Laser Ablation Synthesis of Hybrid Copper/Silver Nanocolloids for Prospective Application as Nanoantimicrobial Agents fo
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Laser Ablation Synthesis of Hybrid Copper/Silver Nanocolloids for Prospective Application as Nanoantimicrobial Agents for Food Packaging Rosaria Anna Picca1,*, Anna Di Maria1, Lenka Riháková2, Annalisa Volpe3,4, Maria Chiara Sportelli1, Pietro Mario Lugarà3,4, Antonio Ancona3,*, Nicola Cioffi1 1. Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, Bari, Italy. 2. RCPTM, Joint Laboratory of Optics UP and Institute of Physics AS CR, Palacky University, Olomouc, Czech Republic. 3. IFN-CNR, CNR, Bari, Italy. 4. Dipartimento Interateneo di Fisica “M. Merlin”, Università degli Studi di Bari Aldo Moro, Bari, Italy. * corresponding authors: [email protected] (R.A.P.), [email protected] (A.A.) ABSTRACT This work is focused on the laser ablation synthesis of Cu/Ag nanocolloids in chitosan-based aqueous solution using a flow cell. A two-step process using femtosecond laser pulses was applied to consecutively ablate each metal. As-prepared nanomaterials were morphologically and spectroscopically characterized by Transmission Electron Microscopy, UV-Vis and X-ray Photoelectron spectroscopies. Application of Cu/Ag nanomaterials is envisaged as antibacterial materials for food packaging. INTRODUCTION Bi-metal nanoparticles (NPs) are receiving increasing attention from the scientific community because of their unique catalytic, electrochemical and optical properties, compared to mono-metal NPs [1–10]. The synthesis of Cu/Ag hybrid structures is particularly appealing, due to the combination of the antimicrobial activity exerted by both metals. Laser ablation in liquid (LAL) is a simple, rapid and green approach for the controlled synthesis of these nanophases [11]. Both mono-metal copper and silver nanocolloids have been prepared employing LAL-based approaches without any chemical precursor [12–14]. A plethora of examples have already shown that silver nanocolloids as well copper nanocolloids [15,16] can be produced in water or organic media using nanosecond [17] or femtosecond [18,19] laser pulses. Similarly, we have reported the synthesis of CuNPs in acetone, to be embedded in polylactic acid for food packaging applications [20]. More recently, we have synthesized colloidal CuNPs by femtosecond laser ablation of a Cu plate immersed in a 0.1%v/v Acetic Acid (HAc) solution with Chitosan (CS) as stabilizing agent [21] thus avoiding the use of toxic organic solvents. In this study, we have prepared Cu/Ag hybrid nanocolloids by a two-step LAL process, carried out in a flow-cell system. Ag and Cu targets were alternatively selected as first ablated material, followed by the ablation of the second metal, directly into the primary colloidal solution. CS was always used as capping agent, at its optimal working concentration of 1 g/L in 0.1%v/v HAc solution [21]. Nanocolloids were characterized by Transmission Electron Microscopy (TEM), UV-VIS, and X-ray Photoelectron Spectroscopy (XPS), to evaluate their morphology and chemical composition. Thanks to their significant bioactivity and associated low toxicity for h
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