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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.
Highlights
Laser ablation synthesis in solution (LASiS) is a modern and intriguing metal nanoparticle production route, which offers several advantages [1]
For the first time, we report on the detailed analytical characterization of Cu-CS nanomaterials synthetized via the
CuNPs were obtained by femtosecond-pulsed laser ablation of a Cu solid target immersed in HAc solutions containing CS at different concentrations
Summary
Laser ablation synthesis in solution (LASiS) is a modern and intriguing metal nanoparticle production route, which offers several advantages [1]. It is clean and straightforward, and it is based on the controlled disruption of a metallic target. It does not require neither reducing agents nor the use of precursors, such as metal salts. Capping agents are not mandatorily required, since the solvent itself can offer a modest stabilizing effect on as-prepared nanophases [2]. Several experimental parameters, including laser operating conditions, can Nanomaterials 2017, 7, 6; doi:10.3390/nano7010006 www.mdpi.com/journal/nanomaterials
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