【摘要】：多年來(lái),半導(dǎo)體納米顆粒在一些微納米器件中的應(yīng)用研究正在引起越來(lái)越多的關(guān)注。氧化鋅作為一種廉價(jià)易得的半導(dǎo)體材料。在光電探測(cè),光催化等領(lǐng)域已有了較為廣泛的研究和應(yīng)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(yīng)用。本文采用以氧化鋅納米顆粒為晶核,通過(guò)醋酸根離子的橋連作用合成了獨(dú)特的ZnO/Ag納米顆�；祀s枝狀微米結(jié)構(gòu)。通過(guò)對(duì)該結(jié)構(gòu)進(jìn)行多方面的表征以及對(duì)枝狀結(jié)構(gòu)生長(zhǎng)過(guò)程的觀察,提出了一種枝狀結(jié)構(gòu)形成的機(jī)理,并對(duì)該混雜結(jié)構(gòu)在紫外探測(cè)器及光催化降解水中有機(jī)污染物方面的應(yīng)用進(jìn)行了研究。主要的研究?jī)?nèi)容及結(jié)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(jié)構(gòu)。以氧化鋅種子溶液作為晶核,通過(guò)銀離子的加入首先在溶液中通過(guò)自組裝形成ZnO/AgAc微米結(jié)構(gòu),然后通過(guò)紫外光輻照使原結(jié)構(gòu)中的AgAc分解成銀納米顆粒,從而形成ZnO/Ag異質(zhì)結(jié)構(gòu)。尺寸及組成均可通過(guò)改變合成溶液的濃度和配比來(lái)進(jìn)行調(diào)控。(2)以分枝狀結(jié)構(gòu)為研究主體,通過(guò)對(duì)合成得到的ZnO/Ag混雜結(jié)構(gòu)的多方面表征及對(duì)生長(zhǎng)條件的控制和生長(zhǎng)過(guò)程的顯微觀察,提出了一個(gè)以醋酸根橋連作用的納米顆粒擴(kuò)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(jié)構(gòu)制作成紫外探測(cè)器單根微米線器件并對(duì)其在紫外探測(cè)性能進(jìn)行了研究。(4)探究了ZnO/Ag混雜結(jié)構(gòu)在不同環(huán)境中光催化降解水中有機(jī)物的性能。結(jié)果表明ZnO/Ag混雜結(jié)構(gòu)對(duì)于亞甲基藍(lán)有很好的光催化降解作用,并得出了最佳反應(yīng)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(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383.1

【相似文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 李嘉;ZnO-Ag納米顆粒異質(zhì)結(jié)構(gòu)自組裝的研究及應(yīng)用[D];華中科技大學(xué);2015年

2 孫發(fā)哲;納米ZnO和ZnO-Ag異質(zhì)結(jié)的制備及抗菌性能研究[D];華中科技大學(xué);2009年

，

本文編號(hào)：2293070