| In recent years, the idea of nanometer has been permeated into many fields such as mechanics , pharmacology, biology, physics, chemistry, electronics, mechanics, materials science, and so on. Porous alumina has typical self-organization structure. The dimension of pores is almost unanimous all over the membranes. The size and depth of pores can change according to preparation conditions such as voltage, anodic time, et al. Porous alumina with its special nanometer structure pioneered a new way for the development of new- style function material. Many scientists used it as template or carrier and implanted organic dyes and other inorganic materials in it to study its properties.Because of its unique character, many people focused their attention on researching porous alumina. In this paper, C102 and RH6G were embedded in porous alumina and the photoluminescence prosperities of the complexes were studied.In the first chapter, the ideal structure of porous alumina was given. In order to get more knowledge about porous alumina, the effect of preparation conditions was chiefly discussed. At the end of this chapter, its application in many fields was also argued.The second chapter was about the preparation of porous alumina. Both the method and the process of preparation were narrated. From the surface and inter-cross pattern, some information about porous alumina can be gained. At last, the merit of porous alumina as carrier was also discussed and it can be said that porous alumina was a kind of good carrier.The third chapter was about the luminescence of porous aluminia withorganic dye inlayed in it. Three portions were discussed in this chapter. One is about the luminescence of RH6G in porous alumina, the other two are about the PL of C102 and RH6G in ethanol solution and -in porous alumina respectively.The waveforms of PL spectra were similar before and after rinsing, but the PL spectrum after rinsing was blue shift comparing to the spectrum before rinsing.- It can be concluded that RH6G existed indeed in it, because porous alumina wasn't luminescence in this waveband. Spectra shift in three states were correlated with conglomeration degree of dye molecules. In embedded films, dye mainly existed in the state of monomer, while the powder of dye was dimmer even polymer; at the same time, it was found that the full width at half-maximum (FWHM) was also different in three different states.To study the fluorescence spectra of dye in porous alumina, the luminescence of C102 and RH6G in ethanol solution was investigated. In the experiment, C102 was donor and RH6G was acceptor. Firstly, it was approved by two methods that if C102 and RH6G were mixed together, the fluorescence spectrum would be wider than that of C102 or RH6G. One proof was that the fluorescence spectrum of C102 and the absorption spectrum of RH6G were overlapped in a certain range. It was another evidence that the peak wavelength of RH6G fluorescence spectrum was almost equal to that of C102 excitation spectrum. Secondly, the fluorescence spectra of C102 and RH6G in different concentration ethanol solution were studied. It was found that some of donor absorbed the exciting light to make itself luminescent, while other of it delivered parts of its energy to acceptor and made it fluorescent. With the increasing of acceptor concentration, fluorescence intensity of the donor turned weak, while that of the acceptor was enhanced. All these suggested that energy transfer existed between donor and acceptor. The enhancement of acceptorPL intensity was at the cost of the weakening of donor PL intensity. Donor strengthened the efficiency of energy transfer while the concentration of acceptor increased.At the end of this paper, the PL spectra of C 102 and RH6G in ethanol solution were studied. By comparison, it was found that the changes of the fluorescence spectra were almost uniform either in embedded film or in ethanol solution. In embedded film the valley was shallower than in ethanol solution. The spectrum range of two dye...
|
PDF Full Text Request