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A-site modification effect of 2-dimensional dielectric nanosheets : A-site 치환에 따른 2차원 유전체 나노시트의 특성 분석

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dc.contributor.advisor성영은-
dc.contributor.author임해나-
dc.date.accessioned2018-11-12T00:53:57Z-
dc.date.available2018-11-12T00:53:57Z-
dc.date.issued2018-08-
dc.identifier.other000000152474-
dc.identifier.urihttps://hdl.handle.net/10371/143004-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 공과대학 화학생물공학부(에너지환경 화학융합기술전공), 2018. 8. 성영은.-
dc.description.abstractThe demand for high-k dielectric thin films have been continuously increasing to satisfy the requirement of next-generation electronic devices such as ultra-thin dielectric layer in high capacitance multilayer ceramic capacitors and gate dielectric for high mobility thin film transistor. In addition, as these devices are becoming highly integtraed, the thickness of dielectric layer should be reduced under tens of nanometers. The well-known dielectric films for capacitors are BaTiO3 based perovskites. However, these materials usually decrease their dielectric permittivity as thickness reduces because of the size-effect-
dc.description.tableofcontentsContents



Abstract .......................................................................................................ⅰ

Contents ......................................................................................................ⅳ

List of Tables ...............................................................................................ⅷ

List of Figure .............................................................................................ⅸ



Chapter 1. Introduction .............................................................1

1.1. General introduction to dielectrics ..................................................1

1.2. 2-Dimensional dielectric nanosheets ................................................4

1.3. Langmuir-Blodgett method ............................................................10

1.4. Main work of this study ..................................................................12

1.5. References .....................................................................................14



Chapter 2. Synthesis and characterization of Sr-substituted KCa2Nb3O10 ceramics and nanosheets …......................................................................16

2.1. Introduction ....................................................................16

2.2. Experimental section ......................................................18

2.2.1. Synthesis of KCa2(1-x)Sr2xNb3O10 ceramics .........................18

2.2.2. Structural and dielectric properties measurements of ceramics .........................................................................................18

2.2.3. Synthesis of Ca0.8Sr1.2Nb3O10 nanosheets .............................19

2.3. Results and discussion ....................................................20

2.3.1. Syntheses and structural characterization of KCa2(1-x)Sr2xNb3 O10 and HCa2(1-x)Sr2xNb3O10 ceramics ............................................20

2.3.2. Dielectric characterization of KCa2(1-x)Sr2xNb3O10 and HCa2(1-x)Sr2xNb3O10 ceramics ....................................................................27

2.3.3. Dielectric characterization of Ca0.8Sr1.2Nb3O10 nanosheets thin films ...............................................................................................33

2.4. Conclusions ....................................................................38

2.5. References ......................................................................39



Chapter 3. Synthesis and characterization of Bi-substituted Sr2Nb3O10 nanosheets ……….......................................................................................41

3.1. Introduction ....................................................................41

3.2. Experimental section ......................................................44

3.2.1. Synthesis of KSr2(1-x)Bi2xNb3O10 ceramics .........................44

3.2.2. Structural and dielectric properties measurements ..............44

3.2.3. Synthesis of Sr1.8Bi0.2Nb3O10 nanosheets ............................45

3.3. Results and discussion ....................................................47

3.3.1. Syntheses and structural characterization of KSr2(1-x)Bi2xNb3 O10 and HSr2(1-x)Bi2xNb3O10 ceramics ............................................47

3.3.2. Dielectric characterization of KSr2(1-x)Bi2xNb3O10..............51

3.3.3. Dielectric characterization of HSr2(1-x)Bi2xNb3O10..............58

3.3.4. Synthesis of Sr1.8Bi0.2Nb3O10 nanosheets ............................63

3.4. Conclusions ....................................................................67

3.5. References ......................................................................68



Chapter 4. Synthesis and characterization of Ag-substituted Sr2Nb3O10 nanosheets .............................................................................70

4.1. Introduction ....................................................................70

4.2. Experimental section ......................................................72

4.2.1. Synthesis of KSr2(1-x)Ag2xNb3O10 ceramics .........................72

4.2.2. Structural and dielectric properties measurements ..............72

4.2.3. Synthesis of Sr1.8Ag0.2Nb3O10 nanosheets ...........................73

4.3. Results and discussion ....................................................74

4.3.1. Syntheses and structural characterization of KSr2(1-x)Ag2xNb3 O10 ceramics ...................................................................................74

4.3.2. Dielectric characterization of KSr2(1-x)Ag2xNb3O10 ...............77

4.3.3. Dielectric characterization of HSr2(1-x)Ag2xNb3O10 ...............80

4.3.4. Synthesis of Sr1.8Ag0.2Nb3O10 nanosheets ............................85

4.4. Conclusions ....................................................................88

4.5. References ......................................................................89



Chapter 5. Fabrication and characterization of multilayer nanosheets thin film .......................................................................................................90

5.1. Introduction ....................................................................90

5.2. Experimental section ......................................................92

5.2.1. Deposition nanosheets thin films by Langmuir-blodgett method ...........................................................................................92

5.2.2. Structural and dielectric properties measurements ..............92

5.3. Results and discussion ....................................................94

5.3.1. Characterization of Sr1.8Bi0.2Nb3O10 nanosheets ..................94

5.3.2. Characterization of Sr1.8Bi0.2Nb3O10 multilayer thin film .................................................................................................98

5.3.2. Fabrication transparent dielectric capacitor ........................105

5.4. Conclusions ...................................................................107

5.5. References .....................................................................108



국문 초록 (Abstract in Korean) ..........................................110
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dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subject.ddc660.6-
dc.titleA-site modification effect of 2-dimensional dielectric nanosheets-
dc.title.alternativeA-site 치환에 따른 2차원 유전체 나노시트의 특성 분석-
dc.typeThesis-
dc.contributor.AlternativeAuthorHaena Yim-
dc.description.degreeDoctor-
dc.contributor.affiliation공과대학 화학생물공학부(에너지환경 화학융합기술전공)-
dc.date.awarded2018-08-
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