Effect of substrate temperature on MAPLE deposition of synthetic eumelanin films |
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Authors: | F Bloisi A Pezzella M Barra M Alfè F Chiarella A Cassinese L Vicari |
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Institution: | (1) Department of Physics, University of Salento, Via Arnesano, Lecce, 73100, Italy;(2) Dipartimento di Ingegneria dell’Innovazione, University of Salento, Via Arnesano, Lecce, 73100, Italy;(3) Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Arnesano, Lecce, 73100, Italy |
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Abstract: | Eumelanin is an important pigment almost ubiquitous in animals and plants exhibiting interesting charge transport capabilities.
Its poor solubility in common solvents represents a severe limitation for preparing thin films. It was recently demonstrated
that eumelanin films can be successfully deposited with the MAPLE (Matrix Assisted Pulsed Laser Evaporation) technique starting
from a frozen water suspension, using infrared laser radiation. The low laser absorption of ice together with the high absorption
of eumelanin suggests that the target ablation is due to laser energy absorbed by the eumelanin molecules, followed by thermal
energy transfer, and ejection of ice/water/vapor containing undamaged eumelanin molecules and supramolecular structures. |
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