کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
656692 1458047 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Laser flash Raman spectroscopy method for characterizing thermal diffusivity of supported 2D nanomaterials
ترجمه فارسی عنوان
روش طیف سنجی رامان فلاش لیزری برای تشخیص انتشار حرارتی نانومواد دوبعدی پشتیبانی شده
کلمات کلیدی
خصوصیات حرارتی؛ نفوذ پذیری حرارتی؛ روش طیف سنجی رامان فلاش لیزری؛ مواد 2D پشتیبانی شده؛ گرافن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• Nanosecond square pulsed laser is used to heat supported 2D material.
• Raman shifts are used to measure the temperatures of 2D material and substrate.
• Thermal diffusivity can be measured without knowing laser absorption.

2D nanomaterials have been attracting extensive research interests due to their superior properties and the accurate thermophysical characterization of 2D materials is very important for nanoscience and nanotechnology. This paper presents a transient “laser flash Raman spectroscopy” method for measuring the thermal diffusivity of 2D nanomaterials in the supported form without knowing the laser absorption coefficient. Square pulsed laser rather than continuous laser is used to heat the sample and the accumulated Raman signals are used to determine the time-averaged temperature rise of both the supported 2D material and the substrate. The laser absorption coefficient can be eliminated by comparing the temperature rises measured with different laser spot sizes and laser pulse durations. The method sensitivity is also analyzed by case studies for typical 2D nanomaterials. This method is useful for measuring the thermophysical properties of 2D materials in the most applicable forms and figuring out the difference between the supported and free-standing 2D material.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 95, April 2016, Pages 956–963
نویسندگان
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