T. Schneider et al., SYNTHESIS AND CHARACTERIZATION OF PBS NANOPARTICLES IN BLOCK-COPOLYMER MICELLES, Berichte der Bunsengesellschaft fur Physikalische Chemie, 101(11), 1997, pp. 1654-1656
Citations number
14
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
Precipitation of lead ions by hydrogen sulfide in the presence of amph
iphilic block copolymer micelles composed of polystyrene-b-poly(4)viny
lpyridine yields PbS nanoparticles. By adjusting the reaction conditio
ns with respect to the lead-to-polymer ratio, temperature or proton co
ncentration particles of different size (2 to 20 nm) and morphology (s
pheres, cubes or needles) have been prepared. These particles have bee
n characterized by powder X-ray diffraction and High Resolution Transm
ission Electron Microscopy (HRTEM). At a low lead content of the polym
er micelles and elevated temperatures the formation of nanocrystalline
PbS needles is preferred. These exhibit a structured absorption spect
rum with two peaks at 375 and 580 nm. In polymer micelles with high le
ad content, PbS spheres (1 to 2 nm) are formed. Growth of these partic
les can be induced by increasing the proton concentration, resulting i
n particles with diameters up to 20 nm.