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pH-Dependent shape changes of water-soluble CdS nanoparticles

  • An-Qi Zhang
  • Qing-Zhe Tan
  • Hui-Jun Li
  • Li Sui
  • Dong-Jin Qian
  • Meng Chen
Research Paper

Abstract

In this study, a one-pot route was illustrated to synthesize stable water-soluble CdS nanoparticles stabilized by poly-(4-styrenesulfonic acid-co-maleic acid) (PSSMA). The CdS nanoparticles synthesized in alkaline solutions (pH 10.0) were irregular and small in size (~1.1 nm), while those generated in acid solutions (pH 4.5) tended to aggregate to form larger particles (~74.5 nm). Some bridge-like CdS wires linking several CdS particles were observed by tuning the molar ratio of elemental Cd to S. The ligand-detachment mechanism has been proposed to be the main reason for the formation of CdS assemblies synthesized in acid solutions. Further, photoluminescence (PL) studies confirmed that the use of the PSSMA stabilizer induces incomplete quenching of PL emissions in an acid solution, but complete quenching in an alkaline solution.

Keywords

Cadmium sulfide nanoparticles Irreversible aggregation Ligand-detachment mechanism Emission quenching Semiconductor 

Notes

Acknowledgments

Financial supports from the National Science Foundation of China (20871031, 51073039, 11179015, and 51173108), Innovation Program of Shanghai Municipal Education Commission (12ZZ143), and Hui-Chun Chin and Tsung-Dao Lee Chinese Undergraduate Research Endowment (CURE) are gratefully acknowledged.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • An-Qi Zhang
    • 2
  • Qing-Zhe Tan
    • 1
  • Hui-Jun Li
    • 1
  • Li Sui
    • 3
  • Dong-Jin Qian
    • 1
  • Meng Chen
    • 1
  1. 1.Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials LaboratoryFudan UniversityShanghaiPeople’s Republic of China
  2. 2.Department of Materials ScienceFudan UniversityShanghaiPeople’s Republic of China
  3. 3.School of Medical Instrument and Food EngineeringUniversity of Shanghai for Science and TechnologyShanghaiPeople’s Republic of China

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