Environment-sensitive thermal coarsening of nanoporous gold

Satoko Kuwano-Nakatani; Takeshi Fujita; Kazuki Uchisawa; Daichi Umetsu; Yu Kase; Yusuke Kowata; Katsuhiko Chiba; Tomoharu Tokunaga; Shigeo Arai; Yuta Yamamoto; Nobuo Tanaka; Mingwei Chen

doi:10.2320/matertrans.MF201403

Environment-sensitive thermal coarsening of nanoporous gold

Satoko Kuwano-Nakatani, Takeshi Fujita, Kazuki Uchisawa, Daichi Umetsu, Yu Kase, Yusuke Kowata, Katsuhiko Chiba, Tomoharu Tokunaga, Shigeo Arai, Yuta Yamamoto, Nobuo Tanaka, Mingwei Chen

Advanced Institute for Materials Research (AIMR)

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

15 Citations (Scopus)

Abstract

In order to investigate environmental effects on the ligament/pore coarsening of nanoporous gold (NPG), we studied the thermal coarsening of NPG both in air and vacuum by ex situ observation, and found that it has high structural stability against heat treatment in vacuum. To clarify the nature of this phenomenon, we investigated the thermal coarsening of NPG by in situ environmental transmission electron microscopy. At an elevated temperature (400°C), the coarsening of ligaments/pores was triggered by introducing either pure N₂ or O₂ gas into the transmission electron microscopy (TEM) chamber (but not by Ar gas). We thus conclude with a discussion on the mechanism for thermal coarsening of NPG.

Original language	English
Pages (from-to)	468-472
Number of pages	5
Journal	Materials Transactions
Volume	56
Issue number	4
DOIs	https://doi.org/10.2320/matertrans.MF201403
Publication status	Published - 2015

Keywords

Catalytic materials
Environmental factors
Environmental transmission electron microscopy
Nanoporous gold
Thermal coarsening

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Environment-sensitive thermal coarsening of nanoporous gold. / Kuwano-Nakatani, Satoko; Fujita, Takeshi; Uchisawa, Kazuki; Umetsu, Daichi; Kase, Yu; Kowata, Yusuke; Chiba, Katsuhiko; Tokunaga, Tomoharu; Arai, Shigeo; Yamamoto, Yuta; Tanaka, Nobuo; Chen, Mingwei.

In: Materials Transactions, Vol. 56, No. 4, 2015, p. 468-472.

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

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abstract = "In order to investigate environmental effects on the ligament/pore coarsening of nanoporous gold (NPG), we studied the thermal coarsening of NPG both in air and vacuum by ex situ observation, and found that it has high structural stability against heat treatment in vacuum. To clarify the nature of this phenomenon, we investigated the thermal coarsening of NPG by in situ environmental transmission electron microscopy. At an elevated temperature (400°C), the coarsening of ligaments/pores was triggered by introducing either pure N2 or O2 gas into the transmission electron microscopy (TEM) chamber (but not by Ar gas). We thus conclude with a discussion on the mechanism for thermal coarsening of NPG.",

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AU - Kuwano-Nakatani, Satoko

AU - Fujita, Takeshi

AU - Uchisawa, Kazuki

AU - Umetsu, Daichi

AU - Kase, Yu

AU - Kowata, Yusuke

AU - Chiba, Katsuhiko

AU - Tokunaga, Tomoharu

AU - Arai, Shigeo

AU - Yamamoto, Yuta

AU - Tanaka, Nobuo

AU - Chen, Mingwei

PY - 2015

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N2 - In order to investigate environmental effects on the ligament/pore coarsening of nanoporous gold (NPG), we studied the thermal coarsening of NPG both in air and vacuum by ex situ observation, and found that it has high structural stability against heat treatment in vacuum. To clarify the nature of this phenomenon, we investigated the thermal coarsening of NPG by in situ environmental transmission electron microscopy. At an elevated temperature (400°C), the coarsening of ligaments/pores was triggered by introducing either pure N2 or O2 gas into the transmission electron microscopy (TEM) chamber (but not by Ar gas). We thus conclude with a discussion on the mechanism for thermal coarsening of NPG.

AB - In order to investigate environmental effects on the ligament/pore coarsening of nanoporous gold (NPG), we studied the thermal coarsening of NPG both in air and vacuum by ex situ observation, and found that it has high structural stability against heat treatment in vacuum. To clarify the nature of this phenomenon, we investigated the thermal coarsening of NPG by in situ environmental transmission electron microscopy. At an elevated temperature (400°C), the coarsening of ligaments/pores was triggered by introducing either pure N2 or O2 gas into the transmission electron microscopy (TEM) chamber (but not by Ar gas). We thus conclude with a discussion on the mechanism for thermal coarsening of NPG.

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KW - Environmental transmission electron microscopy

KW - Nanoporous gold

KW - Thermal coarsening

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Environment-sensitive thermal coarsening of nanoporous gold

Abstract

Keywords

ASJC Scopus subject areas

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