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Sigma-Aldrich offers a wide selection of research-grade inorganic nanoparticles with compositions spanning most of the Periodic Table. Compositionally, nanoparticles are separated into two broad classes: metals and metal alloys, and ceramic nanoparticles. Available ceramic nanoparticles include oxides (including complex and doped compositions), nitrides, carbides, and other ceramics, such as carbon and diamond nanopowders. Our nanoparticles are offered as nanopowders, dispersions, and solutions of surface-functionalized particles.
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Product Number |
Description |
Attributes |
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684007 |
Copper nanopowder |
< 50 nm (TEM) |
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686468 |
Palladium nanopowder |
< 25 nm (TEM) |
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687863 |
Monodisperse gold nanoparticles |
PEG-functionalized, 2% (w/v) in H2O |
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694169 |
Monodisperse gold nanoparticles |
PEG-functionalized, 2% (w/v) in ethanol |
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685453 |
Platinum Nanopowder |
< 50 nm (BET) |
Technical Notes:
Read recent article about unique properties and novel applications of nanoparticles in Material
Matters Vol. 2 No. 1 (2.2 Mb PDF) |
The size of nanomaterials.
Unless otherwise noted, the size indicated is measured by BET analysis and represents the average spherical particle size. For a review of nanoparticle size determination methods see "The Big Problem of Small Particles: A Comparison of Methods for Determination of Particle Size in Nanocrystalline Anatase Powders" (Weibel, A. et al. Chem. Mater. 2005, 17, 2378).
Nanopowders vs. Nanoparticle Dispersions and Nanoparticle Solutions.
Nanopowders are solid powders of nanoparticles, often containing micron-sized nanoparticle agglomerates. These agglomerates can be redispersed using, for example, ultrasonic processing. Nanoparticle dispersions are suspensions of nanoparticles in water or organic solvents. These dispersions can be used as-is, or diluted with suitable (compatible) solvents. Nanoaprticles in dispersions can sometimes settle upon storage, in which case they can be mixed before use. Some surface-functionalized nanoparticles (for example silver and gold) are available as solutions in water or organic solvents. These are “true” solutions, which should not settle or phases separate if properly stored
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