Controlled Morphology And Properties Research Of Porphyrin-based Nanostructure

The surfactant-assisted self-assembly behavior of meso-tetraphenyl porphyrin znicand its derivatives were investigated. Various self-assembled nanostructures can besynthesized, but also Porphyrin-based nanostructures have optical and electricalproperties significantly different from those of the monomeri porphyrins. A highlysensitive porphyrin-based array volatile organic compound (VOC) sensor had beendeveloped by using porphyrin nanomaterials. The sensor shows the advantages of fastreaction rate, high sensitivity and good reproducibility.Various self-assembled nanostructures of either nanosheets or nanorods can besynthesized, also the effects of different surfactants on the morphology ofnanoporphyrin have been studied. Various novel porphyrin-based nanostructures,including square nanoparticles, long strip nanoparticles, disc-shaped nanoparticles,quadrangular pyramidal nanoparticles, snow-like micron structures and bostrychoidnanoparticles were synthesized in this work. The organizations and shapes of porphyrinnanomatrials can be efficiently controlled by changing the surfactant, aging time, orfunctional group. Among these nanostructures, the rhombus nanoparticles were furtherorganized into a bostrychoid nanorods. The UV-vis spectra of porphyrin nanoparticleswas significantly different from that of the corresponding monomeri porphyrins. Soretbands were found to be broadened and split. The split soret bands in the UV-vis spectraof the porphyrins (ZnTPP, ZnTCPP, and ZnTPF20PP) indicated that the obtainedporphyrin-based nanostructure formed both types J-aggregation and H-aggregation. Thefluorescence intensity of porphyrin (ZnTPP, ZnTPF20PP, ZnTCPP and ZnTHPP)-basednanostructures was3.43,2.74,2.61and2.70times that of the corresponding monomericporphyrin solution, respectively.To improve the array respone, porphyrin nanostructure material was introducedinto the joining of array system. For vapor analysis, digital images of the array beforeand after exposure to a diluted vapor mixture were acquired by using an ordinaryscanner, and the changes in the red, green and blue values of each spot were measuredafter exposure to the benzene. Among the array fabricated with four porphyrinnanomaterials, only the one with ZnTPP nanomaterials owned the advantages of fastreaction rate, high sensitivity and good reproducibility for benzene detection. Insensitive measurement of the porphyrin nanostructured material,2.85fold of signal intensity was observed comparing to a color difference maps of the correspondingmonomeric porphyrin.