Although copper nanoparticles are used as model nanomaterial because of their small nucleation barrier, their oxidization sensitivity hampers production of fully metallic nanoparticles with controlled size and shape. Nevertheless, we demonstrate here synthesis of copper nanoparticles, via high pressure magnetron sputtering, having highly tunable sizes and shapes over a size range spanning two orders of magnitude. This is achieved by exploiting a reducing gas environment to mediate proper nucleation conditions, allowing size control of nanoparticles with robust motifs for particle sizes similar to 5-300 nm. However, due to rapid coalescence oxidation-free nanoparticles cannot be produced monodisperse for sizes larger than similar to 30 nm.
- TRANSMISSION ELECTRON-MICROSCOPY
- LOGNORMAL SIZE DISTRIBUTIONS
- ULTRAFINE METAL PARTICLES
- SURFACE FREE ENERGY
- NANOCLUSTER FILMS