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Nanomaterials 2017, 7(1), 6; doi:10.3390/nano7010006

Spectroscopic Characterization of Copper-Chitosan Nanoantimicrobials Prepared by Laser Ablation Synthesis in Aqueous Solutions

1
IFN-CNR, Physics Department “M. Merlin”, Bari 70126, Italy
2
Chemistry Department, Università degli Studi di Bari “Aldo Moro”, Bari 70126, Italy
3
Physics Department, Università degli Studi di Bari “Aldo Moro”, Bari 70126, Italy
4
Department of Pharmacy-Drug Sciences, Università degli Studi di Bari “Aldo Moro”, Bari 70126, Italy
Dedicated in memory of Pier Giorgio Zambonin.
*
Authors to whom correspondence should be addressed.
Academic Editor: Shirley Chiang
Received: 29 November 2016 / Revised: 15 December 2016 / Accepted: 26 December 2016 / Published: 30 December 2016
(This article belongs to the Special Issue New Developments in Nanomaterial Analysis)
View Full-Text   |   Download PDF [2489 KB, uploaded 30 December 2016]   |  

Abstract

Copper-chitosan (Cu-CS) nanoantimicrobials are a novel class of bioactive agents, providing enhanced and synergistic efficiency in the prevention of biocontamination in several application fields, from food packaging to biomedical. Femtosecond laser pulses were here exploited to disrupt a Cu solid target immersed into aqueous acidic solutions containing different CS concentrations. After preparation, Cu-CS colloids were obtained by tuning both Cu/CS molar ratios and laser operating conditions. As prepared Cu-CS colloids were characterized by Fourier transform infrared spectroscopy (FTIR), to study copper complexation with the biopolymer. X-ray photoelectron spectroscopy (XPS) was used to elucidate the nanomaterials’ surface chemical composition and chemical speciation of the most representative elements. Transmission electron microscopy was used to characterize nanocolloids morphology. For all samples, ξ-potential measurements showed highly positive potentials, which could be correlated with the XPS information. The spectroscopic and morphological characterization herein presented outlines the characteristics of a technologically-relevant nanomaterial and provides evidence about the optimal synthesis parameters to produce almost monodisperse and properly-capped Cu nanophases, which combine in the same core-shell structure two renowned antibacterial agents. View Full-Text
Keywords: copper nanoparticles; chitosan; laser ablation; X-ray photoelectron spectroscopy; FTIR copper nanoparticles; chitosan; laser ablation; X-ray photoelectron spectroscopy; FTIR
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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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MDPI and ACS Style

Sportelli, M.C.; Volpe, A.; Picca, R.A.; Trapani, A.; Palazzo, C.; Ancona, A.; Lugarà, P.M.; Trapani, G.; Cioffi, N. Spectroscopic Characterization of Copper-Chitosan Nanoantimicrobials Prepared by Laser Ablation Synthesis in Aqueous Solutions. Nanomaterials 2017, 7, 6.

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