文献类型：会议论文

英文题名：Mesoporous Silica Spheres as Microreactors for Performing CdS Nanocrystal Synthesis

作者：Li, Yaoxia[1];Zhu, Yihua[1];Yang, Xiaoling[1];Li, Chunzhong[1]

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

会议论文集：12th International Conference on Crystalization of Biological Macromolecules

会议日期：MAY 06-08, 2008

会议地点：Cancun, MEXICO

语种：英文

摘要：CdS nanoparticles were exclusively synthesized in the pores of mesoporous silica (MS) particles that had been coated with two bilayers of poly(allylamine hydrochloride) (PAH)/poly(styrene sulfonate) (PSS) via the layer-by-layer (LbL) self-assembly technique. The PAH/PSS multilyers film could prevent generation of nanocrystals outside the MS spheres. After removal of the silica cores, US nanocrystal encapsulated microcapsules were obtained confirming that numerous US nanocrystals were successfully formed. The sizes of the US nanocrystals were mainly determined by the pore size of the MS spheres. After being treated with a mixed solution of three salts including NaCl, LiCl, and KNO3, the MS spheres showed two different pore sizes of 3.2 and 9.7 nm. Thus, two differently sized (3.2 nm, 6.8 nm) US nanocrystals were formed in the pores of MS spheres. This result is believed to explain the photoluminescence (PL) band originating from hand-to-hand transition. Measurements and analysis of X-ray diffraction, transmission electron microscopy, high-resolution TEM, photoluminescence spectra and confocal laser scanning microscopy showed that the US nanocrystals were almost perfectly inserted into the pores of the MS spheres and had good crystallinity, which created a fluorescence emission. This approach can be used to prepare composite materials involving functional inorganic natioparticles, which have potential application in biological immunoassay and photoelectronic fields.