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研究生:鍾昌浩
研究生(外文):Chang-Hao Zhong
論文名稱:利用聚苯乙烯微球模板與電沉積來製備三維結構碲化鉍熱電材料之研究
論文名稱(外文):Preparation of 3-dimension Bismuth Telluride Thermoelectrical Material by Electrodeposition and Polystyrene Sphere Template
指導教授:林昭任林昭任引用關係
指導教授(外文):Tsao-Jen Lin
口試委員:廖建能林昭任王朝弘
口試委員(外文):Chien-Neng LiaoTsao-Jen LinChao-Hong Wang
口試日期:2011-07-25
學位類別:碩士
校院名稱:國立中正大學
系所名稱:化學工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2011
畢業學年度:99
語文別:中文
論文頁數:107
中文關鍵詞:熱電
外文關鍵詞:thermoelectrical
相關次數:
  • 被引用被引用:1
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本研究為製備具有三維結構的碲化鉍(BixTey)熱電材料。首先利用聚苯乙烯微球(polystyrene sphere, PS)進行電泳沉積在ITO基板做為模板,並電沉積BixTey於PS微球模板內形成具三維結構的BixTey,藉以探討此結構下的熱電性質之研究。為了改善功率因子(Power factor, S2/ρ)可用以下三種方法來操作:(1)調整沉積電位 (-5mV~-400mV)來改變碲於薄膜含量;(2)使用不同PS微球粒徑(100nm~700nm)來調整PS球模板內孔洞大小並改變BixTey三維結構;(3)添加金屬奈米粒子改善薄膜電阻率(ρ)。結果顯示,在400nm-PS的模板下沉積電位為E= -8mV,因化學計量數較符合Bi2Te3且結晶性較佳可得最高Power factor值為172.55µW/m-K2 ,其中西貝克係數值(Seebeck coefficient, S)為-58.185µV/K與ρ為1.962mΩ-cm。另外沉積電位的提升能使薄膜內的Te含量增加,導致載子濃度也隨之增加,然而載子濃度的增加卻使得S增加,此與一般文獻結果相反,推測可能是Te含量的添加使得載子有效質量與載子濃度皆上升,但因載子有效質量影響遠大於載子濃度而使S得以提升。此外利用不同PS模板粒徑的縮小所沉積出三維BixTey薄膜結構較為連續使得ρ也隨之降低。另外,薄膜中含浸Ag奈米粒子提升薄膜內自由電子傳遞的能力在相同E=-50mV下ρ降低至1.674mΩ-cm,而Power factor則提高到106.29 µW/m•K2。
This study was to investigate the preparation of a three-dimensional (3-D) thermoelectrical material of bismuth telluride (BixTey) by electrodepositing bismuth telluride in a 3-D polystyrene (PS) template. The 3-D PS template was made of electrophoretic depositing PS sphere on the ITO glass substrate. Several thermoelectrical properties were investigated including Seebeck coefficient (S), Hall carrier concentration, and Hall carrier mobility. Three methods have been employed to enhance the power factor (S2/ρ): (1) changing the depositing potentials (-5mV~ -400mV) to adjust the Te content; (2) changing the pore size of the 3-D PS template to regulate the structural thickness of BixTey and the grain size of BixTey; (3) impregnating metallic nanoparticle to decrease the resistivity of the BixTey thin film. Because of its stoichiometry close to Bi2Te3 and with high crystalline, the BixTey film prepared in the 400nm-PS template at E= - 8mV can reach the maximum power factor of 172.55µW/m-K2 with S= -58.185 µV/K and ρ= 1.962mΩ-cm. As increasing the applied potential, it showed that both the content of Te and the carrier concentration were increased. However, S increased with the carrier concentration, which result was different from other theories. It could be attributed to that although both the effective mass of carriers and carrier concentration were increased with the content of Te, the effective mass of carriers has a larger enhanced by the content of Te. However, this enhanced effective mass of carriers has a positive effect on S. The BixTey film prepared in the 100nm-PS template has the minimum ρ at 0.791mΩ-cm, because it had smaller nanopore with a compact structure. Due to enhancing the transfer of electrons, the impregnated metallic-nanoparticle BixTey film has ρ= 1.674mΩ-cm and the power factor= 106.29µW/m•K2.
目錄
中文摘要 Ⅰ
AbstractⅡ
目錄 Ⅳ
圖目錄 Ⅷ
表目錄 XII
第一章 緒論 1
1.1 熱電緣起與目的 1
1.2 文章內容 3
第二章 文獻回顧 4
2.1 熱電材料 4
2.1.1 引言 4
2.1.2 熱電現象和效應 4
2.1.3 熱電優值 6
2.1.4 熱電材料Bi2Te3 8
2.1.5 製備碲化鉍方式 11
2.2模板介紹 25
2.2.1奈米材料的製作 25
2.2.2高分子PS與SiO2模板 26
2.3自組裝法 28
2.4聚苯乙烯奈米粒子 30
2.4.1聚苯乙烯膠體粒子的合成簡介 30
2.4.2乳化聚合法 30
2.4.3懸浮聚合法 34
2.4.4分散聚合法 35
2.5含浸法 35
2.6金屬鹽類還原奈米粒子 36
2.7研究動機與目的 37
第三章 實驗方法與步驟 38
3.1實驗藥品 38
3.2實驗儀器 39
3.3實驗流程 40
3.3.1實驗架構 40
3.3.2分析儀器及原理 41
3.3.3基材清洗 45
3.3.4聚合單一分佈PS球 47
3.3.5電泳披覆PS模板 51
3.3.6電鍍液配製 53
3.3.7碲化鉍電鍍 53
3.3.8移除PS球模板 55
3.4金屬鹽類還原金屬銀奈米粒子 56
第四章 結果與討論 58
4.1電泳薄膜厚度與時間關係 58
4.2 FT-IR分析 61
4.3乳化聚合聚苯乙烯微球之粒徑分析 63
4.4沉積電位選定 69
4.5三維碲化鉍結構形貌分析 71
4.6碲化鉍之XRD分析 74
4.7組成分析 77
4.8電性值量測 79
4.8.1相同粒徑下沉積電位對電性的影響 79
4.8.2相同粒徑下碲化鉍組成對電性的影響 83
4.8.3不同粒徑下碲化鉍結構對電性影響 89
4.8.4碲化鉍薄膜含浸金屬銀奈米粒子對電性的影響 95
第五章 結論與未來展望 100
5.1結論 100
5.1未來展望 101
參考文獻 102

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