| Abstract
| - Lead sulfide nanocrystals (NCs) along with nanothreads and nanosheets were synthesized in the presence ofwater soluble polymers such as poly(styrene sulfonate) sodium salt (PSS) and poly(vinyl pyrolidone) (PVP)in aqueous phases at relatively mild temperature of 80 °C. The amount of each polyelectrolyte wassystematically varied between 1 and 4 mM (monomolar based). The presence of PSS produced roughly cubicgeometries at low concentrations, while nanothreads and nanosheets were produced at high concentrations.This was not so in the presence of equivalent amounts of PVP, where only fine cubes and nanobars wereobtained. The shape and structure of all kinds of geometries were characterized by TEM, FESEM, EDX, andXRD analyses. All results demonstrated that the different preferential adsorption of polyelectrolyte PSS andneutral PVP for different crystal planes of the fcc geometry of PbS controlled the final morphology.
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