ridm@nrct.go.th   ระบบคลังข้อมูลงานวิจัยไทย   รายการโปรดที่คุณเลือกไว้

Interface driven energy filtering of thermoelectric power in spark plasma sintered Bi2Te2.7Se0.3 nanoplatelet composites

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Interface driven energy filtering of thermoelectric power in spark plasma sintered Bi2Te2.7Se0.3 nanoplatelet composites
นักวิจัย : Soni, Ajay , Shen, Yiqiang , Yin, Ming , Zhao, Yanyuan , Yu, Ligen , Hu, Xiao , Dong, Zhili , Khor, Khiam Aik , Dresselhaus, Mildred S. , Xiong, Qihua
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Soni, A., Shen, Y., Yin, M., Zhao, Y., Yu, L., Hu, X., et al. (2012). Interface Driven Energy Filtering of Thermoelectric Power in Spark Plasma Sintered Bi2Te2.7Se0.3 Nanoplatelet Composites. Nano Letters, 12(8), 4305-4310. , 1530-6984 , http://hdl.handle.net/10220/10697 , http://dx.doi.org/10.1021/nl302017w
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Nano letters
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Control of competing parameters such as thermoelectric (TE) power and electrical and thermal conductivities is essential for the high performance of thermoelectric materials. Bulk-nanocomposite materials have shown a promising improvement in the TE performance due to poor thermal conductivity and charge carrier filtering by interfaces and grain boundaries. Consequently, it has become pressingly important to understand the formation mechanisms, stability of interfaces and grain boundaries along with subsequent effects on the physical properties. We report here the effects of the thermodynamic environment during spark plasma sintering (SPS) on the TE performance of bulk-nanocomposites of chemically synthesized Bi2Te2.7Se0.3 nanoplatelets. Four pellets of nanoplatelets powder synthesized in the same batch have been made by SPS at different temperatures of 230, 250, 280, and 350 °C. The X-ray diffraction, transmission electron microscopy, thermoelectric, and thermal transport measurements illustrate that the pellet sintered at 250 °C shows a minimum grain growth and an optimal number of interfaces for efficient TE figure of merit, ZT0.55. For the high temperature (350 °C) pelletized nanoplatelet composites, the concurrent rise in electrical and thermal conductivities with a deleterious decrease in thermoelectric power have been observed, which results because of the grain growth and rearrangements of the interfaces and grain boundaries. Cross section electron microscopy investigations indeed show significant grain growth. Our study highlights an optimized temperature range for the pelletization of the nanoplatelet composites for TE applications. The results provide a subtle understanding of the grain growth mechanism and the filtering of low energy electrons and phonons with thermoelectric interfaces.

บรรณานุกรม :
Soni, Ajay , Shen, Yiqiang , Yin, Ming , Zhao, Yanyuan , Yu, Ligen , Hu, Xiao , Dong, Zhili , Khor, Khiam Aik , Dresselhaus, Mildred S. , Xiong, Qihua . (2555). Interface driven energy filtering of thermoelectric power in spark plasma sintered Bi2Te2.7Se0.3 nanoplatelet composites.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Soni, Ajay , Shen, Yiqiang , Yin, Ming , Zhao, Yanyuan , Yu, Ligen , Hu, Xiao , Dong, Zhili , Khor, Khiam Aik , Dresselhaus, Mildred S. , Xiong, Qihua . 2555. "Interface driven energy filtering of thermoelectric power in spark plasma sintered Bi2Te2.7Se0.3 nanoplatelet composites".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Soni, Ajay , Shen, Yiqiang , Yin, Ming , Zhao, Yanyuan , Yu, Ligen , Hu, Xiao , Dong, Zhili , Khor, Khiam Aik , Dresselhaus, Mildred S. , Xiong, Qihua . "Interface driven energy filtering of thermoelectric power in spark plasma sintered Bi2Te2.7Se0.3 nanoplatelet composites."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Soni, Ajay , Shen, Yiqiang , Yin, Ming , Zhao, Yanyuan , Yu, Ligen , Hu, Xiao , Dong, Zhili , Khor, Khiam Aik , Dresselhaus, Mildred S. , Xiong, Qihua . Interface driven energy filtering of thermoelectric power in spark plasma sintered Bi2Te2.7Se0.3 nanoplatelet composites. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.