期刊
MATERIALS TRANSACTIONS
卷 56, 期 4, 页码 468-472出版社
JAPAN INST METALS
DOI: 10.2320/matertrans.MF201403
关键词
nanoporous gold; environmental factors; thermal coarsening; catalytic materials; environmental transmission electron microscopy
资金
- KAKENHI [25708036]
- Inter-university Cooperative Research Program of the Institute for Materials Research, Tohoku University [11K0072, 12K0100, 13G0042, 14G0031]
- Advanced Characterization Nanotechnology Platform of the High Voltage Electron Microscope Laboratory of Nagoya University
- Hi-tech Research Center of Tohoku Gakuin University
- Grants-in-Aid for Scientific Research [25708036] Funding Source: KAKEN
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 degrees C), the coarsening of ligaments/pores was triggered by introducing either pure N-2 or O-2 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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