Tailored electrochemical synthesis of 2D-hexagonal, lamellar, and cage-type mesostructured Pt thin films with extralarge periodicity

Azusa Takai; Yusuke Yamauchi; Kazuyuki Kuroda

doi:10.1021/ja9062844

Tailored electrochemical synthesis of 2D-hexagonal, lamellar, and cage-type mesostructured Pt thin films with extralarge periodicity

Azusa Takai, Yusuke Yamauchi^*, Kazuyuki Kuroda

^*Corresponding author for this work

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

59 Citations (Scopus)

Abstract

We report the synthesis of mesostructured Pt films with extralarge periodicity from lyotropic liquid crystals consisting of block copolymers (polystyrene-b-polyethylene oxide, PS-b-PEO) on Au substrates by electrochemical deposition. The Pt films with three types of (two-dimensional (2D)-hexagonal, lamellar, and cage-type) mesostructures are successfully synthesized by controlling the compositional ratio between block copolymers and Pt species in precursor solutions. The mesostructured Pt films have high electrochemically active surface areas. The bumpy mesopore surfaces, which reflect the mesopore walls consisting of connected nanoparticles, greatly contribute to the enhancement of the surface areas. The mesopore walls have single crystal domains over 400 nm² region proved by the lattice fringes of Pt extending over several nanoparticles.

Original language	English
Pages (from-to)	208-214
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	132
Issue number	1
DOIs	https://doi.org/10.1021/ja9062844
Publication status	Published - 2010 Jan 13
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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AU - Yamauchi, Yusuke

AU - Kuroda, Kazuyuki

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AB - We report the synthesis of mesostructured Pt films with extralarge periodicity from lyotropic liquid crystals consisting of block copolymers (polystyrene-b-polyethylene oxide, PS-b-PEO) on Au substrates by electrochemical deposition. The Pt films with three types of (two-dimensional (2D)-hexagonal, lamellar, and cage-type) mesostructures are successfully synthesized by controlling the compositional ratio between block copolymers and Pt species in precursor solutions. The mesostructured Pt films have high electrochemically active surface areas. The bumpy mesopore surfaces, which reflect the mesopore walls consisting of connected nanoparticles, greatly contribute to the enhancement of the surface areas. The mesopore walls have single crystal domains over 400 nm2 region proved by the lattice fringes of Pt extending over several nanoparticles.

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Tailored electrochemical synthesis of 2D-hexagonal, lamellar, and cage-type mesostructured Pt thin films with extralarge periodicity

Abstract

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