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

doi:10.1021/la1032288

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

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

95 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 language	English
Pages (from-to)	352-358
Number of pages	7
Journal	Langmuir
Volume	27
Issue number	1
DOIs	https://doi.org/10.1021/la1032288
Publication status	Published - Jan 4 2011

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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title = "Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties",

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.",

author = "Selvaraj Rengaraj and Selvaraj Venkataraj and Jee, {Sun Hee} and Younghun Kim and Tai, {Cheuk Wai} and Eveliina Repo and Arto Koistinen and Adriana Ferancova and Mika Sillanp{\"a}{\"a}",

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AU - Tai, Cheuk Wai

AU - Repo, Eveliina

AU - Koistinen, Arto

AU - Ferancova, Adriana

AU - Sillanpää, Mika

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

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