|About this Abstract
||Materials Science & Technology 2012
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Layer by Layer Assembly of SiO2/TiO2 Multilayers with Homo-/Heterogeneous Structures
||Zhenbo Xia, Kathy Lu
|On-Site Speaker (Planned)
Multi-layer films of nanoparticles on solid surfaces have been studied in order to obtain different structures. However, no method, including Langmuir-Blodgett technique and chemisorption and polymer adsorption, could provide a general solution for nanoparticle assembly. In this study, a new strategy is used to assemble nanoparticle-based films using a layer-by-layer approach, which is suitable for most oxides. Carboxylic and amino functionalized oxide nanoparticle suspensions are used as precursors. These surface functionalized particles can be covalently bonded with each other via amine coupling with the help of 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC)/n-hydroxysuccinimide (NHS). By controlling the assembly conditions and sequence precisely, SiO2/TiO2 multilayers with different combinations are assembled successfully on the silicon substrate. The particles are densely packed and the thin film is uniform. This method can be extended to other nanoparticles that have carboxylic and amino groups on the surface or those that can be modified to embody these functional groups.