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Aqueous synthesis and characterization of nearly monodispersed ZnS nanocrystals
Author(s) -
AzizianKalandaragh Yashar,
Khodayari Ali
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925484
Subject(s) - nanoclusters , aqueous solution , zinc sulfide , band gap , materials science , nanoparticle , stoichiometry , nanocrystal , reagent , zinc , quantum dot , chemical engineering , analytical chemistry (journal) , nanotechnology , chemistry , organic chemistry , metallurgy , engineering , optoelectronics
An ultrasound‐assisted solution‐phase process has been applied for the aqueous synthesis of zinc sulfide nanocrystals in the presence of 3‐mercaptopropionic acid (3‐MPA) as a capping agent. The synthesis procedure was carried out by using two reagents: zinc chloride and sodium sulfide. Spherical shaped nanoparticles were agglomerated in the form of nanoclusters were observed. Obtained crystalline materials were found without the need of a post‐synthesis treatment. The preparative conditions such as precursor concentrations, pH, and washing materials were optimized. The average crystalline size of ZnS nanostructures has been analyzed by X‐ray diffraction (XRD) pattern and estimated to be 4.7 nm. The energy dispersive X‐ray analysis (EDAX) reveals the average atomic percentage of Zn/S was 50:50, showing that the preparation is exactly stoichiometric. Optical measurements indicate a direct band gap of about 4.27 eV. There was observed a blue shift of about 0.57 eV, in comparison to its bulk value due to quantum confinement effects of electrons and holes.