The Research Of Photoinduced Charge Transfer Between Fullerene And ?-? Quantum Dots

Special cage structure of C₆₀ is highly symmetrical, three-dimensional conjugate ? electronic structure, throughout the ultraviolet visible light area, low reduction potential, a smaller restructuring energy in the process of electron transfer and its stability, Fullerene family has been widely used with the development of light-induced charge transfer properties of new optical materials. As fullerene derivatives PCBM not only has excellent properties of C₆₀, but also has good solubility, easy to be film, etc. One-dimensional C₆₀ nanomaterials not only has the structural characteristics of C₆₀ molecule, but has the linear characteristics of nanofibers. Quantum dots have unique physical properties, such as electronic structure dependence on size, large extinction coefficient and the multi-exciton generation etc, making it has advantage to become a photon receiver. In this paper, samples of PCBM-QD were prepared by spin-coating, the C₆₀ nanorods and C₆₀ nanorods modified by quantum dots were prepared by LLIP. The study for their morphology and optelectronic prorerties though TEM, UV-Vis, PL, SPS etc. This paper covers the following three aspects: 1. The performance study of PCBM and quantum dots composite materialsBy adjusting the concentration and speed of spincoating confirm the suitable film-forming condition of PCBM-CdSe/CdS/ZnS QDs, spincoating PCBM-QDs compounds with appropriate condition to prepare donor- receptor composite film. DFM results show the composite film is uniformity, SPV intensity of the composite film is higher than PCBM, and fluorescence quenching occur in the composite film, the photoluminescent quantum yield?PLQY? of QDs and composite film are 83.44%, 3.79%, quenching efficiency is 86.43% through transient fluorescenc spectrum. 2. The preparation and study photoelectric properties of C₆₀ nanorodsThe large length-diameter ratio of C₆₀ nanorods is prepared by the LLIP method, the distribution of the sample was uniform and no winding with each other. TEM indicate that C₆₀ nanorods section is hexagonal, and SEM and thermal analysis state that thermal stability of C₆₀ nanorods, AFM makes micro area electrical properties of C₆₀ nanorods clear, Raman spectrometer measured that Raman enhanced of C₆₀ nanorods with Au nanoparticals. 3. The preparation and study photoelectric properties of two kinds of quantum dots modified C₆₀ nanorodsThe large length-diameter ratio of quantum dots modified C₆₀ nanorods were prepared by LLIP method and in-situ growing method. C₆₀ nanorods modified by CdSe/CdS/ZnS quantum dots have the fcc structure. A lot of quantum dots clad on the C₆₀ nanorod with weak van der Waals force. UV-Vis spectra and fluorescence spectrum results indicate that strong fluorescence quenching phenomenon happened in quantum dots and C₆₀ nanorods interface has a greatly enhanced SPV signal compared to pure C₆₀. We can see photoelectric properties of different QDs comparing the Photoluminescent quantum yield?PLQY? and quenching efficiency through transient fluorescenc spectrum of different quantum dots of C₆₀ nanorods.