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Preparation and Properties Research of New Type Nano-Porphyrin

Author: LiuZuo
Tutor: HouChangJun
School: Chongqing University
Course: Biomedical Engineering
Keywords: porphyrins nano-materials Density Functional Theory (DFT) optical properties sensing and detection
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 52
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Abstract


Characteristics of three kinds of porphyrin are studied by Density Functional Theory(DFT). Their application value in detection is also be predicted. Nanoparticles of two kinds of porphyrin with excellent properties have been prepared in experiments based on monomers of two kinds of porphyrin. The two nano-materials can both detect dimethyl methyl phosphonate(DMMP, a stimulant of nerve agent S1)rapidly and sensitively, and their sensing properties are consistent with theoretical prediction. The results lays a foundation for screening relevant sensitive materials by theoretical prediction and detecting target material in the future.In this study, self-assembling principle and mixed-solvent method are firstly used in preparing 5,10,15,20-tetraphenylporphyrin manganese (MnTPP) nanoparticles and 5,10,15,20-tetraphenylporphyrin indium(InTPP) nanoparticles. The UV-Vis spectra of them are both having some similar characteristic changes: the absorbance of Soret belt reduces, moreover, the Soret belt redshifts and becomes wider. The scale and morphology of nano-MnTPP and nano-InTPP prepared in different conditions are characterized by FE-SEM. The results indicate the best temperature of preparation of them is both 50℃, and the best drying condition of them is both natural volatilization.UV-Vis technology is used for studying detection effect of nano-MnTPP and nano-InTPP to DMMP. The results indicate that sensitivity of nano-MnTPP is 1.4 times than MnTPP monomer, and the detection limit to DMMP of nano-MnTPP is lower than MnTPP monomer three orders of magnitude; the sensitivity of nano-InTPP is 1.8 times than InTPP monomer, and the detection limit to DMMP of nano-MnTPP is lower than MnTPP monomer three orders of magnitude too. Detection effects to DMMP of InTPP monomer and InTPP nanoparticles are better than MnTPP monomer and MnTPP nanoparticles respectively. This result is consistent with prediction by Density Functional Theory. It also prove the feasibility of method: rapidly screening sensitive materials based on Density Functional Theory. This provides a new idea in screening sensitive materials in the future.

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