Determination of Nanocluster Sizes from Dark-Field Scanning Transmission Electron Microscopy Images

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• 作者：Norihiko L. Okamoto ; Bryan W. Reed ; Shareghe Mehraeen ; Apoorva Kulkarni ; David Gene Morgan ; Bruce C. Gates ; Nigel D. Browning
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：February 14, 2008
• 年：2008
• 卷：112
• 期：6
• 页码：1759 - 1763
• 全文大小：283K
• 年卷期：v.112,no.6(February 14, 2008)
• ISSN：1932-7455

文摘

A novel method of determining nanocluster sizes and size distributions using high-angle annular dark-fieldimaging in scanning transmission electron microscopy is described. This method is demonstrated for MgO-supported [Os₁₀C(CO)₂₄]^2- clusters formed by treating Os₃(CO)₁₂ precursors in CO. The image analysisidentified the presence of both Os₃(CO)₁₂ precursors and [Os₁₀C(CO)₂₄]^2- clusters in the expected ratio (withthe sizes matching those calculated on the basis of their crystallographically determined structures within6%) and also larger clusters that can be readily identified as combinations of the former clusters.