کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1417572 985973 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transport properties of hot-pressed bulk carbon nanotubes compacted by spark plasma sintering
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Transport properties of hot-pressed bulk carbon nanotubes compacted by spark plasma sintering
چکیده انگلیسی

Electrical and thermal transport properties of the carbon nanotube bulk material compacted by spark plasma sintering have been investigated. The electrical conductivity of the as-prepared sample shows a lnT dependence from 4 to 50 K, after which the conductivity begins to increase approximately linearly with temperature. A magnetic field applied perpendicularly to the sample increases the electrical conductivity in the range of 0-8T at all testing temperatures, indicating that the sample possesses the two-dimensional weak localization at lower temperatures (⩽50 K), while behaviors like a semimetal at higher temperatures (⩾50 K). This material acts like a uniform compact consisting of randomly distributed two dimensional graphene layers. For the same material, the thermal conductivity is found to decrease almost linearly with decreasing temperature, similar to that of a single multi-walled carbon nanotube. Magnetic fields applied perpendicularly to the sample cause the thermal conductivity to decrease significantly, but the influence of the magnetic fields becomes weak when temperature increases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 47, Issue 4, April 2009, Pages 1135–1140
نویسندگان
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