Matsui, Takashi Abe, Hirotsugu Hiramatsu, Hitoshi Yamamoto, Tokuji Miyashita, Noriko Sata, Hiroo Yugami

ENG - Mechanical Systems Engineering

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

Proton transport properties of a partially protonated poly(aspartic acid)/sodium polyaspartate (P-Asp) were investigated. A remarkable enhancement of proton conductivity has been achieved in the thin film. Proton conductivity of 60-nm-thick thin film prepared on MgO(100) substrate was 3.4 × 10 ^-3 S cm^-1 at 298 K. The electrical conductivity of the oriented thin film was 1 order of magnitude higher than the bulk specimen, and the activation energies for the proton conductivity were 0.34 eV for the oriented thin film and 0.65 eV for the pelletized sample, respectively. This enhancement of the proton transport is attributable to the highly oriented structure on MgO(100) substrate. This result proposes great potential for a new strategy to produce a highly proton-conductive material using the concept of an oriented thin film structure without strong acid groups.

Original language	English
Pages (from-to)	6798-6804
Number of pages	7
Journal	Langmuir
Volume	29
Issue number	23
DOIs	https://doi.org/10.1021/la400412f
Publication status	Published - 2013 Jun 11

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title = "Enhancement of proton transport in an oriented polypeptide thin film",

abstract = "Proton transport properties of a partially protonated poly(aspartic acid)/sodium polyaspartate (P-Asp) were investigated. A remarkable enhancement of proton conductivity has been achieved in the thin film. Proton conductivity of 60-nm-thick thin film prepared on MgO(100) substrate was 3.4 × 10 -3 S cm-1 at 298 K. The electrical conductivity of the oriented thin film was 1 order of magnitude higher than the bulk specimen, and the activation energies for the proton conductivity were 0.34 eV for the oriented thin film and 0.65 eV for the pelletized sample, respectively. This enhancement of the proton transport is attributable to the highly oriented structure on MgO(100) substrate. This result proposes great potential for a new strategy to produce a highly proton-conductive material using the concept of an oriented thin film structure without strong acid groups.",

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T1 - Enhancement of proton transport in an oriented polypeptide thin film

AU - Nagao, Yuki

AU - Matsui, Jun

AU - Abe, Takashi

AU - Hiramatsu, Hirotsugu

AU - Yamamoto, Hitoshi

AU - Miyashita, Tokuji

AU - Sata, Noriko

AU - Yugami, Hiroo

PY - 2013/6/11

Y1 - 2013/6/11

N2 - Proton transport properties of a partially protonated poly(aspartic acid)/sodium polyaspartate (P-Asp) were investigated. A remarkable enhancement of proton conductivity has been achieved in the thin film. Proton conductivity of 60-nm-thick thin film prepared on MgO(100) substrate was 3.4 × 10 -3 S cm-1 at 298 K. The electrical conductivity of the oriented thin film was 1 order of magnitude higher than the bulk specimen, and the activation energies for the proton conductivity were 0.34 eV for the oriented thin film and 0.65 eV for the pelletized sample, respectively. This enhancement of the proton transport is attributable to the highly oriented structure on MgO(100) substrate. This result proposes great potential for a new strategy to produce a highly proton-conductive material using the concept of an oriented thin film structure without strong acid groups.

AB - Proton transport properties of a partially protonated poly(aspartic acid)/sodium polyaspartate (P-Asp) were investigated. A remarkable enhancement of proton conductivity has been achieved in the thin film. Proton conductivity of 60-nm-thick thin film prepared on MgO(100) substrate was 3.4 × 10 -3 S cm-1 at 298 K. The electrical conductivity of the oriented thin film was 1 order of magnitude higher than the bulk specimen, and the activation energies for the proton conductivity were 0.34 eV for the oriented thin film and 0.65 eV for the pelletized sample, respectively. This enhancement of the proton transport is attributable to the highly oriented structure on MgO(100) substrate. This result proposes great potential for a new strategy to produce a highly proton-conductive material using the concept of an oriented thin film structure without strong acid groups.

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Enhancement of proton transport in an oriented polypeptide thin film

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