本文關(guān)鍵詞：氧化釩—定向碳納米管復(fù)合膜的制備與特性研究　出處：《電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 氧化釩 定向性碳納米管 吹泡法 電學(xué)特性 光學(xué)特性

【摘要】：自然界中,偏振光廣泛存在。利用偏振光可在沙塵、水下等特殊條件下成像、導(dǎo)航,甚至用于診斷癌細(xì)胞等。奇妙的是,很多動(dòng)物進(jìn)化出了感知入射偏振信號(hào)的能力,如蜜蜂通過感知紫外偏振光導(dǎo)航,螳螂蝦利用偏振光在水下辨別方向等�？上祟悰]有該感知力。然而,一些微納功能薄膜有望賦予人類該感知力,如“面內(nèi)”定向的碳納米管薄膜。由于碳納米管的分散及排列較難,而單根碳納米管與光子弱相互作用,所以關(guān)于定向碳納米管薄膜偏振成像的相關(guān)研究報(bào)道較少。然而,由于碳納米管溫度熱敏系數(shù)較低等原因,所以本文希望通過其與熱敏材料復(fù)合來實(shí)現(xiàn)偏振響應(yīng)。在眾多熱敏材料中,氧化釩由于綜合性能較好而備受業(yè)界關(guān)注。本論文的主要研究內(nèi)容是氧化釩-定向碳納米管的復(fù)合薄膜的制備與性能研究。首先,優(yōu)化了制備氧化釩薄膜的工藝參數(shù)。采用溶膠-凝膠法,在不同反應(yīng)溫度和退火時(shí)間條件下制備了不同的氧化釩薄膜。對(duì)溶膠化學(xué)結(jié)構(gòu)及相關(guān)薄膜的電學(xué)、光學(xué)性能等進(jìn)行了系統(tǒng)研究。研究優(yōu)化了兩個(gè)工藝參數(shù)對(duì)所制備薄膜形態(tài)及性能的影響：(a)不同溶膠的反應(yīng)溫度：反應(yīng)溫度條件為110℃時(shí),更利于氧化釩溶膠網(wǎng)絡(luò)(O=V-O-V=O)的生成。與其它反應(yīng)溫度制得的薄膜相比,相應(yīng)薄膜具有最低的電阻(5.5-8.5 MΩ),且TCR較高,有更低的紅外波段透過率；(b)不同的退火時(shí)間：與其它退火時(shí)間制得的薄膜相比,退火時(shí)間1 h,電阻較低(13-32MΩ), TCR較高,且在紅外波段吸收率較高。退火時(shí)間宜介于0.5-2小時(shí)。其次,在優(yōu)化了氧化釩溶膠的制備工藝的基礎(chǔ)上,通過溶膠-凝膠法,使功能化碳納米管與氧化釩相復(fù)合,制備氧化釩-隨機(jī)取向碳納米管復(fù)合薄膜。與單純的氧化釩薄膜相比,氧化釩-碳納米管復(fù)合膜的方阻和光學(xué)帶隙減小,而電阻溫度系數(shù)和光吸收率相應(yīng)增大,而且,復(fù)合膜還具有更高的載流子遷移速率。最后,采用新穎的吹泡法,將碳納米管定向排列。然后,在基于前述已經(jīng)優(yōu)化了的氧化釩溶膠制備工藝及復(fù)合薄膜性能的基礎(chǔ)上,結(jié)合傳統(tǒng)的旋涂法將定向的碳納米管轉(zhuǎn)移至已經(jīng)旋涂有氧化釩溶膠的基底上并進(jìn)行退火處理,制備氧化釩-定向碳納米管復(fù)合薄膜。結(jié)果顯示,碳納米管被很好地可控定向并與氧化釩均勻融合。特別是,該復(fù)合薄膜的電學(xué)、光學(xué)各向異性被首次實(shí)驗(yàn)觀測到�；谏鲜鰧�(shí)驗(yàn)結(jié)果,建立推導(dǎo)了光學(xué)吸收模型。該文揭示了有價(jià)值的新型氧化釩-定向性碳納米管復(fù)合薄膜的制備及特異電學(xué)、光學(xué)性能,及其在偏振成像方面的潛在價(jià)值。
[Abstract]:In nature, polarized light widely exists. The use of polarized light can be used in dust, underwater and other special conditions imaging, navigation, and even for the diagnosis of cancer cells. Many animals have evolved the ability to sense incident polarized signals, such as the ability of bees to navigate by sensing ultraviolet polarized light, and mantis shrimp to use polarized light to identify directions under water. Unfortunately, humans do not have this perception. Some micro and nano functional thin films are expected to give the human perception, such as "in-plane" oriented carbon nanotube films. Because of the difficult dispersion and arrangement of carbon nanotubes, single carbon nanotubes interact weakly with photons. Therefore, there are few reports on the polarization imaging of oriented carbon nanotubes films. However, due to the low temperature sensitivity coefficient of carbon nanotubes and so on. Therefore, this paper hopes to achieve polarization response through its composite with thermosensitive materials, in many thermosensitive materials. Vanadium oxide has attracted much attention due to its good comprehensive properties. The main research content of this thesis is the preparation and properties of vanadium oxide / oriented carbon nanotubes composite films. The process parameters of vanadium oxide thin films were optimized. Different vanadium oxide thin films were prepared under different reaction temperature and annealing time by sol-gel method. The effects of two technological parameters on the morphology and properties of the films were studied and optimized. The reaction temperatures of different sols were optimized: the reaction temperature was 110 鈩，

本文編號(hào)：1436446