【摘要】：多年來,半導體納米顆粒在一些微納米器件中的應用研究正在引起越來越多的關注。氧化鋅作為一種廉價易得的半導體材料。在光電探測,光催化等領域已有了較為廣泛的研究和應用。但是,由于純的氧化鋅納米顆粒因其較高的能帶間隙(3.37eV)以及較差的穩(wěn)定性,極大的限制了其應用。本文采用以氧化鋅納米顆粒為晶核,通過醋酸根離子的橋連作用合成了獨特的ZnO/Ag納米顆�；祀s枝狀微米結構。通過對該結構進行多方面的表征以及對枝狀結構生長過程的觀察,提出了一種枝狀結構形成的機理,并對該混雜結構在紫外探測器及光催化降解水中有機污染物方面的應用進行了研究。主要的研究內容及結果如下:(1)溶液法合成出形貌及成分可控的ZnO/Ag納米混雜結構。以氧化鋅種子溶液作為晶核,通過銀離子的加入首先在溶液中通過自組裝形成ZnO/AgAc微米結構,然后通過紫外光輻照使原結構中的AgAc分解成銀納米顆粒,從而形成ZnO/Ag異質結構。尺寸及組成均可通過改變合成溶液的濃度和配比來進行調控。(2)以分枝狀結構為研究主體,通過對合成得到的ZnO/Ag混雜結構的多方面表征及對生長條件的控制和生長過程的顯微觀察,提出了一個以醋酸根橋連作用的納米顆粒擴散限制聚集(DLA)模型。(3)將合成得到的分枝狀的ZnO/Ag納米顆�；祀s結構制作成紫外探測器單根微米線器件并對其在紫外探測性能進行了研究。(4)探究了ZnO/Ag混雜結構在不同環(huán)境中光催化降解水中有機物的性能。結果表明ZnO/Ag混雜結構對于亞甲基藍有很好的光催化降解作用,并得出了最佳反應條件.
[Abstract]:Over the years, the application of semiconductor nanoparticles in some microdevices has attracted more and more attention. Zinc oxide is a cheap and readily available semiconductor material. It has been widely studied and applied in the fields of photoelectricity detection, photocatalysis and so on. However, the application of pure ZnO nanoparticles is greatly limited due to their high band gap (3.37eV) and poor stability. In this paper, a unique hybrid dendritic micron structure of ZnO/Ag nanoparticles was synthesized by bridging the acetate ion with zinc oxide nanoparticles as crystal nucleus. The mechanism of the formation of dendritic structure was put forward by observing the growth process of the dendritic structure and characterizing the structure in many aspects. The application of the hybrid structure in UV detector and photocatalytic degradation of organic pollutants in water was studied. The main contents and results are as follows: (1) ZnO/Ag nanostructures with controllable morphology and composition were synthesized by solution method. Using zinc oxide seed solution as crystal nucleus, the ZnO/AgAc micron structure was first formed by self-assembly of silver ions in the solution, and then the AgAc in the original structure was decomposed into silver nanoparticles by UV irradiation, thus the ZnO/Ag heterostructure was formed. The size and composition can be controlled by changing the concentration and proportion of the synthetic solution. (2) the branching structure is the main body of the study. The synthesis of ZnO/Ag hybrid structure was characterized in many aspects, the growth conditions were controlled and the growth process was observed microscopically. In this paper, we propose a (DLA) model of nano-particle diffusion limited aggregation by acetic acid bridged interaction. (3) the branched ZnO/Ag nanoparticles hybrid structure is fabricated into a single micron-wire device for UV detector and detected in UV. (3) the branched ZnO/Ag nanoparticles hybrid structure is synthesized into a single micron wire device for UV detection. (4) the performance of ZnO/Ag hybrid structure in photocatalytic degradation of organic matter in water was investigated in different environments. The results showed that the hybrid structure of ZnO/Ag had good photocatalytic degradation of methylene blue and the optimum reaction conditions were obtained.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.1

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本文編號：2293070