發(fā)布時間：2018-06-14 10:27

  本文選題：薄膜 + 結(jié)構(gòu)色　； 參考：《河北師范大學(xué)》2016年碩士論文

【摘要】：研究者們發(fā)現(xiàn)結(jié)構(gòu)色具有虹彩效應(yīng)、高反射率、偏振性等優(yōu)點(diǎn)。近些年大量的實(shí)驗(yàn)研究已經(jīng)證明結(jié)構(gòu)色與微觀結(jié)構(gòu)之間有著密切關(guān)系,因此,與結(jié)構(gòu)色類似的仿生體系引起了廣泛的研究興趣。人們發(fā)現(xiàn)PAA能夠制備出具有結(jié)構(gòu)色的薄膜,這些薄膜在防偽、裝飾等領(lǐng)域有著廣泛的應(yīng)用。本文采用一次陽極氧化法在磷酸電解液中制備出PAA薄膜,然后以PAA為模板通過交流電化學(xué)沉積法將Cu納米線沉積到PAA薄膜孔洞的底部,得到具有結(jié)構(gòu)色的Cu@PAA納米復(fù)合薄膜。詳細(xì)的分析了薄膜的微觀結(jié)構(gòu)及光學(xué)特性。此外,采用二次陽極氧化法制備的PAA薄膜因具有高度有序納米孔洞陣列得到廣泛地應(yīng)用。正如我們所知,多孔PAA薄膜擁有較大的比表面積致使孔洞內(nèi)產(chǎn)生大量的氧空位,同時對薄膜的物理性質(zhì)也有重要的影響,比如鐵磁性、電阻開關(guān)特性。因此,我們以PAA為基底,利用直流磁控濺射法制備出多孔Cu_2O,TiO_2復(fù)合薄膜,通過多種表征手段研究這些多孔復(fù)合薄膜的物理性質(zhì)。其結(jié)果分析如下:(1)室溫下,采用一次陽極氧化法在磷酸電解液中制備出一系列PAA/Al薄膜,以此為模板再通過交流電化學(xué)沉積法沉積了金屬Cu,得到具有結(jié)構(gòu)色的Cu@PAA復(fù)合薄膜,其顏色飽和度明顯的提高了。調(diào)控不同的氧化時間,復(fù)合薄膜可以得到不同的顏色,且在整個可見光范圍內(nèi)都是可調(diào)控的。紫外可見反射光譜顯示,隨著氧化時間的增加,薄膜的最大反射波長λmax存在紅移現(xiàn)象。另外,根據(jù)布拉格公式計算的復(fù)合薄膜的有效折射率、最大反射波長λmax的理論值與實(shí)驗(yàn)結(jié)果吻合較好。最后,我們采用有機(jī)輔助方法制備出精美多彩的圖案。(2)采用直流磁控濺射方法在PAA基底上鍍一層Cu_2O薄膜。在無外加偏置磁場的情況下,通過施加具有可逆性和可重復(fù)性的電場能夠調(diào)控Cu_2O/PAA復(fù)合薄膜的磁化強(qiáng)度,并且發(fā)現(xiàn)復(fù)合薄膜具有電阻開關(guān)行為。紫外可見光譜測試證明Cu_2O/PAA復(fù)合薄膜中存在大量的氧空位。進(jìn)一步分析表明復(fù)合薄膜中導(dǎo)電細(xì)絲的形成和斷裂與氧空位有著密切的關(guān)系。此外,對樣品施加電場能夠觸發(fā)到不同阻態(tài),因此,室溫下通過施加小電場就能夠調(diào)控復(fù)合薄膜的磁性。(3)采用直流磁控濺射方法在PAA基底上鍍一層TiO_2薄膜。紫外可見光譜測試證明TiO_2/PAA復(fù)合薄膜中存在大量的氧空位。我們在Ag/TiO_2/PAA/Al器件中發(fā)現(xiàn)雙極阻變特性,導(dǎo)電細(xì)絲的形成和斷裂以及器件能被觸發(fā)到不同阻態(tài)都與氧空位有著密切關(guān)系。只需我們給器件施加一個小電壓,電阻就會產(chǎn)生明顯的轉(zhuǎn)換。在制備態(tài)復(fù)合薄膜中觀察到穩(wěn)定的雙極電阻行為能夠調(diào)控鐵磁性的變化。其觸發(fā)到高阻態(tài)下測試的樣品的磁化強(qiáng)度是制備態(tài)下測試的樣品的磁化強(qiáng)度的三倍。對Ag/TiO_2/PAA/Al器件連續(xù)十圈的循環(huán)測試進(jìn)一步證明樣品的穩(wěn)定性能。
[Abstract]:The researchers found that structural colors have the advantages of iris effect, high reflectivity, polarization and so on. In recent years, a large number of experimental studies have proved that there is a close relationship between structural color and microstructure. Therefore, biomimetic systems similar to structural colors have attracted extensive research interest. It has been found that PAA can produce structured color films, which are widely used in anti-counterfeiting, decoration and other fields. In this paper, PAA thin films were prepared by primary anodization method in phosphoric acid electrolyte. Then Cu nanowires were deposited into the bottom of the pores of PAA films by alternating current electrochemical deposition using PAA as template. The microstructure and optical properties of the films were analyzed in detail. In addition, PAA thin films prepared by secondary anodization have been widely used because of their highly ordered nano-porous arrays. As we know, porous PAA thin films have a large specific surface area, resulting in a large number of oxygen vacancies in the pores, and also have an important impact on the physical properties of the films, such as ferromagnetism, resistance switching characteristics. Therefore, porous Cu2OTiO-2 composite films were prepared by DC magnetron sputtering on PAA substrate. The physical properties of these porous composite films were studied by various characterization methods. The results are as follows: (1) at room temperature, a series of PAA / Al thin films were prepared by primary anodization method in phosphoric acid electrolyte. Its color saturation is obviously increased. When the oxidation time is different, the composite film can get different color and can be controlled in the whole visible light range. UV-Vis reflectance spectra show that with the increase of oxidation time, the maximum reflectance wavelength 位 max of the film is red-shifted. In addition, the theoretical values of the effective refractive index and the maximum reflection wavelength 位 max calculated by the Bragg formula are in good agreement with the experimental results. Finally, we prepared a colorful pattern by organic assisted method. (2) A CuS2O thin film was deposited on PAA substrate by DC magnetron sputtering. In the absence of an applied bias magnetic field, the magnetization of Cu _ S _ 2O / PAA composite films can be regulated by applying a reversible and repeatable electric field, and it is found that the composite films have resistive switching behavior. UV-Vis spectra show that there are a lot of oxygen vacancies in CuS / PAA composite films. Further analysis shows that the formation and fracture of conductive filament in the composite film are closely related to the oxygen vacancy. In addition, the application of electric field to the sample can trigger different resistance states. Therefore, the magnetic properties of the composite films can be controlled by applying a small electric field at room temperature) the TiO-2 thin films are deposited on PAA substrates by DC magnetron sputtering. UV-Vis spectra show that there are a lot of oxygen vacancies in TIO _ 2 / PAA composite films. We found that the bipolar resistance of Ag- / TiO-2 / PAA- Al devices, the formation and fracture of conductive filaments and the ability of devices to be triggered to different resistance states are closely related to oxygen vacancies. If we apply a small voltage to the device, the resistance will produce a significant conversion. Stable bipolar resistive behavior was observed in the prepared composite films to regulate the change of ferromagnetism. The magnetization of the samples triggered to the high resistance state is three times that of the samples tested in the prepared state. The stability of the sample was further proved by the cyclic test of Ag- / TiO-2 / PAA / Al devices for 10 consecutive cycles.
【學(xué)位授予單位】：河北師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：O484

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本文編號：2017072