氧化物復(fù)合納米結(jié)構(gòu)的控制合成及其性能研究
發(fā)布時間：2018-11-06 12:11
【摘要】：本文首先利用化學(xué)氣相沉積法合成出花狀ZnO與帶狀SnO_2納米結(jié)構(gòu)。然后以合成的帶狀SnO_2納米結(jié)構(gòu)為基礎(chǔ),結(jié)合溶液法研究了氧化物復(fù)合納米結(jié)構(gòu)的控制合成。還以花狀ZnO為原料制成柔性紫外探測器,并研究了SnO_2復(fù)合ZnO之后的光催化性能和光電化學(xué)性能。第一章從納米科技,納米材料在紫外探測器件的運用,以及納米材料在半導(dǎo)體光催化應(yīng)用三塊分別介紹。納米科技概述了其定義,引出納米材料的物理特性,以及納米材料的合成方式。納米材料在紫外光探測器件的應(yīng)用主要介紹了紫外光探測技術(shù)在其應(yīng)用方向的重要意義,紫外光探測器件的種類和發(fā)展方向,最后論述了納米材料的性質(zhì)應(yīng)用在制備高性能紫外光探測器件擁有巨大優(yōu)勢。納米材料在半導(dǎo)體光催化應(yīng)用,介紹了半導(dǎo)體光催化技術(shù)的凈化環(huán)境方面的突出表現(xiàn),概述了光催化的原理,分析了影響光催化性能的因素。第二章研究了花狀Zn O納米結(jié)構(gòu)的合成,并以其為光電探測材料制備出柔性紫外探測器件,分析了器件的光電性能。具體來說:首先用化學(xué)氣相沉積法,以鋅粉和純氧氣為原料制備出花狀ZnO納米材料,使用掃描電鏡、X射線衍射對其表征和研究。之后我們用非常簡易的“刻劃法”,在鍍金的柔性PET基底上制作柔性紫外探測器件進行試驗。研究結(jié)果表明,該器件在試驗中彎曲了不同角度后所展示出的靈敏度依然很高,而且都能夠在電壓為6v的條件開關(guān)紫外燈時迅速做出反應(yīng)且光電流與暗電流比值高達105。第三章研究了SnO_2納米帶及其復(fù)合納米結(jié)構(gòu)的控制合成。首先,用化學(xué)氣相沉積法(CVD)合成帶狀SnO_2,并通過SEM、XRD測試手段對其表征。接下來,基于帶狀SnO_2納米材料進行復(fù)合研究,分別用乙酸鋅水溶液、乙酸鋅乙醇溶液合成了SnO_2/ZnO復(fù)合納米結(jié)構(gòu),并SEM、EDS、XRD、TEM測試手段對其進行表征。對比分析發(fā)現(xiàn),SnO_2在乙酸鋅乙醇溶液浸泡比在乙酸鋅水溶液浸泡最終得到的SnO_2/ZnO形貌長得更均一,復(fù)合效果更好。第四章研究了SnO_2/ZnO復(fù)合納米結(jié)構(gòu)的光電化學(xué)及光催化性質(zhì)。我們使用三電極法測試樣品光電化學(xué)響應(yīng),將樣品涂在ITO表面形成薄膜制作為工作電極。使用氙燈平行光源來模擬太陽光,我們用電化學(xué)分析儀測試出樣品間歇光照i-t曲線,并對比SnO_2/ZnO與SnO_2的間歇光照i-t曲線。實驗結(jié)果證明,SnO_2與Zn O復(fù)合以后大大提升了光電轉(zhuǎn)化效率,光電流增大明顯,光響應(yīng)十分靈敏,弛豫時間極短,達到了提高光電化學(xué)性能的目的。之后,以SnO_2/ZnO為原料制固定型光催化劑,測試出兩次SnO_2/ZnO復(fù)合材料光催化降解性能,并與純的SnO_2進行對比。實驗結(jié)果證明,SnO_2/ZnO復(fù)合納米材料的光催化降解能力高于純SnO_2的光催化能力,SnO_2/ZnO固定型光催化劑二次使用仍然有較好降解能力。
[Abstract]:Firstly, flower-like ZnO and banded SnO_2 nanostructures were synthesized by chemical vapor deposition. Then the controlled synthesis of oxide composite nanostructures was studied by solution method based on the SnO_2 nanostructures. Flexible UV detectors were prepared from flower-like ZnO and the photocatalytic and photochemical properties of SnO_2 composite ZnO were studied. The first chapter introduces the nanotechnology, the application of nano-materials in UV detectors, and the application of nano-materials in semiconductor photocatalysis. The definition of nanotechnology, the physical properties of nanomaterials and the synthesis of nanomaterials are summarized. The application of nanomaterials in ultraviolet detectors is introduced in this paper. The significance of ultraviolet detection technology in its application direction, the types and development direction of ultraviolet detectors are introduced. Finally, the properties and applications of nanomaterials in the preparation of high performance UV detectors have great advantages. The application of nanomaterials in semiconductor photocatalysis is reviewed. The outstanding performance of semiconductor photocatalytic technology in purifying environment is introduced, the principle of photocatalysis is summarized, and the factors affecting photocatalytic performance are analyzed. In chapter 2, the synthesis of flower-like Zn O nanostructures is studied, and the flexible ultraviolet detectors are prepared by using them as photodetector materials. The photoelectric properties of the devices are analyzed. Specifically, the flower-like ZnO nanomaterials were prepared by chemical vapor deposition with zinc powder and pure oxygen as raw materials. They were characterized and studied by scanning electron microscope (SEM) and X-ray diffraction (XRD). After that, we fabricated flexible UV detectors on a gold-plated flexible PET substrate by a very simple "scribing method". The results show that the sensitivity of the device is still very high after bending different angles in the experiment, and it can react quickly when the voltage is 6 v, and the ratio of photocurrent to dark current is as high as 105. In chapter 3, the controlled synthesis of SnO_2 nanobelts and their composite nanostructures are studied. Firstly, (CVD) was synthesized by chemical vapor deposition and characterized by SEM,XRD. Then, based on the ribbon SnO_2 nanocomposites, SnO_2/ZnO nanostructures were synthesized by zinc acetate aqueous solution and zinc acetate ethanol solution, respectively, and characterized by SEM,EDS,XRD,TEM. It was found that the morphology of SnO_2 in zinc acetate ethanol solution was more uniform than that in zinc acetate solution, and the composite effect was better than that in zinc acetate solution. In chapter 4, the photochemical and photocatalytic properties of SnO_2/ZnO nanostructures are studied. Three electrode method was used to measure the photochemical response of the sample. The sample was coated on the surface of ITO to form a thin film to be a working electrode. The parallel light source of xenon lamp was used to simulate solar light. We measured the I-t curves of samples by electrochemical analyzer, and compared the I-t curves of SnO_2/ZnO and SnO_2. The experimental results show that the photoconversion efficiency of SnO_2 and Zn O is greatly improved, the photocurrent increases obviously, the photoresponse is very sensitive, and the relaxation time is very short. After that, the photocatalytic degradation of SnO_2/ZnO composite was determined by using SnO_2/ZnO as raw material and the photocatalytic degradation was compared with that of pure SnO_2. The experimental results show that the photocatalytic degradation ability of SnO_2/ZnO nanocomposite is higher than that of pure SnO_2, and the secondary use of SnO_2/ZnO fixed photocatalyst still has good degradation ability.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1
本文編號：2314222
[Abstract]:Firstly, flower-like ZnO and banded SnO_2 nanostructures were synthesized by chemical vapor deposition. Then the controlled synthesis of oxide composite nanostructures was studied by solution method based on the SnO_2 nanostructures. Flexible UV detectors were prepared from flower-like ZnO and the photocatalytic and photochemical properties of SnO_2 composite ZnO were studied. The first chapter introduces the nanotechnology, the application of nano-materials in UV detectors, and the application of nano-materials in semiconductor photocatalysis. The definition of nanotechnology, the physical properties of nanomaterials and the synthesis of nanomaterials are summarized. The application of nanomaterials in ultraviolet detectors is introduced in this paper. The significance of ultraviolet detection technology in its application direction, the types and development direction of ultraviolet detectors are introduced. Finally, the properties and applications of nanomaterials in the preparation of high performance UV detectors have great advantages. The application of nanomaterials in semiconductor photocatalysis is reviewed. The outstanding performance of semiconductor photocatalytic technology in purifying environment is introduced, the principle of photocatalysis is summarized, and the factors affecting photocatalytic performance are analyzed. In chapter 2, the synthesis of flower-like Zn O nanostructures is studied, and the flexible ultraviolet detectors are prepared by using them as photodetector materials. The photoelectric properties of the devices are analyzed. Specifically, the flower-like ZnO nanomaterials were prepared by chemical vapor deposition with zinc powder and pure oxygen as raw materials. They were characterized and studied by scanning electron microscope (SEM) and X-ray diffraction (XRD). After that, we fabricated flexible UV detectors on a gold-plated flexible PET substrate by a very simple "scribing method". The results show that the sensitivity of the device is still very high after bending different angles in the experiment, and it can react quickly when the voltage is 6 v, and the ratio of photocurrent to dark current is as high as 105. In chapter 3, the controlled synthesis of SnO_2 nanobelts and their composite nanostructures are studied. Firstly, (CVD) was synthesized by chemical vapor deposition and characterized by SEM,XRD. Then, based on the ribbon SnO_2 nanocomposites, SnO_2/ZnO nanostructures were synthesized by zinc acetate aqueous solution and zinc acetate ethanol solution, respectively, and characterized by SEM,EDS,XRD,TEM. It was found that the morphology of SnO_2 in zinc acetate ethanol solution was more uniform than that in zinc acetate solution, and the composite effect was better than that in zinc acetate solution. In chapter 4, the photochemical and photocatalytic properties of SnO_2/ZnO nanostructures are studied. Three electrode method was used to measure the photochemical response of the sample. The sample was coated on the surface of ITO to form a thin film to be a working electrode. The parallel light source of xenon lamp was used to simulate solar light. We measured the I-t curves of samples by electrochemical analyzer, and compared the I-t curves of SnO_2/ZnO and SnO_2. The experimental results show that the photoconversion efficiency of SnO_2 and Zn O is greatly improved, the photocurrent increases obviously, the photoresponse is very sensitive, and the relaxation time is very short. After that, the photocatalytic degradation of SnO_2/ZnO composite was determined by using SnO_2/ZnO as raw material and the photocatalytic degradation was compared with that of pure SnO_2. The experimental results show that the photocatalytic degradation ability of SnO_2/ZnO nanocomposite is higher than that of pure SnO_2, and the secondary use of SnO_2/ZnO fixed photocatalyst still has good degradation ability.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1
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