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Gamma-radiolysis-assisted cobalt oxide nanoparticle formation.

L M Alrehaily¹, J M Joseph, M C Biesinger

¹Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7.

Physical Chemistry Chemical Physics : PCCP

|December 11, 2012

Summary

Gamma irradiation of cobalt sulfate solutions at high pH produced cobalt oxide (Co(3)O(4)) nanoparticles. This study details the formation mechanism and characteristics of these novel nanomaterials.

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Area of Science:

Materials Science
Radiochemistry
Nanotechnology

Background:

Cobalt sulfate (CoSO(4)) solutions are precursors for nanomaterial synthesis.
Gamma irradiation is a method for inducing chemical transformations and particle formation.
Understanding radiolytic processes is crucial for developing new synthetic routes.

Purpose of the Study:

To investigate the formation of cobalt oxide (Co(3)O(4)) nano-scale colloid particles.
To elucidate the mechanism of particle formation via gamma irradiation of CoSO(4) solutions.
To characterize the synthesized Co(3)O(4) nanoparticles.

Main Methods:

Irradiation of CoSO(4) solutions at different pH levels and conditions (air-saturated, Ar-purged).
Measurement of radiolytic products (H(2), H(2)O(2), Co(II), Co(III)) and particle properties.

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Characterization of particle composition and size using X-ray photoelectron spectroscopy (XPS), Raman, UV-Vis spectroscopy, and transmission electron microscopy (TEM).

Main Results:

Particle formation occurred only in air-saturated CoSO(4) solutions at pH 10.6.
Particles evolved from cobalt hydroxide (Co(OH)(2)) to cobalt oxyhydroxide (CoOOH) and finally to Co(3)O(4).
Final Co(3)O(4) nanoparticles were uniform in size (8-20 nm) and confirmed by spectroscopic analysis.

Conclusions:

A mechanism for Co(3)O(4) nanoparticle formation is proposed, driven by the low solubility of Co(OH)(2) at high pH.
Radiolytic oxidation of Co(II) to Co(III) is a key step in the process.
The findings offer insights into the radiolytic synthesis of metal oxide nanoparticles.