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A Hybrid Apprach Combining 3D and Conductive Inkjet Printing for theGeneration of Linear Ion Traps for Mass Spectrometry Applications
KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. XaarJet ltd. (Division of Electronics)
XaarJet ltd.
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2014 (English)In: 30th International Conference on Digital Printing Technologies (NIP 30): Digital Fabrication and Digital PrintingDesc : Proceedings, 2014, p. 133-136Conference paper, Published paper (Other academic)
Abstract [en]

Printed conductors have attracted strong interest in academia as well as the industry. While first applications using printed conductors on flat as well as curved surfaces are establishing in the market, extensive research still is conducted on the postprocessing technologies needed for high-volume fabrication of solution processed conductors. With regards to the potential low-cost, high-throughput manufacturing of conductors on inexpensive polymeric foils, new applications start to evolve that call for an even more elaborate investigation of the printing and post-processing steps included. This paper assesses the potential of inkjet-printed conductors for the use in low-pressure environments, such as linear ion-traps for mass spectrometry. In these environments remainders of trapped air or organic solvents affect the performance and lifetime of the getter pump systems used. Additionally, high frequency characteristics of the processed conductors are investigated as these are essential for the sensitivity of an ion trap. In this contribution we establish the framework for the application of conductive Inkjet printing on curved surfaces for sensing application in low-pressure environments. Inkjet-deposited nanoparticle inks were investigated with respect to their characteristics under vacuum conditions. The deposits on polymeric foils as well as on DLP processed three-dimensional semi-finished parts were subjected to thermal post-processing and measured with respect to their electrical characteristics as well as their outgassing behavior.

Place, publisher, year, edition, pages
2014. p. 133-136
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Fluid Mechanics and Acoustics Media Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263706ISBN: 9781510814387 (print)OAI: oai:DiVA.org:kth-263706DiVA, id: diva2:1368963
Conference
30th International Conference on Digital Printing Technologies (NIP 30): Digital Fabrication and Digital Printing, 7-11 September 2014, Philadelphia, Pennsylvania, USA.
Note

QC 20191115

Available from: 2019-11-09 Created: 2019-11-09 Last updated: 2019-11-15Bibliographically approved
In thesis
1. Industrial Digital Fabrication Using Inkjet Technology
Open this publication in new window or tab >>Industrial Digital Fabrication Using Inkjet Technology
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of acoustic waves initiated by the deformation of a microchannel is one method for generating monodisperse, micrometer-sized droplets from small orifices and is employed in piezo-electric inkjet printheads. These printheads are used in both graphical printing and digital fabrication, where functionalities, such as optical, biological, electrical or mechanical, are being produced locally. The processes leading to detrimental artifacts such as satellite droplets or nozzle outages, however, are not fully understood and require profound experimentation. This thesis presents both novel techniques to study jetting for optimal droplet formation and reliability, as well as the post-processing techniques required for solution-based production of a conductive feature on low-cost polymeric substrates.

A multi-exposure imaging system using laser light pulses shorter than 50 ns and a MEMS micro-mirror enabled the imaging of the droplet formation at ten instances on the droplet's  travel towards the substrate. The technique allows for the study of droplet formation, satellite droplet break-up and secondary tail formation allowing for better control and understanding of the process.

Reliability measurement using a linescan camera was introduced to record every droplet ejected from the width of a printhead. The variations in droplet velocity and misalignment of the printhead required the use of a constant background illumination to reliably capture the droplets. The resulting low-contrast images were post-processed using statistical analysis of the graylevel distributions of both, the droplet and background pixels, and were subsequently used in a histogram matching algorithm to enable reliable identification of the threshold value required for unhindered detection of missing droplets based on the printed image. Using temporal oversampling the technique was shown to qualitatively describe droplet velocity variations introduced by the actuation of the printhead.  

The conversion of inkjet-printed metallic nanoparticle inks to conductive structures was investigated with a focus on the applicability to industrial processes. Intense pulsed light (IPL) processing achieved comparable results to convective oven sintering in less than ten seconds. The dynamics of IPL sintering were found to be strongly dependent on the spectral composition of the light resonating in the processing chamber. By implementing a passive filtering concept, thermal runaway was prevented and the line conformation was optimized irrespective of the underlying substrate. Alternatively, pulse-shaping, to tailor the energy flux into the deposit and incorporate drying in the IPL process, was found to generate conductive copper features without pre-drying.

The findings were applied to applications comprising small droplet generation for nanoimprint lithography, the fabrication of conductors for blind via connections to buried LED dies as well as the hybrid generation of hyperbolic ion-trap electrodes for  mass spectrometry applications. The addition of the non-contact and high accuracy of the inkjet process enabled suitable performance that lies beyond that of conventional processes.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019. p. 92
Series
TRITA-EECS-AVL ; 2019:82
Keywords
inkjet printing, droplet formation, digital fabrication, sintering, nanoparticles, printed electronics
National Category
Media and Communication Technology Other Electrical Engineering, Electronic Engineering, Information Engineering Fluid Mechanics and Acoustics
Research subject
Industrial Information and Control Systems; Media Technology; Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-263711 (URN)978-91-7873-366-8 (ISBN)
Public defence
2019-12-09, Ka-Sal B (Peter Weissglas), Kistagången 16, Kista, 10:00 (English)
Opponent
Supervisors
Funder
EU, FP7, Seventh Framework Programme, CP-TP 228686EU, FP7, Seventh Framework Programme, CP-TP 285045Vinnova, 2013-01473
Available from: 2019-11-11 Created: 2019-11-10 Last updated: 2019-11-11Bibliographically approved

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