Fuzzy Assembly and Second Harmonic Generation of Clay/Polymer/Dye Monolayer Films

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• 作者：Bart van Duffel ; Thierry Verbiest ; Sven Van Elshocht ; André ; Persoons ; Frans C. De Schryver ; and Robert A. Schoonheydt
• 刊名：Langmuir
• 出版年：2001
• 出版时间：February 20, 2001
• 年：2001
• 卷：17
• 期：4
• 页码：1243 - 1249
• 全文大小：517K
• 年卷期：v.17,no.4(February 20, 2001)
• ISSN：1520-5827

文摘

Fuzzy assembled multicompound films consisting of natural and synthetic colloidal clay particles, poly(diallyldimethylammonium chloride) (PDDA) and the dyes methylene blue (MB⁺) and 4-{4-[N-allyl-N-methylamino]phenylazo}benzenesulfonic acid, sodium salt (NAMO^-) have been prepared. The organizationof the clay particles was imaged by means of atomic force microscopy. Fuzzy assembled glass/clay/methyleneblue films have been investigated by visible spectroscopy, and the spectra were explained in terms of thesubstrate-clay interaction and clay particle overlap. Glass/clay/PDDA/NAMO films were investigated bymeans of absorption spectroscopy, polarized absorption spectroscopy, and second harmonic generation.The nonlinear optical properties of the films were found to be determined by the adsorbed amount of NAMOand its noncentrosymmetric organization. These factors are in turn governed by the substrate type, thePDDA concentration, and the clay type. Optimized second harmonic generation for the glass/laponite/PDDA/NAMO films was found in which the clay particles are deposited onto a (3-aminopropyl)trimethoxysilane modified glass surface and PDDA chains are adsorbed from a 0.1 M solution.