Fabrication And Performance Investigation Of Porphyrin Micro And Nanometer Sized Crystals

Porphyrin compound widely exists in nature, and is involved in a number ofimportant reactions, such as oxygen transport, catalytic and photosynthesis in plants.The porphyrin is a heterocyclic macrocycle derived from four pyrroline subunitsinterconnected via their α-carbon atoms via methine bridges(=CH-). Porphyrin is thederivative of porphin (C20H14N4), where the hydrogen atoms are replaced by othersubstituent. The macrocycle is a highly-conjugated system with deep color. In nature,a lot of porphyrins exist in the form of liganding with metal ions, for example, hemeis iron porphyrin compound, chlorophyll is magnesium porphyrin compound, andvitamin B12is cobalt porphyrin compound. All above com pounds play an importantrole in the physiological function of organism, such as respiration and plantphotosynthesis. Furthuremore, porphyrin compound has the unique physical andchemical properties including excellent light and heat stability, strong absorption andemission in visible light area. Therefore, it has provoked the great interest of scientistsbecause they believe porphyrin plays an excellent even magical role in the energytransfer. Porphyrin compound is widely applied in biochemistry, analytical chemistry,materials science and so on. What’s more, they are as well widely used as informationstorage, optical sensing, molecular conductor and nonlinear optical materials in thefield of molecular electronics.In this paper, we prepared organic micro/nano structures of metal porphyrinmolecules (Mg, Ni, Cu, Pd) through a simple and low-cost solution process, andinvestigated their photoelectric response property and organic field effect performance.Experimental results obtained in this paper provided the basis for the relationshipbetween the structure and performance of porphyrin compound. This work wasmainly focused on the following three aspects:1. Fabrication and photoelectric performance investigation of chlorophyll a singlecrystalWe successfully prepared chlorophyll a single crystal by solution process: direct drop-coating and solvent exchange were used to prepare two different morphologiesof single crystals, resectively. We also analysed the formation mechanism in detail bythe characterization of SEM、SEAD、AFM and XRD. Meanwhile, we fabricated theoptical switch device based on chlorophyll a single crystal and characterized thephotoelectric properties.2. Fabrication and field effect performance investigation of Ni porphyrin micro-nanostructureMetal porphyrin as a kind of important macrocyclic compound has beenextensively investigated in chemistry, physics, biology, pharmacology, and moleculardevices for its easy to be synthetic and various properties.We chose diphenyl nickel porphyrin as the object, and fabricated two differentforms of the micro/nano structure by using the different solvents. Meanwhile, wefabricated the organic field effect transistors based on different Ni porphyrinmicro/nano structures, characterized their perfoamance, and analysed the relationshipbetween structures and properties.3. Fabrication and field effect performance investigation of different metalporphyrins micro-nano structureIn order to study the effects of different metals on field effect properties ofporphyrin compounds, we selectd Ni, Cu, Pd diphenyl porphyrin to fabricatemicro-nano structures, characterized the field effect performance, and analysed therelationship between structures and properties.