A Study of the Optical Bandgap Energy and Urbach Energy Tail of Two White A4 Copy Paper Samples
Katerina Chryssou · Annals of Chemical Science Research · 2021
Two white Α4 copy paper samples Q-Connect and Laser Copy were tested for the fiber component of their pulps using the optical microscope and were determined as chemical pulps.UV-VIS data revealed the values of Urbach energies of 498.2meV and 498.1meV of the two copy paper samples respectively, when the thickness of both samples was d=1mm.The value of indirect bandgap energy was calculated to be 1.16984469010026eV for Q-Connect copy paper sample, and 1.1698449010027eV respectively, with the Laser Copy paper sample.The Urbach energy of the A4 copy paper sample Q-Connect was calculated to be 333.7meVwhen its thickness was d=0.101mm whereas the Urbach energy of the A4 copy paper sample Laser Copy was calculated to be 330.2meVwhen its thickness was d=0.094mm.A decrease in Urbach energy with a decrease in thickness from 101μm to 94μm, and an increase in energy band gap, were observed for the two copy paper samples, respectively.