THE EFFECT OF SINGLE WALLED CARBON NANOTUBES ON THE THERMOELECTRIC PROPERTIES OF BISMUTH TELLURIDE

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

Modern new technologies, including carbon nanomaterials, polymers performed electronically, and their nanocomposites enhance the performance of thermoelectric materials. Thermoelectrical responses can be improved by simultaneously tuning different properties within the material, such as nano structuring, nanocomposites, and doping. The purpose of this work is to determine the effect of single walled carbon nanotubes (SWCNT) on the thermoelectric properties of an n-type bismuth telluride alloy. Mechanical alloying and compaction sintering techniques are used to prepare SWCNT/Bi2Te2.55Se0.45 composites. Experiments are conducted with different concentrations (0.01, 0.025, 0.1 and 0.5 weight percent) and duration times of 20 hours. The results of the thermoelectric characteristics of SWCNT indicates that ball milling technique influences both its structure and agglomeration. The CNT filler is added during the step of mechanical milling, as this preserves SWCNT structure and increases its electrical conductivity. Additionally, it is demonstrated that SWCNT milling technique improves the Seebeck coefficient. While an increase in thermal conductivity is expected as a result of the high electrical conductivity due to increased scattering at the new interfaces, a significant drop in the lattice thermal conductivity is attained. The figure-of-merit for the optimal sample with 0.1 percent SWCNT added in 20 milling hours has improved by 13% at room temperature indicating a value of 0.3, and by 32% at 156.9°C indicating the highest ZT value of 0.6.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0c65103d-64b2-49b6-b86d-dfca3ed7ab54

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

798326_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Khaled Youssef","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Mohamed Alameldin Ali Mohamed","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

THE EFFECT OF SINGLE WALLED CARBON NANOTUBES ON THE THERMOELECTRIC PROPERTIES OF BISMUTH TELLURIDE

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

carbon nanomaterials Bismuth Telluride single walled carbon nanotubes (SWCNT)

إشراف وإعداد

الإشراف

Khaled Youssef

الإعداد

Mohamed Alameldin Ali Mohamed

الاقتباسات الببليوغرافية