2ND-HARMONIC GENERATION FROM LANGMUIR-BLODGETT MULTILAYERS ASSEMBLED FROM ACTIVE NON-POLYMERIC AMPHIPHILES AND INACTIVE POLYMERIC AMPHIPHILES

Citation
D. Dunne et al., 2ND-HARMONIC GENERATION FROM LANGMUIR-BLODGETT MULTILAYERS ASSEMBLED FROM ACTIVE NON-POLYMERIC AMPHIPHILES AND INACTIVE POLYMERIC AMPHIPHILES, Journal of materials chemistry, 8(6), 1998, pp. 1391-1397
Citations number
36
Categorie Soggetti
Chemistry Physical","Material Science
ISSN journal
09599428
Volume
8
Issue
6
Year of publication
1998
Pages
1391 - 1397
Database
ISI
SICI code
0959-9428(1998)8:6<1391:2GFLMA>2.0.ZU;2-A
Abstract
Alternating Langmuir-Blodgett (LB) multilayers have been prepared from a non-polymeric hemicyanine and a poly(4-vinylpyridine) 66% quaternis ed with docosyl bromide, and from a non-polymeric azobenzene and the s ame pyridinium polymer. With both types of multilayer the intensity of the SHG signal increased as the square of the number of layers up to a thickness of ca. 60 bilayers. The slopes of the plots correspond to second order susceptibilities of 17.5 and 9 pm V-1 respectively,Althou gh these properties and the stabilities of the films over time compare favourably with many other LB films described in the literature, thes e films prepared from 'active' non-polymeric amphiphiles and a 'passiv e' polymeric amphiphile are not as satisfactory as the closely related all-polymeric films described previously.