Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13998
Title: Preparation and evaluation of photoluminescent nanomaterials
Authors: GU CHUANWANG
Keywords: : Nanostructure, Titanium dioxide, Europium, MCM-41, SBA-15, Photoluminescence
Issue Date: 31-May-2004
Source: GU CHUANWANG (2004-05-31). Preparation and evaluation of photoluminescent nanomaterials. ScholarBank@NUS Repository.
Abstract: Mesoporous silica molecular sieves, MCM-41 and SBA-15, were synthesized under the templating of the supramolecular assembly of surfactant molecules. The synthesis strategy was also extended to prepare nanostructured TiO2 as photoluminescent materials. In this study, a sonochemical method was used to reduce preparation time. The room-temperature photoluminescence properties of the product before and after calcination were evaluated and discussed based on two mechanisms. MCM-41 and SBA-15 are ideal hosts for photoluminescent nanomaterials because of their uniform tunable pores, large surface area, and good stability. Further studies were conducted on synthesis of europium (Eu) doped MCM-41 and SBA-15 materials. The Eu-doped MCM-41 materials were prepared by co-condensation method, while the Eu-doped SBA-15 materials were achieved by ion exchange and physical adsorption by first passivation of the external surface of SBA-15 by phenyl groups. The photoluminescence properties of these materials were investigated and discussed.
URI: http://scholarbank.nus.edu.sg/handle/10635/13998
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