کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1666904 1518076 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhancement of electron emission and long-term stability of tip-type carbon nanotube field emitters via lithium coating
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Enhancement of electron emission and long-term stability of tip-type carbon nanotube field emitters via lithium coating
چکیده انگلیسی

Carbon nanotubes (CNTs) were deposited on conical tip-type substrates via electrophoresis and coated with lithium (Li) thin films with diverse thicknesses via electroplating. For the as-deposited (i.e., without Li coating) CNT, the turn-on (or triggering) electric field was 0.92 V/μm, and the emission current, which was generated at an applied field of 1.2 V/μm was 56 μA. In the case of the 4.7 nm-thick Li-coated CNT, the turn-on field decreased to 0.65 V/μm and the emission current at the same applied field increased more than ten times to 618 μA. The analysis based on the Kelvin probe measurement and Fowler–Nordheim theory indicated that the coating of Li caused a loss in the structural-aspect-ratio of the CNTs and it reduced their effective work functions from 5.36 eV to 4.90 eV, which led to a great improvement of their electron emission characteristics. The results obtained in this study also showed that the long-term emission stability could be enhanced by the coating of thin Li films on CNTs.


► CNTs are deposited via electrophoretic deposition (EPD).
► Thin films of Li are coated on CNTs via electroplating, without plasma damage.
► Li coating enhanced field emission properties and emission stability of CNTs.
► The effective work functions and field enhancement factors of CNTs are evaluated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 528, 15 January 2013, Pages 242–246
نویسندگان
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