화학공학소재연구정보센터
Thin Solid Films, Vol.598, 243-251, 2016
Growth and characteristics of PbS/polyvinyl alcohol nanocomposites for flexible high dielectric thin film applications
PbS/polyvinyl alcohol (PbS/PVA) nanocomposites have been grown by a chemical bath deposition process at various growth temperatures (60-100 degrees C). Transmission electronmicroscopy (TEM) study revealed the formation of PbS nanoparticles of diameter 6-20 nm encapsulated in PVA matrix. Optical band gap of the nanocomposite films have been found to decrease (1.45 eV-0.67 eV) with increase in growth temperature from 60 degrees C to 100 degrees C. The impedance measurements have been carried out by depositing the PbS/PVA films on indium tin oxide (ITO) coated flexible polyethylene terephthalate (PET) substrates. The room temperature dielectric permittivity and ac conductivity measurements have been carried out for ITO/PbS/PVA/Al devices deposited at various growth temperatures. The nanocomposite films demonstrate superior dielectric permittivity compare to pure PVA polymer. The flexibility studies of ITO/PbS/PVA/Al devices have been performed at different bending angles. (C) 2015 Elsevier B.V. All rights reserved.