Growth of CdS nanocrystals of different size in polymeric matrix
F. Antolini, V. Rosetti, E. Burresi, S. Sangiorgi
ENEA (Italian National Agency for New Technology Energy and the Environment), IT
The nanocrystalline CdS formation starting from a single source precursor by thermal annealing was studied in organic/polymeric composite [1-4] and one of the main goal is to modulate the particle size to tune the nanocomposite properties. A metal-organic precursor of CdS was added to the polymeric matrix and then was subjected to different thermal treatments. The thermal treatments were carried out at different temperatures and time in order to evaluate the relationship between these two parameters in the nanocrystals size. The UV-VIS analysis shows the formation of the typical band absorption of CdS that shift from small to higher wavelength depending on the particle size. The XRD analysis also displays the formation of nanosized CdS crystals. A preliminary calculation of the size was carried out applying the Scherrer formula on the (111) and (220) reflections. Both techniques indicate that the temperature and the time of annealing are two crucial parameters which control the size of the CdS nanocrystals in the polymeric matrix. These key parameters are the crucial ones to implement the thermolytical synthesis for in situ nanocomposite formation by means of specific heat probes such as lasers .
Nanotech 2008 Conference Program Abstract