1차원 나노구조의 표면변화에 따른 특성과 응용 연구

Title
1차원 나노구조의 표면변화에 따른 특성과 응용 연구
Authors
양주찬
Keywords
1차원나노구조의표면변화에따른특성과응용연구
Issue Date
2011
Publisher
인하대학교
Abstract
(1) Annealing effects on the structure, photoluminescence, and magnetic properties of GaN/Mn3O4 core–shell nanowires Nanowires consisting of GaN/Mn3O4 were prepared using a two-step approach that involved dipping the as-synthesized GaN nanowires into an aqueous manganese acetate solution. To examine the effects of annealing, GaN/Mn3O4 core–shell nanowires were heated thermally to 700 ℃ in N2 ambient. Transmission electron microscopy showed that the continuous Mn3O4 shell layer had agglomerated to expose a bare GaN core surface after thermal annealing. The magnetic measurements showed that the ferromagnetic behavior of the GaN nanowires had been suppressed by coating with the Mn3O4 shell, without significant change by the subsequent thermal annealing. The GaN/Mn3O4 core–shell nanowires exhibited blue, green, and red photoluminescence (PL) emission. The red emission was enhanced by thermal annealing. This paper discusses the associated mechanism for the variations in PL and magnetic properties of GaN/Mn3O4 core–shell nanowires. (2) Significant enhancement of sensing characteristics in In2O3 nanowires by functionalizing with Pt nanoparticles We report a significant enhancement in the gas sensing properties of In2O3 nanowires by functionalizing their surfaces with Pt nanoparticles. For Pt-functionalization, In2O3-Pt core-shell nanowires are synthesized by the sputtering deposition of Pt layers on bare In2O3 nanowires. Next, continuous Pt shell layers are transformed into Pt nanoparticles of cubic phase by heat treatment. In an O2 gas sensing test, the Pt-functionalized In2O3 nanowires reveal exceptionally higher sensitivity and faster response than bare In2O3 nanowires.
Description
Ⅰ. 서 론 1 Ⅱ. 이론적 배경 3 1. 왜 나노 물질인가 3 1-1. 나노물질의 종류 3 1-2. 1차원 나노구조의 특성 3 1-3. 1차원 나노구조의 표면적 효과 3 1-4. 양자 크기 효과 (quantum size effect) 5 2. 1차원 나노구조의 특징 7 2-1. 열적 안정성 7 2-2.기계적 특성 7 2-3. 전기적 특성 8 2-4. 광학적 특성 8 2-5. Sensors 응용 9 3. Bottom - up: 나노기술의 핵심 11 3-1. 단일벽 탄소 나노 튜브 12 3-2. 반도체 나노와이어 13 4. 1차원 나노구조의 합성 13 4-1. 기체-고체 합성법 (vapor-solid method) 14 4-2. 기체-액체-고체 합성법 (vapor-liquid-solid method) 16 4-3. 고체-액체-고체 합성법 (solid-liquid-solid method) 17 4-4. 용액-액체-고체 반응법 (solution-liquid-solid method) 17 4-5. Solvothermal Methods 18 5. 참고문헌 19 Ⅲ. GaN/Mn3O4 coreshell nanowires 의 열처리에 따른 표면 구조변화와 Photoluminescence , Magnetic properties 의 변화 22 1. 개요 22 2. 실험 방법 23 3. 결과 및 고찰 23 4. 결론 31 5. 참고문헌 32 Ⅳ. Pt nanoparticles 를 이용한 In2O3 nanowires 의 표면변화에 따른 센싱 특성의 강화 34 1. 개요 34 2. 실험 방법 36 3. 결과 및 고찰 37 4. 결론 46 5. 참고문헌 47 Ⅵ. 총 결 론 49
URI
http://dspace.inha.ac.kr/handle/10505/22414
Appears in Collections:
College of Engineering(공과대학) > Materials Science & Engineering (신소재공학) > Theses(신소재공학 석박사 학위논문)
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