The Study On Nonlinear Electrical And Optical Properties Of Organic And Metallic Composite Nano-films

In recent years, due to the different between nano-metal and bulks, the physical and chemical properties of nano-metal has been studied extensively in many areas. Because of the crystalline nature of many metal elements, it lead to the composed of amorphous particles and micro crystal particles when prepared to be the nano-films at nanometer scale. In order to improve the conductive properties of the particles or increase the resistivity, it will be bound to add non-conductive material even if some functional elements. This method is to enhance the physical and chemical properties. Thus the electrical and optical properties of the film will be related to metal type, particle size, film thickness, material type ligand, preparation process and other factors. This issue discuss the electoral and optical properties of the metal nanoparticles and that of small molecule organic fluorescent material nanoparticles.In this paper, the composite structure films prepared by a low vacuum sputtering method has gold nanoparticles. Though adjusting the metal film thickness, annealing or not, an the types of composite material, the fluorescent properties of the gold nanoparticles can be changed. We can see from SEM and XRD of samples, when composite material exist and without annealed, the shorter time sputter, the smaller size of particles are. The composite material have an effect on gold particles aggregation. The grain size increase significantly through annealing. RSS shows that gold nanoparticles react with composite material, and it turns into a substance with new structure which has special Raman peaks. UV-Vis results show that the composite films, under different conditions, have differences in the ability of UV absorption. The emission spectra of fluorescence tell that the fluorescence intensity and efficiency relate to the composite material, thickness and annealing or not.SEM, Ⅰ-Ⅴ and fluorescence emission spectra indicate that the aluminum in the nano-aluminum film, prepared by vacuum deposition method, present in particulate form. The particle size is approximate 30 to 60 nm, the spacing between nanoparticles is from 1 to 10nm. The calculated simulation is approximately matched with the experiment results. A non-linear electrical properties appear when the thickness of the sample become thin (under 30nm). When the thickness reaches 30 nm or above, curves of the simple is close to bulk metallic nature. The results of nano fluorescence emission spectra show that nano-aluminum have influence on the structure of DPO. It results to the changing of fluorescence properties.