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Absorption energy of Pt nanoparticles decreased from 5.83 to 5.72 eV for the first peak and from 4.75 to 4.69 for the second peak with increasing particle size from 3.4 to 5.3 nm which corresponds to the change of absorption peak from 212.7 to 216.6 nm for the first peak and from 260.9 to 264.6 nm for the second peak.
