High-Resolution Electrohydrodynamic Printing of Silver Reactive Inks
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High-Resolution Electrohydrodynamic Printing of Silver Reactive Inks Christopher Lefky, Galen Arnold and Owen Hildreth MRS Advances / FirstView Article / July 2016, pp 1 - 6 DOI: 10.1557/adv.2016.482, Published online: 28 June 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116004825 How to cite this article: Christopher Lefky, Galen Arnold and Owen Hildreth High-Resolution Electrohydrodynamic Printing of Silver Reactive Inks. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.482 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.482
High-Resolution Electrohydrodynamic Printing of Silver Reactive Inks Christopher Lefky1, Galen Arnold1 and Owen Hildreth1 1 Arizona State University, Tempe, AZ 85281, U.S.A. ABSTRACT Nano-inkjet printing using an Electrohydrodynamic's (EHD) pulsed cone-jet approach has the potential to bring affordable additive manufacturing to the micro and nanoscale. Ink technology is a major limitation of current EHD techniques. Specifically, most EHD printing processes print either nanoparticles or polymers. The materials are structurally weak and often have poor electrical or mechanical properties. For example, printing nanoparticles effectively creates a cluster of nanoparticles that must be sintered to create a continuous material. To address these issues, we have been adapting reactive inks to work with an EHD pulsed cone-jet. Specifically, we demonstrate that silver micron-scale structures can be printed using an EHD pulsed cone-jet regime. These inks produce solid structures without sintering steps and with good electrical properties.1,2 This work shows that reactive ink chemistries can be combined with EHD printing to produce fine-resolution features consisting of solid metal without an annealing step. INTRODUCTION Electrohydrodynamic (EHD) inkjet printing is a robust method of additive manufacturing that has been used to fabricate 3D geometries,3,4 organic light-emitting diodes (OLED)5 and quantum dots,6 and devices.7 Recently, this process has been brought to the nanoscale to fabricate structures from nanoparticles with 50 nm resolution.8 This additive process is particularly attractive for micro/nano-scale device fabrication because it enables direct printing of a complete device with little cost and time. However printing nanoparticles results in structures with relatively poor mechanical and electrical properties as shown by the bending of Au nanoparticle wires in Galliker et al.9 In this work we demonstrate the ability to use a reactive silver ink1 in the EHD cone-jet regime to fabricate solid structures instead of clusters of nanoparticles. The typical nanoparticle inks can use a wide variety of solvents as long as the nanoparticles are properly functionalized as well as maintain a low
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