▎ 摘　　要

Figuring out the influences of carbonaceous particle properties on icenucleation is important to atmospheric science, but it is still a challenge, especially forexperimental investigations due to the coupling effect of multiple properties. Here weseparately investigate the effects of oxidation degree and size, two typical and debated factors,on ice nucleation efficiency by choosing graphene oxide (GO) as the model. The results showthat with the decrease of oxidation degree, ice nucleation efficiency increases throughdecreasing the ice nucleation free energy barrier (Gheter Delta*) on GO surface. Interestingly,although the chosen GO sizes are sufficiently large compared with the sizes of critical icenuclei, the increase of GO size leads to the increase ofGheter Delta*and thus the decrease of icenucleation efficiency, unlike the general thought thatGheter Delta*is not affected by the particle sizeany more when the size of particle increases to several times that of the critical ice nucleus.