ZnO-Ag纳米颗粒异质结构自组装的研究及应用
发布时间：2018-10-25 07:42
【摘要】：多年来,半导体纳米颗粒在一些微纳米器件中的应用研究正在引起越来越多的关注。氧化锌作为一种廉价易得的半导体材料。在光电探测,光催化等领域已有了较为广泛的研究和应用。但是,由于纯的氧化锌纳米颗粒因其较高的能带间隙(3.37eV)以及较差的稳定性,极大的限制了其应用。本文采用以氧化锌纳米颗粒为晶核,通过醋酸根离子的桥连作用合成了独特的ZnO/Ag纳米颗粒混杂枝状微米结构。通过对该结构进行多方面的表征以及对枝状结构生长过程的观察,提出了一种枝状结构形成的机理,并对该混杂结构在紫外探测器及光催化降解水中有机污染物方面的应用进行了研究。主要的研究内容及结果如下:(1)溶液法合成出形貌及成分可控的ZnO/Ag纳米混杂结构。以氧化锌种子溶液作为晶核,通过银离子的加入首先在溶液中通过自组装形成ZnO/AgAc微米结构,然后通过紫外光辐照使原结构中的AgAc分解成银纳米颗粒,从而形成ZnO/Ag异质结构。尺寸及组成均可通过改变合成溶液的浓度和配比来进行调控。(2)以分枝状结构为研究主体,通过对合成得到的ZnO/Ag混杂结构的多方面表征及对生长条件的控制和生长过程的显微观察,提出了一个以醋酸根桥连作用的纳米颗粒扩散限制聚集(DLA)模型。(3)将合成得到的分枝状的ZnO/Ag纳米颗粒混杂结构制作成紫外探测器单根微米线器件并对其在紫外探测性能进行了研究。(4)探究了ZnO/Ag混杂结构在不同环境中光催化降解水中有机物的性能。结果表明ZnO/Ag混杂结构对于亚甲基蓝有很好的光催化降解作用,并得出了最佳反应条件.
[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.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
本文编号：2293070
[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.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
【相似文献】
相关硕士学位论文 前2条
1 李嘉;ZnO-Ag纳米颗粒异质结构自组装的研究及应用[D];华中科技大学;2015年
2 孙发哲;纳米ZnO和ZnO-Ag异质结的制备及抗菌性能研究[D];华中科技大学;2009年
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