Since 2004, nanoComposix has provided monodisperse and unagglomerated metal and metal-oxide nanomaterials to thousands of customers. Hundreds of different variants of material, size, shape, and surface are available as stock products and we have produced over 2000 custom core/shell, biofunctionalized, fluorescent, and magnetic nanocomposites to meet client specifications. nanoComposix produced the NIST nanosilver reference material and our particles have been utilized in over 2000 peer-reviewed publications. All of our materials are supplied with certificates of analysis that include electron microscopy, hydrodynamic diameter, and optical data for each batch to guarantee products meet specifications.