Surfactant-assisted hydrothermal synthesis of CdS nanotips: Optical and magnetic properties

Biswajit Mondal, Shyamal Kumar Saha

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

CdS nanotips with size 5-8 nm are synthesized by hydrothermal process using polyacrylamide (PAM) as surfactant. The shape of nanocrystals (NCs) changes from particles to nanorods or nanotips depending upon the amount of PAM used. Optical properties of the CdS NCs vary with hydrothermal temperature (T H) due to formation of "S" vacancies. The Rietveld refinement of XRD data shows that "S" site occupancy decreases with increase in T H and amount of PAM indicating the formation of "S" vacancies. Size-dependent magnetic properties in these NCs indicate that the micron-size rods are diamagnetic in nature while the microrods ended with sharp tips show ferromagnetism even at room temperature. The origin of this ferromagnetism in nanotips is explained by the variation in density of "S" defects at the nanotips as well as in the nanorods. These ferromagnetic nanotips grown in the rods as side growth have potential applications in magnetic force microscopes.

Original languageEnglish
Article number1049
JournalJournal of Nanoparticle Research
Volume14
Issue number8
DOIs
StatePublished - 1 Aug 2012
Externally publishedYes

Keywords

  • Ferromagnetism
  • Hydrothermal
  • Nanotips
  • Photoluminescence
  • Polymer as surfactant
  • Room temperature

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • General Chemistry
  • Modeling and Simulation
  • General Materials Science
  • Condensed Matter Physics

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