Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Fabrication and Properties of Porphyrin Nano- and Microparticles with Novel Morphology | Nanoscale Res Lett 2008 3 169-178 DOI s11671-008-9132-6 NANO EXPRESS Fabrication and Properties of Porphyrin Nano- and Microparticles with Novel Morphology Xiangqing Li Line Zhang Jin Mu Jinlong Qiu Received 28 October 2007 Accepted 5 May 2008 Published online 21 May 2008 to the authors 2008 Abstract New types of porphyrin nano- and microparticles composed of J- and H-heteroaggregates were prepared by electrostatic self-assembly of two oppositely charged porphyrins tetrakis 4-trimethylammoniophenyl porphyrin H2TAPP4 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 H2TAPP4 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. Photoelectrochemical 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 X. Li L. Zhang J. Mu El J. Qiu Department of Chemistry Key Laboratory for Ultrafine Materials of Ministry of .
