I want to perform adsorption using DFT code but I can only create nanosheet like structure - supercells from primitive and use them to check their adsorbing selectivity towards certain gas.

I want to know if suppose a material, for example, Cr2O3 is selective towards a gas when I test it using DFT code (3x3x1 supercell of Cr2O3) and if I create nanoparticles or nanotube out of it, how will it affect its selectivity. I am aware nanoparticles will show more sensitivity which will be advantageous for me but I don't have any idea how to create one in my DFT software (I am using Quantum ESPRESSO).

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