本文選題：氧化鎢 + 水熱合成　； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：WO3是一種重要的無(wú)機(jī)半導(dǎo)體過(guò)渡金屬氧化物材料，在智能窗、顯示器件、光電開(kāi)關(guān)及信息存儲(chǔ)器等方面具有很好的應(yīng)用前景，自上個(gè)世紀(jì)50年代以來(lái)一直受到廣大科研工作者的青睞。納米材料具有特殊的微觀結(jié)構(gòu)，由于其小尺寸效應(yīng)使性能與宏觀大尺寸材料有顯著的差異，可廣泛應(yīng)用于化學(xué)、物理學(xué)、電子學(xué)、光學(xué)、機(jī)械、軍事和生物醫(yī)藥等方面。由于納米粒子的微觀結(jié)構(gòu)，尺寸和形貌等因素對(duì)材料的特性及應(yīng)用會(huì)產(chǎn)生重要影響，故對(duì)于納米粒子形貌的控制研究也引起了人們的極大關(guān)注。納米WO3材料的小尺寸效應(yīng)，界面效應(yīng)和場(chǎng)發(fā)射效應(yīng)等，使其在光、電、磁、電子等方面都具有廣闊的應(yīng)用前景。因此，如果我們能夠在形貌和微觀結(jié)構(gòu)上對(duì)WO3施加穩(wěn)定的影響，就能在多方面改善WO3在各領(lǐng)域中的應(yīng)用。 光致變色是指在激發(fā)光源的照射下，材料的顏色可以發(fā)生變化，當(dāng)對(duì)材料加熱或用另一波長(zhǎng)的光照射后其顏色會(huì)恢復(fù)，這是一個(gè)在外界條件下可逆的過(guò)程。光致變色因其對(duì)顏色的敏感性及一定條件下的可逆性，使得光致變色材料在數(shù)據(jù)存儲(chǔ)器、顯示器、智能窗、軍事偽裝等領(lǐng)域具有廣闊的應(yīng)用前景。在很長(zhǎng)的一段時(shí)間里，研究的重點(diǎn)一直集中在有機(jī)光致變色材料上，對(duì)無(wú)機(jī)材料的研究很少。然而自從Deb的開(kāi)創(chuàng)性工作之后，越來(lái)越多的研究重點(diǎn)集中到了過(guò)渡金屬氧化物熒光材料上來(lái)，尤其是WO3和MoO3。 本實(shí)驗(yàn)通過(guò)簡(jiǎn)單的水熱合成法，，以鎢酸鈉為鎢源，用鹽酸對(duì)溶液進(jìn)行酸化，再使用草酸溶解沉淀制成前驅(qū)體。通過(guò)在前驅(qū)體中加入不同的還原或非還原物質(zhì)，在不同的溫度下水熱合成制備了多種顏色，多種形貌的納米級(jí)氧化鎢粉體，并通過(guò)XRD，XPS，SEM，UV-vis，PL等測(cè)試手段對(duì)產(chǎn)品的形貌和光學(xué)性能進(jìn)行了表征和比較。研究發(fā)現(xiàn)藍(lán)色氧化鎢樣品具有更好的光吸收率和光致變色強(qiáng)度，且相比于傳統(tǒng)的工業(yè)制藍(lán)色氧化鎢在空氣中具有更好的穩(wěn)定性，具有長(zhǎng)遠(yuǎn)的應(yīng)用前景。
[Abstract]:WO3 is an important inorganic semiconductor transition metal oxide material, which has a good application prospect in smart windows, display devices, optoelectronic switches and information memory, etc. Since the 50's of last century, has been favored by the majority of scientific research workers. Nanomaterials have special microstructure. Because of their small size effects, the properties of nanomaterials are obviously different from those of macroscopical materials. They can be widely used in chemistry, physics, electronics, optics, machinery, military and biomedicine. As the microstructure, size and morphology of nanoparticles have an important impact on the properties and applications of the materials, the control of the morphology of nanoparticles has attracted great attention. The small size effect, interface effect and field emission effect of nanometer WO3 materials make them have a broad application prospect in light, electricity, magnetism, electron and so on. Therefore, if we can exert a stable influence on the morphology and microstructure of WO3, we can improve the application of WO3 in various fields. Photochromism means that the color of the material can change under the irradiation of the excited light source. When the material is heated or irradiated with another wavelength, the color of the material will recover, which is a reversible process under the external conditions. Because of its sensitivity to color and reversibility under certain conditions, photochromic materials have broad application prospects in data storage, display, intelligent window, military camouflage and so on. For a long time, the focus of research has been on organic photochromic materials, but little on inorganic materials. However, since Deb's pioneering work, more and more research has focused on transition metal oxide fluorescent materials, especially WO3 and Moo _ 3. In this experiment, the solution was acidified by hydrochloric acid with sodium tungstate as tungsten source by a simple hydrothermal synthesis method, and then the precursor was prepared by oxalic acid dissolution and precipitation. Nanocrystalline tungsten oxide powders of various colors and morphologies were prepared by adding different reductive or non-reductive substances to the precursor and hydrothermal synthesis at different temperatures. The morphology and optical properties of the products were characterized and compared by means of XRDX, XRDX, SEMU, UV-vis-PL and so on. It is found that the blue tungsten oxide has better photoabsorption rate and photochromic intensity, and has better stability in air than the traditional industrial tungsten oxide, and has a long-term application prospect.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB383.1;TQ136.13

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