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The successful isolation of cyclo-C18 in the experiment means theground-breaking epoch of carbon rings. Herein, we studied the thermodynamicstabilities of cyclo-Cn (4 $\leq$ n $\leq$ 34) with density functional theory.When n = 4N + 2 (N is integer), cyclo-Cn (10 $\leq$ n $\leq$ 34) werethermodynamically stable. Especially, cyclo-C10 and cyclo-C14 werethermodynamically, kinetically, dynamically, and optically preferred tocyclo-C18, and were the candidates of zero-dimension carbon rings. The carbonatoms were sp hybridization in cyclo-C10, cyclo-C14 and cyclo-C18. Cyclo-C14and cyclo-C18 had alternating abnormal single and triple bonds, but cyclo-C10had equal bonds. Cyclo-C10, cyclo-C14, and cyclo-C18 with large aromaticitieshad out-plane and in-plane pi systems, which were perpendicular to each other.The number of pi electrons in out-plane and in-plane pi systems followed theHuckel rule. Simulated UV-vis-NIR spectra indicated the similar electronicstructures of cyclo-C14 and cyclo-C18.

Potential molecular semiconductor devices: cyclo-Cn (n = 10 and 14) with higher stabilities and aromaticities than acknowledged cyclo-C18