کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9837302 | 1525273 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrical and magnetic properties of polyaniline/Fe3O4 nanostructures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We report on electrical and magnetic properties of polyaniline (PANI) nanotubes (â¼150 nm in diameter) and PANI/Fe3O4 nanowires (â¼140 nm in diameter) containing Fe3O4 nanoparticles with a typical size of 12 nm. These systems were prepared by a template-free method. The conductivity of the nanostructures is 10â1-10â2 S/cm; and the temperature dependent resistivity follows a ln Ïâ¼Tâ1/2 law. The composites (6 and 20 wt% of Fe3O4) show a large negative magnetoresistance compared with that of pure PANI nanotubes and a considerably lower saturated magnetization (Ms=3.45 emu/g at 300 K and 4.21 emu/g at 4 K) compared with the values measured from bulk magnetite (Ms=84 emu/g) and pure Fe3O4 nanoparticles (Ms=65 emu/g). AC magnetic susceptibility was also measured. It is found that the peak position of the AC susceptibility of the nanocomposites shifts to a higher temperature (>245 K) compared with that of pure Fe3O4 nanoparticles (190-200 K). These results suggest that interactions between the polymer matrix and nanoparticles take place in these nanocomposites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 370, Issues 1â4, 15 December 2005, Pages 121-130
Journal: Physica B: Condensed Matter - Volume 370, Issues 1â4, 15 December 2005, Pages 121-130
نویسندگان
Yunze Long, Zhaojia Chen, Jean Luc Duvail, Zhiming Zhang, Meixiang Wan,