文献类型：期刊文献

英文题名：Fabrication and properties of porphyrin nano- and micro-particles with novel morphology

作者：Li, Xiangqing[1];Zhang, Line[1];Mu, Jin[1];Qiu, Jinlong[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Ultrafine Mat, Dept Chem, Shanghai 200237, Peoples R China

年份：2008

卷号：3

期号：5

起止页码：169

外文期刊名：NANOSCALE RESEARCH LETTERS

收录：;EI(收录号：20082411306765);WOS:【SCI-EXPANDED(收录号:WOS:000257381500001)】；

语种：英文

外文关键词：porphyrins; self-assembly; heteroaggregates; morphology; properties

摘要：New types of porphyrin nano- and micro-particles composed of J- and H-heteroaggregates were prepared by electrostatic self-assembly of two oppositely charged porphyrins, tetrakis(4-trimethylammoniophenyl) porphyrin (H(2)TAPP(4+)) and tetrakis(4-sulfonatophenyl) porphyrin cobalt (II) (CoTPPS4-), in aqueous solutions. Transmission electron microscopy (TEM) images showed novel morphology and size distribution of porphyrin particles fabricated under different experimental conditions. The assembly process of the nano- and micro-particles was monitored by UV-Vis spectra. Fluorescence spectra and UV-Vis spectra provided optical information on the formation of the nano- and micro-particles. Cyclic voltammograms of the porphyrin particles indicated that the electron gain and loss of the H(2)TAPP(4+) ion were restrained, and the electron transfer of the CoTPPS4- ion was promoted in the J- and H-type porphyrin heteroaggregates within the particles. The stability and constitution of the nano- and micro-particles were confirmed by UV-light irradiation, heat-treatment, and pH and ionic strength changes. Photo-electrochemical measurements showed that the photoelectron transfer of TiO2 modified with the particles was more efficient than that of TiO2 sensitized by either monomers. The photo-electronic and photocatalytic properties of the products indicated that the pyramidal or spherical configuration of the nano- and micro-particles was favorable for the absorption and transfer of the energy. It can be found that TiO2 sensitized by the porphyrin nano- and micro-particles exhibits significant improvement in energy conversion and photocatalytic activity with reference to pure TiO2.