Editorial Feature

Cobalt Oxide (Co3O4) Nanoparticles - Properties, Applications

The potential for nanoparticles to be used in biological, chemical, and industrial areas is infinite. Researchers are working on new applications constantly.

This article discusses the properties and applications of cobalt oxide nanoparticles. Cobalt is a Block D, Period 4 element, while oxygen is a Block P, Period 2 element. Cobalt can be found in cobaltite, erythrite, glaucodot and skutterudite ores.

Cobalt oxide nanoparticles appear as a white powder with spinel crystal structure. They are an important magnetic material, and are P-type semiconductors. When nano-cobalt oxide is exposed to the hydrogen flame and heated to 900°C (1652°F), it changes into metal cobalt.

Cobalt oxide nanoparticles are graded as harmful to humans and dangerous for the environment. They can be harmful if swallowed, and cause allergic skin reactions. They are also very toxic to aquatic life with long lasting effects.

Chemical Properties

The chemical properties of cobalt oxide nanoparticles are outlined in the following table.

Chemical Data
Chemical symbol Co3O4
CAS No. 1308-06-1
Group Cobalt 9
Oxygen 16
Electronic configuration Cobalt [Ar] 3d7 4s2
Oxygen [He] 2s2 2p4
Chemical Composition
Element Content (%)
Cobalt 73,42
Oxygen 26.57

Physical Properties

The physical properties of cobalt oxide nanoparticles are given in the following table.

Properties Metric Imperial
Density 6.11 g/cm3 0.220 lb/in3
Molar mass 74.93 g/mol -

Thermal Properties

The thermal properties of cobalt oxide nanoparticles are provided in the table below.

Properties Metric Imperial
Melting point 895°C 1643°F
Boiling point 900°C 1652°F

Manufacturing Process

Cobalt oxide nanoparticles can be manufactured by a homogeneous precipitation method using various synthetic conditions. The cobalt oxide nanoparticles formed via thermal decomposition of the cobalt hydroxides in air at 350°C (662°F). Cobalt oxide nanoparticles can then be characterized by a variety of analytical techniques.


The key applications of cobalt oxide nanoparticles are as follows:

  • In micro-electronics
  • As a magnetic nanoparticles with numerous uses in microbatteries, nanowires, and specific alloy and catalyst applications
  • In catalysis, superconductors, electronic ceramics and other fields as an important inorganic material
  • As catalyst and catalyst carriers
  • As an electrode active materials
  • For glass, porcelain colorants and pigments
  • Chemical industry oxidants
  • Senior goggles and other filter materials
  • As carbides
  • In temperature and gas sensors
  • In electrochromic devices
  • In enamels, grinding wheels, and solar energy absorbers

Source: AZoNano


  1. Syam Sundar Syam Sundar Portugal says:

    what about the thermal conductivity and specific heat of the Co3O4 nanoparticles.

    • Suleiman Akilu Suleiman Akilu Malaysia says:

      Dear Dr. Sundar, have you found the properties of cobalt oxide nanoparticles? Can you pls share the information. Thank you in advance

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoNano.com.

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