Silicon Holes Thick Walls Of Mesoporous Materials Preparation And Application

In 1992 the discovery of the new family of synthetic mesoporous silicates,known as M41S, by the Mobil scientists opened a new territory of research field inmaterials science. For the past ten years, such materials have attracted considerableattention in the areas such as separation of large molecular, biosensors, catalysis,adsorption, microelectronics, optics, and fabrication of novel nano-objects because oftheir high surface area, uniform and adjustable pore properties, rich surface functionalgroups, and designable morphologies. The successful synthesis of highly ordered,highly stable, hexagonal mesoporous silica SBA-15 materials by using commercialtriblock poly (ethylene oxide) -poly (propylene 9xide)-poly (ethylene oxide)(PEO-PPO-PEO) block copolymers' under acidic conditions opens up new possibilityin materials research.The current contribution concerns the synthesis of novel mesoporous materialswith small pore and thick wall, which templated by nonionic block copolymersurfactants. We have studied the synthesis of a highly ordered, hydrothermally stable,hexagonal mesoporous silica structures mesoporous silica structures by using P104and P123 as a structure-directi.ng agent. And we introduced a novel in situ method toincorporate CdS and ZnS into SBA-15 dexterously. Scanning electron microscopy(SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD), etc.were used to characterize the composite material. TEM images clearly confirmed theCdS or ZnS nanocrystals are located in the channels of SBA-15 with an average sizeof 4 nm. The mesoporous silica-supported composites showed blue shift in thephotoluminescence (PL) spectrum.