Recent advances in nanoparticle size measurement with a particle growth system combined with an optical particle counter—A feasibility study

Methods of Detection and Characterization

“…In the case of particles with diameter less than 10 nm, the final droplet size also depends on that of the initial nucleus; this observation is used to measure size distribution of particles between 2 and 10 nm [43,44].…”

Nucleation: theory and experiment

“…360 The construction of a counter of aerosol particles is gradually improved. Thus, the schemes have already been developed, 361,362 which enable one to detect particles with sizes of 3 nm with an efficiency of almost 100%.…”