论文总字数：18968字

摘 要

二氧化钒（VO₂）材料具有高温时阻挡红外光，透过可见光，低温时红外光及可见光均可透过的性能，在温控领域有着较好的应用市场。

本文把硫酸氧钒（VOSO₄）和钨酸铵（(NH₄)₁₀W₁₂O₄₁•5H₂O）作为钒源和掺杂剂，水合肼（N₂H₄）作为还原剂，通过水热法最终合成了掺钨二氧化钒（W_xV_1-xO₂）。将制备得到的W_xV_1-xO₂粉末以不同的比例分散于一定浓度的PVDF/DMF混合液中，旋涂制备得到PVDF/W_xV_1-xO₂复合薄膜。该薄膜具有较好的金属- 半导体相转变性能，且相转变温度在室温附近。

本实验最终制备得到的掺钨二氧化钒（W_xV_1-xO₂）粉末具备较好的热致相变性能，将其制成质量分数为13% 的PVDF/W_xV_1-xO₂复合薄膜，对其不同W/V的薄膜分别进行透过测试，发现钨掺量的增加会降低薄膜的热致相变性能。

关键词：VO₂材料 金属-半导体相变 W掺杂 W_xV_1-xO₂/PVDF复合薄膜

Preparation and Thermochromic Properties of PVDF/W_xV_1-xO₂ Composite Films

Abstract

The VO₂ material has a good application market in the field of temperature control due to its ability to block infrared light and transmit visible light at high temperatures, transmit infrared light and visible light at low temperatures.

In this paper, VOSO₄ and (NH₄)₁₀W₁₂O₄₁•5H₂O were used as vanadium sources and dopants, and Hydrazinehydrate Diamidhydrate was used as a reducing agent. Finally, tungsten-doped vanadium dioxide was synthesized by a hydrothermal method.The prepared W_xV_1-xO₂ powder was dispersed in a certain concentration of PVDF/DMF mixture at different ratios,and PVDF/W_xV_1-xO₂ composite film was prepared by spin coating.The film has good metal-semiconductor phase transformation properties, and the phase transition temperature is near room temperature.

The tungsten-doped vanadium dioxide (WxV1-xO2) powders prepared in this experiment have good thermal-induced phase change properties, then we made it into a PVDF/WxV1-xO2 composite film with a mass fraction of 13%. We test it for its optical pass, it was found that an increase in tungsten content reduces the thermally induced phase transition of the film.

Key Words: VO₂; Metal-semiconductor phase transition; W-Doping; W_xV_1-xO₂/PVDF composite film

目 录

摘 要 Ⅰ

Abstract Ⅱ

第一章 绪论 1

1.1 引言 1

1.2 热致相变材料 1

1.2.1 热变色材料的类型 2

1.2.2 可逆与不可逆热致变色材料性能对比 2

1.3 二氧化钒 3

1.3.1 金属- 半导体相变 3

1.3.2 薄膜的相变过程 6

1.3.3 研究进展 7

1.3.4 掺杂改性 7

1.3.5 W_xV_1-xO₂的制备 10

第二章 实验部分 11

2.1 实验原料 11

2.2 实验仪器 11

2.3 实验方法 12

2.3.1 制备W_xV_1-xO₂ 12

2.3.2 制备W_xV_1-xO₂/PVDF薄膜 13

2.4 VO₂薄膜表征方法 13

2.4.1 X射线衍射分析 13

2.4.2 扫描电子显微镜形貌分析 13

2.4.3 紫外-可见-近红外分光光度计吸收性能分析 13

第三章 实验数据及分析 16

3.1 物相分析 16

3.2 形貌分析 17

3.3 光学性能 17

第四章 结论与展望 22

4.1 实验结论 22

4.2 实验展望 22

参考文献 23

致谢 26

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