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Abstract: In this work, we have prepared titanium-doped vanadium dioxide (Ti-VO2) particles having a low phase transition temperature.
Ti-VO2 particles were synthesized by sol-gel method using vanadyl (IV) sulfate and ammonium hydrogen bicarbonate as precursors. The structure and thermochromic property of synthesized Ti-VO2 particles were investigated by FE-SEM, XRD, DSC, and UV-vis-NIR analysis. The prepared Ti-VO2 showed a nearly platy morphology, which indicates that the titanium was successfully doped in the crystal lattices of VO2.
Ti-VO2 nanoparticles with the size of 100 nm exhibited a monoclinic crystal structure, and their chemical composition and surface state were also likely to be close to that of VO2.
In addition, DSC analyses displayed that the critical phase transition temperature of VO2 particles could be reduced by increasing the doped Ti fraction. UV–vis–NIR spectra showed that the Ti- VO2 particles-embedded coating has good thermochromic performance.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/25600
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001966675

Table Of Contents: 목 차

목 차 ⅰ
List of Tables ⅲ
List of Figures ⅳ
Abstract ⅵ

제１장서론 1

제２장이론 3
2.1. Sol-Gel method 5
2.1.1. Sol-Gel method의 원리 3
2.1.2. 가수분해 및 축합반응에 의한 sol-gel 공정 7
2.2 수열합성 방법 12
2.3. 코팅 방법 15
2.3.1. Spin coating 법 15
2.4 Vanadium - Oxygen System 17
2.4.1. 열역학적 고찰 17
2.4.2. 결정상 19
2.4.3. Vanadium – Oxygen System 19
2.4.4. VO2 (Vanadium Dioxide)의 상전이 현상 23

제３장실험 31
3.1. 시 약 31
3.2 합 성 31
3.2.1. 코팅 방법 34
3.3 샘플 특성 분석 36
3.3.1. XRD 분석 36
3.3.2. FE-SEM 분석 36
3.3.3. DSC 분석 36
3.3.4 UV-vis–NIR 분석 37

제 ４ 장 결과 및 고찰 38
4.1 Ti-VO2 입자의 특성 분석 38
4.1.1. Ti 함유량 에 따른 VO2 결정성 38
4.1.2. 적외선 투과도 에 의한 열변색 특성 42
4.2 상전이 온도 및 가역 상전이 온도 분석 44
4.3 입자의 미세 구조 및 형태 47

제 ５ 장 결 론 49

참고문헌 50

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