Strategies to form hierarchical heteronanostructures : Heteroepitaxy and nanoalloy formation
- 주제(키워드) nanochemistry , hierarchical , hetero-nanostructure
- 발행기관 고려대학교 대학원
- 지도교수 이광렬
- 발행년도 2015
- 학위수여년월 2015. 2
- 학위구분 석사
- 학과 일반대학원 화학과
- 세부전공 무기화학
- 원문페이지 83 p
- 실제URI http://www.dcollection.net/handler/korea/000000057220
- 본문언어 영어
- 제출원본 000045828273
초록/요약
Hierarchical branched nanostructures, most examples are found for oxide nanomaterial, have received a great attention due to their potential application in sensors, solar cells, optoelectronic devices, and etc. Although hierarchical branched nanostructures possess advantages including structural hierarchy and high surface areas, there are no known examples of all metal hierarchical nanostructures due to the difficulty in nucleation of heterophase on the single crystalline metal phase. With our recently reported coaxial Au@Pt nanowires, I attempted the growth of Rh phase because there are numerous twinning boundaries providing the ideal Rh growth sites. In this thesis, I have successfully demonstrated the dimension controlled vertical growth of Rh nanorods and nanoplates on a Au@Pt nanowire, which are not obtained in the absence of the Au@Pt nanowire substrate. These hierarchical Rh nanocrystals on Au@Pt nanowires are expected to provide an ideal condition for maximal catalyst utilization due to the completely exposed active catalytic surface and easily accessible structure by the organic substrates.
more목차
ABSTRACT Ⅰ
TABLE OF CONTENTS Ⅲ
LIST OF FIGURES Ⅴ
LIST OF CHEMICAL REAGENTS Ⅹ
LIST OF EQUIPMENTS Ⅺ
1. INTRODUCTION 1
1.1. Hetero-nanostructure 1
1.1.1 Core-shell structure 1
1.1.2 Nanoalloy 6
1.1.3 Hetero dimer 9
1.1.4 Hierarchical structure 11
1.2. Synthetic strategies 14
1.2.1. Impurity doping 15
1.2.2. Epitaxial growth 17
1.2.3. High energy surface stabilization 21
1.2.4. Etching 26
1.3. Research object 31
1.4. References 32
2. EXPERIMENTAL PROCEDURE 37
2.1. Synthesis of hierarchical Rh nanocrystals on Au@Pt nanowire 37
2.2. Experimental section 40
3. RESULT AND DISCUSSION 42
4. CONCLUSION 65
5. REFERENCES 66
