Studies of nanoparticulate cadmium sulfide in amphiphilic polymaleic acid octadecanol ester Langmuir-Blodgett films

The reversed micelles of CdS nanoparticles capped with oligomer-polymaleic acid octadecanol ester (PMAO) were synthesized by a colloid chemical method in an aqueous system. The chemical ratio of PMAO between the carboxylic gr oup and the hydrocarbon chain was controlled to 1.5:1. The PMAO-capped CdS nanoparticles were transferred on to CaF2 and Si substrates by the Langmuir -Blodgett (LB) technique. Surface pressure-area isotherms indicated that PM AO-capped CdS nanoparticles could form a stable monolayer on the water subp hase. The measurement of FTIR and small angle X-ray diffraction showed that the reversed micelles of PMAO-capped CdS nanoparticles were formed with a uniform size and order in LB films. The photoluminescence properties of PMA O-capped CdS both in the solution and in the LB film indicated that the pho toluminescence peaks of reversed micelles obviously changed as a result of the energy transfer from PMAO to CdS and the interaction between clusters. (C) 1998 Elsevier Science Limited. All rights reserved.