nanoparticle

https://doi.org/10.1351/goldbook.09538
Particle of any shape with an equivalent diameter of approximately 1 to 100 nm.
Note: nanoparticle photoresists are used in deep- and extreme-UV photolithography.
Source:
PAC, 2020, 92, 1861. (Terminology of polymers in advanced lithography (IUPAC Recommendations 2020)) on page 1881 [Terms] [Paper]