Journal
POLYMERS
Volume 12, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/polym12123065
Keywords
chitosan– hydroxyapatite composite coatings; radio frequency magnetron sputtering plasma discharge; grain-like structure surfaces
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Funding
- Romanian Ministry of Research and Innovation within the NUCLEU project [PN 19 15 01 01/2019]
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Chitosan-hydroxyapatite composite layers were deposited on Si substrates in radio frequency magnetron sputtering discharges. The plasma parameters calculated from the current-voltage radio frequency-compensated Langmuir probe characteristics indicate a huge difference between the electron temperature in the plasma and at the sample holder. These findings aid in the understanding of the coagulation pattern of hydroxyapatite-chitosan macromolecules on the substrate surface. An increase in the sizes of the spherical-shape grain-like structures formed on the coating surface with the plasma electron number density was observed. The link between the chemical composition of the chitosan-hydroxyapatite composite film and the species sputtered from the target or produced by excitation/ionization mechanisms in the plasma was determined on the basis of X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and residual gas mass spectrometry analysis.
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