摘要
二氧化釩粉末因具有熱致變特性可作為智慧型控溫材料，而二氧化鈦光觸媒有自潔除汙效果。本研究旨在結合兩種綠色材料之性能，以溶膠凝膠法製備Ti1-xVxO2粉末，達到控溫防汙建築材料而符合節能環保的目標。
本實驗將Ti(OiPr)4及VO(OiPr)3加入Glacial acetic acid製備不同比例之溶液，再混入PVP、HTAB和2-propanol中做為前驅物，經由Thermogravimetric analysis (TGA)分析前驅物各階段之熱解溫度；利用Fourier transform infrared (FT-IR) spectrometer確認前驅物官能基；並由TGA得到煆燒溫度後，前驅物經550℃煆燒一小時得Ti1-xVxO2粉末。煆燒後，使用Scanning electron microscope (SEM)觀察粉末表面形態經由Energy dispersive spectrometer (EDS)分析將Ti1-xVxO2 粉末標定為Ti1-V2-PVP複合粉末、Ti1-V1-PVP複合粉末、Ti2-V1-PVP複合粉末並觀察表面分別有齒輪狀、海膽狀及六角柱狀顆粒型態；利用X-ray diffraction (XRD)分析晶體結構，Ti1-V1-PVP複合粉末有TiVO4、TiO2(Anatase)、V2O5及VO2晶相，然而Ti1-V2-PVP複合粉末、Ti2-V1-PVP複合粉末則有TiO2(Anatase)及VO2晶相存在；觀察 transmission electron microscope (TEM)得到Particle大小約10nm；Differential scanning calorimetry (DSC)分析粉末Ti1-V2-PVP複合粉末、Ti1-V1-PVP複合粉末、Ti2-V1-PVP複合粉末之相轉變溫度分別為58.2℃、77.3℃和59.1℃；Ti1-V2-PVP複合粉末、Ti1-V1-PVP複合粉末、Ti2-V1-PVP複合粉末以Ultraviolet and visible spectroscopy (UV-Vis)測試經亞甲基藍液照射紫外光後被降解率分別為79.6%、 80.5% 和 99.6%。由以上分析，可知Ti1-xVxO2 粉末材料包含了TiO2(Anatase)及VO2之特性優點。

Vanadium dioxide (VO2) is regarded as a “green” material, which could be applied on windows of a building to save energy due to the thermally-reversible phase transition property. In addition, titanium dioxide (TiO2) exhibiting hydrophilic and photocatalytic properties is known as a self-cleaning material when applied on the window of a building. We attempted to synthesize TiO2-VO2 hybrid materials to include both functions of saving energy and self-cleaning in one materials.
Ti(OiPr)4, VO(OiPr)3 and glacial acetic acid containing various ratios were used to mix with PVP、HTAB and 2-propanol to be precursors. Thermogravimetric analysis (TGA) is used to observe the pyrolysis temperature of precursors for each stage. We confirmed the functional groups of precursor by fourier transform infrared (FT-IR) spectrometer. Sequentially, precursors are sintered at 550℃, obtaining from TGA, for one hour to obtain Ti1-xVxO2 materials. The Ti1-xVxO2 materials demonstrated various nanostructures under scanning electron microscope (SEM) observation. These Ti1-xVxO2 materials were defined by energy sispersive spectrometer (EDS) analysis. The results illustrate that Ti1-V2-PVP composite powder, Ti1-V1-PVP composite powder and Ti2-V1-PVP composite powder demonstrated echinus-like, hexagonal column and gear-like configurations. X-ray diffraction (XRD) analysis indicated that Ti1-V1-PVP composite powder was composd by several lattice structures including TiVO4, TiO2(Anatase), V2O5 and VO2. While Ti1-V2-PVP composite powder and Ti2-V1-PVP composite powder demonstrated pure lattice of TiO2(Anatase) and VO2, respectively. The phase transition temperatures of Ti1-V2-PVP composite powder, Ti1-V1-PVP composite powder and Ti2-V1-PVP composite powder were 58.2℃, 77.3℃ and 59.1℃ from differential scanning calorimetry (DSC) measurement, respectively. The decomposition efficiency of Methylene blue for Ti1-V2-PVP composite powder, Ti1-V1-PVP composite powder ,and Ti2-V1-PVP composite powder approach to 79.6%, 80.5% and 99.6% under UV exposure. We found a novel material including two advantages of TiO2 and VO2 in our work.

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