Citation: . A SIMPLE METHOD FOR THE INCORPORATION OF LOW MOLECULAR WEIGHT DYES IN ULTRATHIN FILMS*[J]. Chinese Journal of Polymer Science, ;2003, 21(6): 631-637. shu

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

Received Date: 3 March 2003

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 on the selection of polyelectrolyte,the ionic strength and the pH of solution.An alternative approach is to first prepare conventional LBL films from a pair of oppositely charged polyelectrolytes,and then to soak this film into the chromophore solution,where adsorption by penetration into the LBL film may take place.In preliminary results,a linear dependence of UV 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.
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