Effect of polyvinyl alcohol matrices on the structural and spectroscopic studies of CdSe nanoparticles

In this work, CdSe and polyvinyl alcohol (PVA)-capped CdSe nanoparticle were prepared using a one-step solution growth technique. The experimental results from transmission electron microscopy showed that the nanoparticles were well dispersed and uniform in shape with diameter of about 95 and 25 run for CdSe and PVA-capped CdSe, respectively. X-ray diffraction results showed that, the crystallinity of PVA largely decreased after capping with CdSe. The infrared absorption spectra were measured in the range (4000-200cm(-1)). The shift of the OH band toward higher frequency indicates the degradation of the hydrogen bond between the polymer chains. The change of the intensity of the carbonyl stretch band at 1700cm(-1) indicates the electrostatic interaction between CdSe and the oxygen of carbonyl group. The optical band gap was calculated from the electronic spectra and correlated with the particle size of the capped CdSe. (c) 2007 Elsevier B.V. All rights reserved.