637130 Sigma-Aldrich

Nickel(II) oxide

nanopowder, <50 nm particle size (TEM), 99.8% trace metals basis

Synonym: Nickel monooxide, Nickelous oxide



Related Categories 28: Ni, Magnetic Materials, Materials Science, Metal and Ceramic Science, Nanomaterials,
Quality Level   100
assay   99.8% trace metals basis
form   nanopowder
color   green to black
particle size   <50 nm (TEM)
density   6.67 g/mL at 25 °C (lit.)
bulk density   0.51 g/mL
Featured Industry   Battery Manufacturing
SMILES string   O=[Ni]
InChI   1S/Ni.O


General description

Nickel(II) oxide (NiO) is a metal oxide based nanomaterial with a good semiconducting property. Nanosized nickel oxide can be found in a variety of morphologies which include nanoflowers, spheres, wires, and tubes. It exhibits high performance in applications which require charge transfer and charge transport based processes. It can be prepared by a variety of physical and thermal methods such as sol-gel, hydrothermal and solvothermal techniques.


NiO can be used for a variety for energy and coating based applications such as lithium ion batteries, solar cells, electrochromic coatings, semiconducting films, and gas based sensors.


25, 100, 250 g in poly bottle

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Protocols & Articles


Advances in Materials for Solid Oxide Fuel Cells

As with all types of fuel cells, a Solid Oxide Fuel Cell (SOFC) is capable of efficiently transforming chemical energy into electrical energy. However, unlike fuel cells based on proton-conducting el...
Raymond J. Gorte
Material Matters Volume 5 Article 4
Keywords: Catalysis, Electrochemical reactions, Endothermic, Gene expression, Oxidations

Functional Magnetic Materials: Synergy Between Basic Science and Evolving Technology

S. B. Roy Materials and Advanced Accelerator Sciences Division Raja Ramanna Centre for Advanced Technology Indore-452013, India Email:
Keywords: Crystallization, Microscopy, Phase transitions, Reductions, transformation

Nanofluids for Biomedical Applications Using Spherical Iron Oxide Magnetic Nanoparticles Fabricated by High-Power Physical Evaporation

A. P. Safronov,1,2 I. V. Beketov,1,2 O. M. Samatov,1 G. V. Kurlyandskaya,2,3,* S. M. Bhagat,4 A. Larrañaga,5 I. Orue,5 R. Andrade5 1Institute of Electrophysics, RAS, Amundsen St. 106, 620016, Ekateri...
Keywords: Absorption, Condensations, Diffraction, Electronics, Evaporation, High performance liquid chromatography, Mass spectrometry, Melting, Microscopy, Oxidations, Potentiometric titrations, Scanning electron microscopy, Separation, Titrations, Transmission electron microscopy, X-Ray diffraction

Self-Propagating Reactions Induced by Mechanical Alloying

Mechanical alloying is a “brute force” method of affecting alloying and chemical reactions. The mixture of reactant powders and several balls are placed in the milling jar of a high-energy ball mill,...
Prof. Laszlo Takacs
Material Matters 2007, 2.4, 21.
Keywords: Ceramics, Chemical reactions, Combustion, Diffraction, Exothermic, Mass spectrometry, Metal Science, Oxidations, Reductions, Size-exclusion chromatography, Thermite, X-Ray diffraction, transformation

Soft Magnetic Nanocrystalline Alloys: Materials and Models

Victorino Franco Departamento de Física de la Materia Condensada, ICMSE-CSIC Universidad de Sevilla, P.O. Box 1065, 41080, Sevilla, Spain Email:
Victorino Franco
Material Matters, 2016, 11.4
Keywords: Addition reactions, Crystallization, High performance liquid chromatography, Mass spectrometry, Nucleic acid annealing, Precipitation, Spectroscopy, transformation

Peer-Reviewed Papers


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