It is TiO2 thin film which is coated with dip coating. Now other than BET analyser if i want to porosity by UV-Vis then how will i calculate the porosity of the film??
The specific surface area, pore volume and pore size of the ordered TiO2 porous materials were examined using N2 as the adsorbate https://ir.nctu.edu.tw/bitstream/11536/10031/1/000251183500028.pdf
A light transmission technique for pore size measurement is given in refference: https://www.researchgate.net/publication/258147100_A_light_transmission_technique_for_pore_size_measurement_in_track-etched_membranes
Article A light transmission technique for pore size measurement in ...
Roy, plz do Surface area and BJH pore size distribution analysis by N2 adsorption-desorption. Mani, I agree with you a little and go through your paper which explains a little. So, it is best go with N2...Good Luck.