Zeta poten is s udy of Bismuth Sulfide Nanorods With Different Surfactants

We report here the zeta potential study of Bi2S3 nanoparticles (NPs), synthesized by facile polyol method using CTAB and EDTA as surfactants or capping agents. X-ray diffraction (XRD), Kietveld refinement of XRD data and Raman spectroscopy confirms the single phase orthorhombic crystal structure of Bi2S3 with space group Pnina. In Energy dispersive X-ray spectroscopy (EDAX) data ratio of Bi to S was little deviated from 2:3 due to excess sulfur taken during synthesis. Field Emission Scanning Electron Microscope (FESEM) images show the agglomeration of rod -like Bi2S3. Effect of different capping agents on the surface charge of Bi2S3 NPs was studied using Zeta potential measurement with ethanol as dispersion medium at different pH values. It reveals that these NPs are more stable when it was synthesized in presence of EDTA than that of CTAB or without capping agent. The isoelectronic point was found at pH! = 4.2 for pure sample and 3.2 and 7.3 for CTAB and EDTA capped Bi2S3 samples.