کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1419757 986064 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A method for characterization and quantification of platelet graphite nanofiber edge crystal structure
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
A method for characterization and quantification of platelet graphite nanofiber edge crystal structure
چکیده انگلیسی

Platelet graphite nanofibers are materials produced from the decomposition of carbon monoxide and hydrogen over iron powders. The surface consists of terminated graphite edges, differing from traditional graphite materials in which basal plane graphite surfaces dominate. The 3-dimensional morphology and crystal face exposure on the nanofiber surface was determined by selected area electron diffraction studies. From orientation of the 〈101¯0〉 “zigzag” and 〈112¯0〉 “armchair” directions, the concentration of {112¯0} and {101¯0} face families on the fiber surface, along with the overall geometry and shape of the nanofibers, were determined. To overcome the problem of large aspect ratio in such materials, the fibers were cleaved along the basal plane, which was oriented perpendicular to the fiber axis. Effectively, the materials were transformed into multiple single crystal graphite structures. The cleaved samples, because of the decreased depth of field, were then observed end on using transmission electron microscopy techniques. It was found that the zigzag/armchair face ratio for most observed structures was ∼1.7/1, but some samples deviated from this ratio. Such knowledge is useful in discerning types of graphite surfaces are exposed when nanostructured carbons are used as catalysts and catalyst supports.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 44, Issue 11, September 2006, Pages 2184–2190
نویسندگان
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