论文部分内容阅读
以聚乙二醇(PEG)为软模板剂,采用一步水热法合成了具有异质结构的铜–二氧化钛复合纳米粒子.利用X射线衍射谱(XRD)、透射电子显微镜(TEM)等分别对制备材料的相组成、微观结构进行了研究.结果表明,一步水热法制备的异质纳米粒子由单一立方相铜和锐钛矿相二氧化钛组成.高分辨透射电子显微镜(HRTEM)在单一粒子中观测到清晰的铜(101)和二氧化钛(111)晶面构成的界面.该界面有助于二氧化钛光生电子–空穴对的分离.同时,所制备纳米粒子的颗粒尺寸和光吸收特性可以通过改变PEG分子链长进行微调.本研究还对水热过程的反应机理进行了讨论,结果表明:PEG与铜氨络合物通过氢键连接,其链长对于粒子尺寸的影响在于PEG对Cu颗粒的尺寸进行的调节,而此过程中二氧化钛的晶粒尺寸并无明显变化.紫外–可见吸收光谱表明该异质纳米粒子与普通二氧化钛纳米粉体相比,对可见光区光谱有较为强烈的吸收.该界面纳米材料是一种有潜在应用价值的光催化材料和太阳能电池材料.
Polyethylene glycol (PEG) was used as soft template to synthesize copper-titanium dioxide composite nanoparticles with heterostructures by one-step hydrothermal method. XRD, TEM, The phase composition and microstructure of the prepared materials were studied.The results showed that the single-phase hydrothermal method prepared by the single-phase phase heterogeneous nanoparticles of copper and anatase phase titanium dioxide high resolution transmission electron microscopy (HRTEM) in a single particle A clear interface between the copper (101) and titanium (111) crystal planes was observed, which contributed to the photocatalytic electron-hole pair separation of titanium dioxide.At the same time, the particle size and optical absorption properties of the prepared nanoparticles were investigated by changing the PEG Molecular chain length of fine tuning.This study also discussed the hydrothermal reaction mechanism, the results show that: PEG and copper ammonia complex by hydrogen bonding, the chain length of the particle size of the effect of PEG on the size of Cu particles , And in this process there is no obvious change in the grain size of titanium dioxide.Ultraviolet-visible absorption spectroscopy shows that compared with ordinary titanium dioxide nano-powder, The visible region of the spectrum has a relatively strong absorption. The interface nanomaterials have potential application is a photocatalytic material and solar cell materials.