Journal
JOURNAL OF ELECTRON MICROSCOPY
Volume 61, Issue 4, Pages 199-206Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jmicro/dfs041
Keywords
in situ observation; analytical TEM; humid atmosphere; gas injection; specimen heating holder; catalyst
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Funding
- Japan Society for the Promotion of Science (JSPS) [23510136]
- Grants-in-Aid for Scientific Research [23510136] Funding Source: KAKEN
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To clarify the influence of moisture on the structural changes of heated nano materials, in situ high temperature transmission electron microscopy (TEM) has been carried out using a conventional analytical TEM combined with a gas injection-specimen heating holder. Air with high moisture content, above 94% relative humidity (RH), from a humidifier was directly injected onto the heated platinum catalyst dispersed on carbon black (Pt/CB), and the morphological changes of the specimens were observed at high magnification dynamically. The result of the experiment was compared with a result obtained from an experiment using air with a low moisture content, 34% RH. Active movement of the Pt particles, leading agglomeration and grain growth, occurred prior to degradation of the CB support at high moisture content. In contrast, the degradation of the CB support leading agglomeration and grain growth of the Pt particles occurred before the displacement of the Pt particles on the CB supports in a low humidity environment.
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