A SIMPLE METHOD FOR THE INCORPORATION OF LOW MOLECULAR WEIGHT DYES IN ULTRATHIN FILMS  

作　　者：C. Geraldine Bazuin Carmen M. Tibirna 

机构地区：[1]Centre de Recherche en Sciences et Ingenierie des Macromolecules (CERSIM),Departement de Chimie, Universite Laval, Qudbec (QC). Canada GIK 7P4 Departement de chimie, Universite de Montreal, C.P. 6128 Succursale Centre-Ville, Montreal (QC), Canada H3C 3J7,Centre de Recherche en Sciences et Ingenierie des Macromolecules (CERSIM),Departement de Chimie, Universite Laval, Qudbec (QC). Canada GIK 7P4

出　　处：《Chinese Journal of Polymer Science》2003年第6期631-637,共7页高分子科学（英文版）

基　　金：The financial support of NSERC (Canada) and FCAR (Quebec) is gratefully acknowledged.

摘　　要：A simple method for the fabrication of ultrathin films containing low molecular weight dye material is introduced(post-adsorption technique). The chromophore used is 4-nitro-4'-decyloxy azobenzene quaternary ammonium salt (azo-10Q).In classical layer-by-layer (LBL) procedures, where the substrate is dipped alternately into the chromophore solution and thecomplementary polyelectrolyte, the chromophore tends to desorb from the film during subsequent immersion in thepolyanion solution, and there is little or no indication of multilayer growth. The extent of desorption depends somewhat onthe selection of polyelectrolyte, the ionic strength and the pH of solution. An alternative approach is to first prepareconventional LBL films from a pair of oppositely charged polyelectrolytes, and then to soak this film into the chromophoresolution, where adsorption by penetration into the LBL film may take place. In preliminary results, a linear dependence ofUV absorbance on layer number of LBL film thus prepared was found, demonstrating the apparent effectiveness of the post-adsorption technique for the preparation of azo-10Q-containing ultrathin films.A simple method for the fabrication of ultrathin films containing low molecular weight dye material is introduced(post-adsorption technique). The chromophore used is 4-nitro-4'-decyloxy azobenzene quaternary ammonium salt (azo-10Q).In classical layer-by-layer (LBL) procedures, where the substrate is dipped alternately into the chromophore solution and thecomplementary polyelectrolyte, the chromophore tends to desorb from the film during subsequent immersion in thepolyanion solution, and there is little or no indication of multilayer growth. The extent of desorption depends somewhat onthe selection of polyelectrolyte, the ionic strength and the pH of solution. An alternative approach is to first prepareconventional LBL films from a pair of oppositely charged polyelectrolytes, and then to soak this film into the chromophoresolution, where adsorption by penetration into the LBL film may take place. In preliminary results, a linear dependence ofUV absorbance on layer number of LBL film thus prepared was found, demonstrating the apparent effectiveness of the post-adsorption technique for the preparation of azo-10Q-containing ultrathin films.

关 键 词：Ultrathin films Layer-by-layer Azo derivatives Polyelectrolytes Supramolecular complexes 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]