کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1440717 1509379 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hall effect in carbon nanotube thin films
ترجمه فارسی عنوان
اثر هال در فیلم های نازک کربن نانو
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
چکیده انگلیسی

We have investigated Hall coefficient and magnetoresistance in thin films of single-walled carbon nanotubes, prepared in four different ways. Hall voltages are linear for all samples in magnetic fields up to 6 T, and the measured carrier density lies in ∼1021–1022 cm−3. Whereas earlier Hall-effect experiments reported ∼1018–1019 cm−3 for the carrier density, our results are consistent with the theoretically predicted value of ∼1022 cm−3, calculated for the aligned metallic CNTs. The signs of the Hall coefficients are positive in general, indicating that majority carriers are holes in these films. In a nanotube film with the lowest conductivity, however, we find the Hall coefficient reverses the sign at low temperature around T = 15 K. The origin of the sign change is not clear. In strongly localized regime, the Hall effect can be anomalous.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 198, December 2014, Pages 84–87
نویسندگان
, , , , , , ,