Terahertz characterisation of UV offset lithographically printed electronic-ink |
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| Affiliation: | 1. School of Electronic and Computer Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK;2. College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073, China;3. Electronic and Electrical Engineering Department, Thornton Science Park, University of Chester, CH2 4NU, UK;4. Nottingham Trent University, Burton Street, Nottingham, NG1 4BU, UK;5. Biomedical Engineering, School of Biological Sciences, University of Reading, Whiteknights, Reading, RG6 6AY, UK;1. Department of Chemistry, Queen''s University, Kingston, Ontario, Canada;2. Department of Physics, Engineering Physics and Astronomy, Queen''s University, Kingston, Ontario, Canada;3. Department of Chemistry and Chemical Engineering, Royal Military College, Kingston, Ontario, Canada;1. Department of Physics and Astronomy and Optical Science and Technology Center, University of Iowa, Iowa City, IA, 52242, USA;2. Department of Physics and Astronomy, University of Wisconsin Eau Claire, Eau Claire, WI, 54702, USA;1. Institute of Lighting and Energy Photonics, National Chiao-Tung University, Tainan 71150, Taiwan;2. Institute of Photonic System, National Chiao-Tung University, Tainan 71150, Taiwan;3. Department of Biomedical Engineering, Hungkuang University, Taichung City, 43302, Taiwan;4. Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan |
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| Abstract: | Inkjet-printed electronics are showing promising potential in practical applications, but methods for real-time, non-contact monitoring of printing quality are lacking. This work explores Terahertz (THz) sensing as an approach for such monitoring. It is demonstrated that alterations in the localised dielectric characteristics of inkjet-printed electronics can be qualitatively distinguished using quasi-optically-based, sub-THz reflection spectroscopy. Decreased reflection coefficients caused by the sintering process are observed and quantified. Using THz near-field scanning imaging, it is shown that sintering produces a more uniform spatial distribution of permittivity in the printed carbon patterns. Images generated using THz-TDS based imaging are presented, demonstrating the combination of high resolution imaging with quantification of complex permittivities. This work, for the first time, demonstrates the feasibility of quality control in printed electronic-ink with THz sensing, and is of practical significance to the development of in-situ and non-contact commercial-quality characterisation methods for inkjet-printed electronics. |
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| Keywords: | Inkjet-printed electronics THz sensing Spectroscopy THz imaging |
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