Aqueous synthesis and characterization of nearly monodispersed ZnS nanocrystals

✍ Scribed by Azizian-Kalandaragh, Yashar ;Khodayari, Ali

• Book ID: 105365592
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 492 KB
• Volume: 207
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200925484

✦ Synopsis

Abstract

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.