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Open AccessArticle

Selective Laser Sintering of Laser Printed Ag Nanoparticle Micropatterns at High Repetition Rates

1
Physics Department, Zografou Campus, National Technical University of Athens, 15780 Athens, Greece
2
School of Engineering, University of West Attica, Campus 1, 12243 Aigaleo, Greece
3
Oxford Lasers Ltd., 8 Moorbrook Park, Didcot, Oxon OX11 7HP, UK
4
PV Nano Cell Ltd., 8 Hamasger st., P.O. Box 236 Migdal Ha’Emek, Migdal Haemek 2310102, Israel
*
Author to whom correspondence should be addressed.
Materials 2018, 11(11), 2142; https://doi.org/10.3390/ma11112142
Received: 29 September 2018 / Revised: 24 October 2018 / Accepted: 25 October 2018 / Published: 31 October 2018
(This article belongs to the Special Issue Selective Laser Sintering (SLS) of Materials)
The increasing development of flexible and printed electronics has fueled substantial advancements in selective laser sintering, which has been attracting interest over the past decade. Laser sintering of metal nanoparticle dispersions in particular (from low viscous inks to high viscous pastes) offers significant advantages with respect to more conventional thermal sintering or curing techniques. Apart from the obvious lateral selectivity, the use of short-pulsed and high repetition rate lasers minimizes the heat affected zone and offers unparalleled control over a digital process, enabling the processing of stacked and pre-structured layers on very sensitive polymeric substrates. In this work, the authors have conducted a systematic investigation of the laser sintering of micro-patterns comprising Ag nanoparticle high viscous inks: The effect of laser pulse width within the range of 20–200 nanoseconds (ns), a regime which many commercially available, high repetition rate lasers operate in, has been thoroughly investigated experimentally in order to define the optimal processing parameters for the fabrication of highly conductive Ag patterns on polymeric substrates. The in-depth temperature profiles resulting from the effect of laser pulses of varying pulse widths have been calculated using a numerical model relying on the finite element method, which has been fed with physical parameters extracted from optical and structural characterization. Electrical characterization of the resulting sintered micro-patterns has been benchmarked against the calculated temperature profiles, so that the resistivity can be associated with the maximal temperature value. This quantitative correlation offers the possibility to predict the optimal process window in future laser sintering experiments. The reported computational and experimental findings will foster the wider adoption of laser micro-sintering technology for laboratory and industrial use. View Full-Text
Keywords: laser sintering; laser induced forward transfer; silver nanoparticle inks; heat affected zone; high speed laser processing laser sintering; laser induced forward transfer; silver nanoparticle inks; heat affected zone; high speed laser processing
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MDPI and ACS Style

Zacharatos, F.; Theodorakos, I.; Karvounis, P.; Tuohy, S.; Braz, N.; Melamed, S.; Kabla, A.; De la Vega, F.; Andritsos, K.; Hatziapostolou, A.; Karnakis, D.; Zergioti, I. Selective Laser Sintering of Laser Printed Ag Nanoparticle Micropatterns at High Repetition Rates. Materials 2018, 11, 2142. https://doi.org/10.3390/ma11112142

AMA Style

Zacharatos F, Theodorakos I, Karvounis P, Tuohy S, Braz N, Melamed S, Kabla A, De la Vega F, Andritsos K, Hatziapostolou A, Karnakis D, Zergioti I. Selective Laser Sintering of Laser Printed Ag Nanoparticle Micropatterns at High Repetition Rates. Materials. 2018; 11(11):2142. https://doi.org/10.3390/ma11112142

Chicago/Turabian Style

Zacharatos, Filimon; Theodorakos, Ioannis; Karvounis, Panagiotis; Tuohy, Simon; Braz, Nuno; Melamed, Semyon; Kabla, Ayala; De la Vega, Fernando; Andritsos, Kostas; Hatziapostolou, Antonios; Karnakis, Dimitris; Zergioti, Ioanna. 2018. "Selective Laser Sintering of Laser Printed Ag Nanoparticle Micropatterns at High Repetition Rates" Materials 11, no. 11: 2142. https://doi.org/10.3390/ma11112142

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