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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 謝宗霖(Jay Shieh) | |
dc.contributor.author | Yi-Sheng Lin | en |
dc.contributor.author | 林易生 | zh_TW |
dc.date.accessioned | 2021-06-16T05:39:31Z | - |
dc.date.available | 2017-09-04 | |
dc.date.copyright | 2014-09-04 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-08-12 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/56642 | - |
dc.description.abstract | 本文探討鈣鈦礦氧化物薄膜AgNbO3、SrTiO¬¬3及其固溶體(SrTiO3)x(AgNbO3)1-x (x =0.25、0.5、0.75) 作為異相反應光觸媒(heterogeneous photocatalyst),應用於水分解(water splitting)產氫之表現,所使用的製程為溶膠-凝膠法(sol-gel process)以及旋轉塗布法(spin-coating method),並透過三極式電化學裝置所量測之光電流值來觀察水分解效率。
本研究著眼於(SrTiO3)x(AgNbO3)1-x薄膜在不同固溶比例下,其能帶結構的變化,並利用此變化為基礎進行不同的光電極設計,有效提升水分解效率。實驗結果顯示,固溶體薄膜之能隙值介於AgNbO3 (Eg = 2.8 eV)及SrTiO3 (Eg = 3.28 eV)兩純薄膜之間,且其吸收光譜(UV-Vis spectroscopy)隨著x值的增加呈現藍移的趨勢;另一方面,透過紫外光電子能譜儀(ultraviolet photoelectron spectroscopy)的觀測,此一系列固溶體薄膜之費米能階(Fermi level)與價帶頂端(the top of valence band)之電位差值,亦會隨x值的增加而有減少的變化。 鑑於固溶比例可調控能帶結構此一特點,本研究進一步利用此結果,將不同成分的(SrTiO3)x(AgNbO3)1-x薄膜進行層狀堆疊,觀察異質接面(heterojunction)對光電流表現的影響。重大實驗結果有二:其一,SrTiO3/AgNbO3層狀結構(將SrTiO3堆疊於AgNbO3之上)的光電流密度優於單一成份的SrTiO3與AgNbO3薄膜;其二,SrTiO3/(SrTiO3)0.75(AgNbO3)0.25/AgNbO3與SrTiO3/(SrTiO3)0.5(AgNbO3)0.5/AgNbO3之光電流密度較SrTiO3/AgNbO3更為出色。此二成果指引設計優秀光觸媒材料所需之可行取徑:首先,異質接面所形成的內建電場,可幫助光致激發電子電洞對快速分離,降低再複合的機率;再者,將不同能隙值材料由寬至窄能隙做循序漸進之堆疊,將能有效利用光能,提升光致載子進行水分解反應的可能;最後,利用固溶體晶體結構的過渡性以及能帶結構的可調控性,將能作為純物質結構(SrTiO3/AgNbO3)之匹配層,優化層狀結構的品質,降低光致載子受阻之機率。 | zh_TW |
dc.description.abstract | In this study, we chose perovskite oxide thin films — (SrTiO3)x(AgNbO3)1-x (x = 0; 0.25; 0.5; 0.75; 1) to discuss the application of heterogeneous photocatalyst in the field of water splitting for hydrogen harvesting. The sol-gel method and spin-coating process were used to synthesize the thin films, and “photocurrent density” was measured by a three-electrode electrochemical cell to observe the efficiency of water splitting.
The first part of the thesis was focused on the band structure evolution of (SrTiO3)x(AgNbO3)1-x. It was found that the band-gap energy of the solid solution was between AgNbO3 and SrTiO3, and exhibited average blue shift with the increase of the value x. Furthermore, by means of UPS analysis, the difference in potential between Fermi level and the top of valence band would decrease with the x value enhancement. Secondly, we investigated the effect of “heterojunction” on photocurrent responses through multiple layered-structure arrangements. There were two essential results: first of all, the photocurrent density of SrTiO3/AgNbO3 was superior to the pure components; second, SrTiO3/(SrTiO3)x(AgNbO3)1-x/AgNbO3 (x = 0.75, 0.5) performed higher photocurrent density than SrTiO3/AgNbO3. The results demonstrated several ideas of photoelectrode design for the course of outstanding photocurrent performance: initially, the “build-in electrical field” formed at the interface of different components is able to restrain recombination of photo-induced carriers; further, stacking materials of different band-gap energy can enhance light absorbance; last but not least, solid solution can be an intermediate matching layer to improve interface quality, which has consequential influence on conductivity of photo-induced carriers. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T05:39:31Z (GMT). No. of bitstreams: 1 ntu-103-R01527025-1.pdf: 9928352 bytes, checksum: 41d901432fe096438d12b854d4d90e10 (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | 目錄
致謝....................................................................................................................................I 摘要...................................................................................................................................II Abstract............................................................................................................................III 目錄................................................................................................................................IV 圖目錄............................................................................................................................VII 表目錄.........................................................................................................................XIII 第一章 緒論.....................................................................................................................1 1.1 研究背景與動機................................................................................................1 1.2 論文架構............................................................................................................2 第二章 文獻回顧.............................................................................................................3 2.1 光解水原理........................................................................................................3 2.2 光電化學電池(Photoelectrochemical cell,PEC) ............................................7 2.2.1 半導體與電解液界面...............................................................................7 2.2.2 PEC裝置的改良...................................................................................13 2.3 提升光觸媒材料光催化分解水之方法..........................................................17 2.3.1固溶體......................................................................................................19 2.3.2異質接面..................................................................................................20 2.4 光觸媒材料......................................................................................................24 2.4.1 SrTiO3.......................................................................................................25 2.4.2 AgNbO3....................................................................................................29 2.4.3 (SrTiO3)x(AgNbO3)1-x..............................................................................32 2.5 溶膠-凝膠法.....................................................................................................35 第三章 實驗方法...........................................................................................................39 3.1 SrTiO3、AgNbO3及(SrTiO3)x(AgNbO3)1-x溶膠配製流程.............................41 3.1.1 SrTiO3溶膠配製.......................................................................................41 3.1.2 AgNbO3溶膠配製....................................................................................42 3.1.3 (SrTiO3)x(AgNbO3)1-x溶膠配製..............................................................43 3.2薄膜製備............................................................................................................45 3.2.1 基材之清洗.............................................................................................45 3.2.2 SrTiO3薄膜之製備...................................................................................45 3.2.3 AgNbO3薄膜之製備................................................................................45 3.2.4 (SrTiO3)x(AgNbO3)1-x薄膜之製備..........................................................47 3.2.5 層狀結構之製備.....................................................................................48 3.3材料分析............................................................................................................51 3.3.1 結晶相鑑定.............................................................................................51 3.3.2 微結構分析.............................................................................................51 3.3.3 X光電子能譜分析..................................................................................52 3.3.4 紫外光/可見光光譜分析........................................................................52 3.3.5 紫外光電子能譜分析.............................................................................52 3.3.6 光電流密度之量測.................................................................................53 第四章 結果與討論.......................................................................................................55 4.1 SrTiO3、AgNbO3及(SrTiO3)x(AgNbO3)1-x薄膜...............................................56 4.1.1 結晶相鑑定.............................................................................................56 4.1.2 微結構分析.............................................................................................60 4.1.3 紫外光/可見光吸收反射光譜分析........................................................64 4.1.4 表面化學元素定量分析.........................................................................67 4.1.5 紫外光電子能譜分析.............................................................................71 4.1.6 光電流密度之量測.................................................................................74 4.2 SrTiO3/AgNbO3層狀結構................................................................................79 4.2.1 結晶相鑑定.............................................................................................79 4.2.2 微結構分析.............................................................................................81 4.2.3 能帶結構.................................................................................................82 4.2.4 光電流密度量測.....................................................................................83 4.3 SrTiO3/(SrTiO3)x(AgNbO3)1-x/AgNbO3層狀結構............................................85 4.3.1 微結構分析.............................................................................................86 4.3.2 結晶相鑑定.............................................................................................91 4.3.3 能帶結構.................................................................................................93 4.3.4 光電流密度量測.....................................................................................95 4.4 綜合討論..........................................................................................................97 第五章 結論.................................................................................................................100 5.1 研究成果........................................................................................................100 5.2 未來研究方向................................................................................................102 參考文獻.......................................................................................................................103 | |
dc.language.iso | zh-TW | |
dc.title | 鈦酸鍶-鈮酸銀固溶體層狀薄膜結構之光吸收與光電流表現 | zh_TW |
dc.title | The Optical Absorption and Photocurrent Response of Layered Structures Based on SrTiO3-AgNbO3 Solid Solution Thin Films | en |
dc.type | Thesis | |
dc.date.schoolyear | 102-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 段維新(Wei-Hsing Tuan),薛景中(Jing-Jong Shyue),郭俞麟(Yu-Lin Kuo) | |
dc.subject.keyword | SrTiO3,AgNbO3,(SrTiO3)x(AgNbO3)1-x,水分解,光電流,異質接面, | zh_TW |
dc.subject.keyword | SrTiO3,AgNbO3,(SrTiO3)x(AgNbO3)1-x,water splitting,photocurrent,heterojunction, | en |
dc.relation.page | 112 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2014-08-12 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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