紋理扶手椅石墨烯奈米帶的熱電特性

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姓名

許家輔(Chia-Fu Hsu) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

紋理扶手椅石墨烯奈米帶的熱電特性
(Thermoelectric Properties of Textured Armchair Graphene Nanoribbons)

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摘要(中)

熱電材料是一種具有特殊特性的材料，它們可以將熱能轉換成電能，或者將電能轉換成熱能。一個良好的熱電材料是呈現半導體特性，然而石墨烯卻是呈現金屬特性，於是我們利用Quantun Confinement的方式將石墨烯轉化為石墨烯奈米帶。由於有研究人員發現，把armchair graphene nanoribbons上方碳原子週期勢移除，能夠形成全新的結構，其獨特的結構可以降低聲子熱導率，同時提高席貝克係數和功率因子，進而提高熱電優值，此結構稱為textured armchair graphene nanoribbons。我們將評估不同參數組合下textured armchair graphene nanoribbons的功率因子和熱電優值。這項研究將有助於深入了解textured armchair graphene nanoribbons的熱電特性，並為開發高效能熱電材料和相關應用提供重要的指標。

摘要(英)

Thermoelectric materials belong to a class of unique materials capable of converting heat energy into electrical energy, or vice versa. An ideal thermoelectric material exhibits semiconductor properties, whereas graphene possesses metallic properties. To address this, we employ quantum confinement techniques to transform graphene into graphene nanoribbons. Researchers have made an intriguing discovery by eliminating the carbon atomic periodic potential above armchair graphene nanoribbons, resulting in the formation of a new structure. This distinctive structure effectively reduces the phonon thermal conductivity, while simultaneously increasing the Seebeck coefficient and power factor, thereby enhancing the thermoelectric figure of merit. This structure is referred to as "textured armchair graphene nanoribbons." In this study, we will assess the power factor and thermoelectric figure of merit of textured armchair graphene nanoribbons using various parameter combinations. The primary objective of this research is to provide valuable insights into the thermoelectric properties of textured armchair graphene nanoribbons, serving as a vital resource for the development of high-performance thermoelectric materials and their associated applications.

關鍵字(中)

★ 石墨烯奈米帶
★ 紋理扶手椅
★ 熱電特性
★ 量子侷限效應

關鍵字(英)

論文目次

摘要 I
Abstract II
目錄 III
圖目錄 V
第一章、導論 1
1-1前言 1
1-2 熱電效應 2
1-3 石墨稀 4
1-4 研究動機 5
第二章、系統模型 6
2-1 Graphene structure 6
2-2 石墨稀奈米帶 7
2-3 電子傳輸係數 8
2-4 熱電係數 10
2-5 局部態密度(Local Density of State(LDOS)) 12
第三章、熱電特性的模擬與分析 14
3-1 AGNR與t-AGNR在常溫之下的熱電特性 14
3-2改變armchair edge原子數Na對熱電特性的影響 15
3-3改變zigzag edge原子數Nz對熱電特性的影響 16
3-4 Tunneling rate對熱電特性的影響 17
3-5 溫度對熱電特性的影響 18
第四章、結論 20
參考文獻 21

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指導教授

郭明庭(Ming-Ting Kuo)

審核日期

2023-6-9

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