The solvent is defined by your particles. It is not correct analyze size of your particles if the colloidal suspension is not stable (if you are after monodispersed particles).
Also, some solvents are know to absorb UV and have to be calibrated properly, meaning you have take spectra of solvent and substruct it from spectra of colloidal suspension to take in account "solvent affect".
Equipment used to measure particle size and absorptivity comes with documentation that provides necessary information. It gets even worse, some equipment is designed to work with certain solvents only. That is why you should first read the manual(s) to see what you can work with and then pick your solvent based on stability of your system and application purposes.
Analysis of the size distribution of semiconductor nanoparticles can be carried out by examining their photoluminescence spectra as presented in the paper, which is attached. The fact is that in cases of quantum size effect the energy position of the exciton bands will depend on their size: the smaller the size the greater the emission energy of the excitons, which are formed in the nanoparticles. Analysis of the structure
of exciton luminescence can get the necessary information.
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