Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties

Selvaraj Rengaraj, Selvaraj Venkataraj, Sun Hee Jee, Younghun Kim, Cheuk Wai Tai, Eveliina Repo, Arto Koistinen, Adriana Ferancova, Mika Sillanpää

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Cauliflower-like cadmium sulfide (CdS) microspheres composed of nanocrystals have been successfully synthesized by a hydrothermal method using poly(ethylene glycol) (PEG) as the template coordination agent and characterized by a variety of methods. Our experiments confirmed that the size of the CdS microspheres could be easily modified by controlling the chain length of PEG. Powder X-ray diffraction and Raman spectroscopy measurements revealed the cubic structure of the CdS microspheres; morphological studies performed by HR-SEM and HR-TEM methods showed the cauliflower-like structure of the synthesized CdS microspheres. Each microsphere was identified to be created by the self-assembly of CdS nanocrystals and is attributed to the oriented aggregation of the CdS nanocrystals around a polymer-Cd2+ complex spherical framework structure. X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray (EDX) analysis confirmed the stoichiometries of the CdS microspheres. Diffuse reflectance spectrum (DRS) measurements showed that increasing the PEG chain length increased the band gap value of the CdS microspheres slightly, from 1.99 to 2.06 eV. The cauliflower-like CdS microspheres could be applied to photocatalytic degradation studies.

Original languageEnglish
Pages (from-to)352-358
Number of pages7
JournalLangmuir
Volume27
Issue number1
DOIs
Publication statusPublished - Jan 4 2011

Fingerprint

Cadmium sulfide
cadmium sulfides
Microspheres
Nanocrystals
nanocrystals
Polyethylene glycols
Chain length
cadmium sulfide
x rays
Energy dispersive X ray analysis
Stoichiometry
X ray powder diffraction
Self assembly
Raman spectroscopy
self assembly
glycols
stoichiometry
Polymers
Energy gap
ethylene

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Rengaraj, S., Venkataraj, S., Jee, S. H., Kim, Y., Tai, C. W., Repo, E., ... Sillanpää, M. (2011). Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties. Langmuir, 27(1), 352-358. https://doi.org/10.1021/la1032288

Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties. / Rengaraj, Selvaraj; Venkataraj, Selvaraj; Jee, Sun Hee; Kim, Younghun; Tai, Cheuk Wai; Repo, Eveliina; Koistinen, Arto; Ferancova, Adriana; Sillanpää, Mika.

In: Langmuir, Vol. 27, No. 1, 04.01.2011, p. 352-358.

Research output: Contribution to journalArticle

Rengaraj, S, Venkataraj, S, Jee, SH, Kim, Y, Tai, CW, Repo, E, Koistinen, A, Ferancova, A & Sillanpää, M 2011, 'Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties', Langmuir, vol. 27, no. 1, pp. 352-358. https://doi.org/10.1021/la1032288
Rengaraj, Selvaraj ; Venkataraj, Selvaraj ; Jee, Sun Hee ; Kim, Younghun ; Tai, Cheuk Wai ; Repo, Eveliina ; Koistinen, Arto ; Ferancova, Adriana ; Sillanpää, Mika. / Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties. In: Langmuir. 2011 ; Vol. 27, No. 1. pp. 352-358.
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