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where T is the transmittance index and t is the film thickness. The Eg value is therefore determined by extrapolating the linear portion of the plot relating (αhν) versus hν (inset in figure 3). The obtained value of Eg is 3.196 eV. which is highly underestimated by the theoretical value obtained here (0.91 eV). It is well known that the conventional DFT can underestimate the experimental band gap and despite the incorporation of the semiempirical LDA+U approach, there is still a significant gap between experience and theory.

Halloysite Nanotubes as Innovative Consolidants for Historical Leather