Single-step printing of metallic nanoparticles in 2D micropatterns
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RESEARCH PAPER
Single-step printing of metallic nanoparticles in 2D micropatterns Paulina R. Ferreira & Wagner Correr & Cleber R. Mendonça & Juliana M. P. Almeida
Received: 6 January 2020 / Accepted: 18 August 2020 # Springer Nature B.V. 2020
Abstract This work demonstrates a single-step method for synthesis and printing of metallic nanoparticles (NPs) in 2D micropatterns. The method is based on femtosecond laser writing, enabling fast and high precision deposition of silver, gold, or copper NPs in spaceselective areas, which in general is not achieved by the traditional chemical routes or laser ablation of metal. Such finds were accomplished by employing laserinduced forward transfer in the femtosecond pulse regime (fs-LIFT). The results are promising for application, since metallic NPs, with a lognormal diameter distribution averaging between ~ 4 and 30 nm, allow exploring plasmon bands throughout the visible spectrum. The mechanisms behind NP formation by fs-LIFT are discussed based on the thermomechanical response of the material. An estimative based on the heat transfer suggests the occurrence of mechanical fragmentation rather than material vaporization. The main result addressed herein, however, is the ability to deposit silver, P. R. Ferreira : W. Correr : C. R. Mendonça : J. M. P. Almeida São Carlos Institute of Physics, University of São Paulo, PO Box 369, Sao Carlos, SP 13560-970, Brazil W. Correr Centre d’Optique, Photonique et Laser, Université Laval, 2375 rue de la Terrasse, Quebec, QC G1V0A6, Canada J. M. P. Almeida (*) Department of Materials Engineering, São Carlos School of Engineering, University of São Paulo, Av. João Dagnone, 1100, Sao Carlos, SP 13563-120, Brazil e-mail:
gold, and copper nanoparticles in selected regions, supporting the development of NP-based devices via one-step processing and their application in sensors and photonic circuits. Keywords Metallic nanoparticles . Laser printing . Laser-induced forward transfer—LIFT . Femtosecond laser . Silver . Gold . Copper
Introduction Metallic nanoparticles (NPs) are notarial materials to a vast community of scientists, including chemists, physicists, materials scientists, and biologists, due to the properties associated with the plasmon resonance, which have supported new opportunities for the development of photonic devices (Barnes et al. 2003). It is worth quoting miniaturized optical circuits, sensors for biologic molecules detection, and solar cells (Bensebaa 2013). Metallic NP structure and properties can be described by a simple model in which almost free conduction electrons surround a lattice of ionic cores. When hit with an electromagnetic field, these electrons are induced to vibrate in the plasmonic frequency, thus generating a phenomenon known as surface plasmon resonance (SPR) (Hövel et al. 1993; Garcia 2012; Jana et al. 2016). SPR is a NP intrinsic characteristic, influenced and modified by several factors, such as size, shape, aggregation, and population of NPs. The interaction between surface electrons and electromagn
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