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Coatings 2018, 8(8), 275; https://doi.org/10.3390/coatings8080275

Shellac Thin Films Obtained by Matrix-Assisted Pulsed Laser Evaporation (MAPLE)

1
National Institute for Lasers, Plasma, and Radiation Physics, 409 Atomistilor Street, P.O. Box MG-16, RO-077125 Magurele, Romania
2
Faculty of Sciences, University of Craiova, RO-200585 Craiova, Romania
3
CNRS, IRCER—UMR 7315, University of Limoges, F-87000 Limoges, France
*
Author to whom correspondence should be addressed.
Received: 14 June 2018 / Revised: 27 July 2018 / Accepted: 3 August 2018 / Published: 7 August 2018
(This article belongs to the Special Issue Current Research in Pulsed Laser Deposition)
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Abstract

We report on the fabrication of shellac thin films on silicon substrates by matrix-assisted pulsed laser evaporation (MAPLE) using methanol as matrix. Very adherent, dense, and smooth films were obtained by MAPLE with optimized deposition parameters, such as laser wavelength and laser fluence. Films with a root mean square (RMS) roughness of 11 nm measured on 40 × 40 µm2 were obtained for a 2000-nm-thick shellac film deposited with 0.6 J/cm2 fluence at a laser wavelength of 266 nm. The MAPLE films were tested in simulated gastric fluid in order to assess their capabilities as an enteric coating. The chemical, morphological, and optical properties of shellac samples were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and atomic force microscopy (AFM). View Full-Text
Keywords: thin films; matrix-assisted pulsed laser evaporation; shellac; enteric coatings thin films; matrix-assisted pulsed laser evaporation; shellac; enteric coatings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Brajnicov, S.; Bercea, A.; Marascu, V.; Matei, A.; Mitu, B. Shellac Thin Films Obtained by Matrix-Assisted Pulsed Laser Evaporation (MAPLE). Coatings 2018, 8, 275.

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