Facile synthesis of thiol-stabilized CdSexTe1-x nanocrystals

R. Sathyamoorthy, P. Sudhagar, R. Saravana Kumar, P. Matheswaran, Ranjith G. Nair

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

CdSexTe1-x nanocrystals (x=0.25, 0.40, 0.50, 0.60 and 0.75) were synthesized using thioglycerol as a stabilizing agent. The composition of the CdSexTe1-x nanocrystals was precisely controlled by tuning the precursor (Se/Te) ratio. The structural, morphological and optical properties of the nanocrystals were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), diffused reflectance spectroscopy (DRS) and photoluminescence (PL) measurements. It is found that the Se/Te ratio significantly affects the properties of the resultant CdSexTe1-x nanocrystals. XRD pattern of the CdSexTe1-x nanocrystals revealed cubic, hexagonal and mixed phases depending on the ratio of Se:Te. Surface morphology of the CdSexTe1-x nanocrystals showed nanoclusters of sizes ∼50 nm, with the adjacent cluster interlinking each other. DRS revealed the size dependence band gap energy prevailing in the CdSe xTe1-x nanocrystals from 1.52 to 2.66 eV due to the optical bowing effect. PL measurements exhibited band edge emission in the visible spectral region, and are red shifted with increase in Se concentration. The facile route employed in the present work to synthesis the CdSe xTe1-x nanocrystals in an aqueous medium is simple and controllable, and the strategy presented will be handy in preparing diverse semiconducting nanocrystals.

Original languageEnglish
Pages (from-to)715-719
Number of pages5
JournalPhysica B: Condensed Matter
Volume406
Issue number4
DOIs
Publication statusPublished - 15 Feb 2011

Keywords

  • Nanocrystals
  • Optical bowing effect
  • Pseudo-binary alloy
  • Quantum confinement
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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