Encapsulation of aluminum tetrasulfophthalocyanine chloride in silica xerogel and its optical properties

摘要

Metallophthalocyanines (MPc) exhibit, among many useful properties, the ability to protect sensors against short intense pulse that is deleterious to efficient sensor operation. For the successful application of this optical limiting property, an important issue is the incorporation of MPc molecules in a matrix to fabricate a solid-state system. We report here the study of different concentrations of aluminum tetrasulfophthalocyanine chloride (AlTSPcCl) encapsulated in silica xerogel matrix obtained by sol-gel technique. The resulting composites were transparent and homogeneous with appropriate optical quality. The trapping effect was checked by the characteristic absorption bands of NiTSPc in the UV/Vis spectra. The optical limiting properties of the composites were measured at 532 nm with 8-ns pulses.