Near-IR sintering of conductive silver nanoparticle ink with in situ resistance measurement / David J. Keller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1699-1705 Titre : Near-IR sintering of conductive silver nanoparticle ink with in situ resistance measurement Type de document : texte imprimé Auteurs : David J. Keller, Auteur ; Krystopher S. Jochem, Auteur ; J. Suszynski, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2019 Article en page(s) : p. 1699-1705 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argent Conduction électrique Encre -- Séchage sous rayonnement infrarouge Encre électronique Frittage Le frittage est un procédé de fabrication de pièces consistant à chauffer une poudre sans la mener jusqu’à la fusion. Sous l'effet de la chaleur, les grains se soudent entre eux, ce qui forme la cohésion de la pièce. Impression jet d'encre Nanoparticules Index. décimale : 667.9 Revêtements et enduits Résumé : Metal nanoparticle inks are excellent options for printing low-resistance metal conductors and electrical interconnects. However, after deposition, these inks require high-temperature annealing to sinter and increase conductivity. Infrared (IR) heaters are an efficient, roll-to-roll compatible method to apply thermal energy. Here, we characterize the effect of near-infrared (N-IR) heating on the structure and properties of printed silver nanoparticle ink (UTD Ag40x, UT Dots Inc.). A method was developed to measure the resistance and temperature of printed conductive inks as a function of exposure to the IR heater. The N-IR heater was found to sinter the Ag40x silver samples (lower the resistance of 7 mm printed lines to 1000 Ω) in 11.6 ± 1.5 min at maximum intensity with a large drop from the highest measured resistance (60 MΩ) to 1000 Ω in 1.2 ± 0.2 min. Decreasing the heater power increased the time to reach 1000 Ω (to 28.3 ± 2.0 min at 80%), but reducing from 60 MΩ to 1000 Ω still only took 1.9 ± 0.3 min. This suggests sintering progresses rapidly once initiated. SEM images of the ink before and after IR heating show microstructural changes associated with sintering and indicate the role of agglomerates and organic binders in impeding sintering. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Aerosol jet printing of silver ink - IR sintering of silver ink - Temperature monitoring - Scanning electron microscopy of silver ink - RESULTS AND DISCUSSION : Resistance measurements - Temperature changes during sintering - SEM characterization DOI : 10.1007/s11998-019-00268-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00268-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33423 [article]

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Roll-to-roll micromolding ov UV curable coatings / Yuyang Du in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 627-639 Titre : Roll-to-roll micromolding ov UV curable coatings Type de document : texte imprimé Auteurs : Yuyang Du, Auteur ; Krystopher S. Jochem, Auteur ; Nitika Thakral, Auteur ; Alon V. McCormick, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2021 Article en page(s) : p. 627-639 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Analyse spectrale Caractérisation Formulation (Génie chimique) Micromoulage Réaction thiol-ène Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Traitement rouleau à rouleau Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, fast and continuous fabrication of microscale structures by roll-to-roll UV imprinting or micromolding is demonstrated on a 121 mm wide web. This process is enabled by a UV curable thiol-ene-acrylate resin system, following the work of Stadlober and coworkers. A series of formulations were prepared with fast curing speeds at ambient conditions, low viscosities, and tunable mechanical properties. The rate and extent of curing as a function of the formulation composition were investigated with Fourier transform infrared spectroscopy. Consistent with the past work, we show that the thiol-ene-acrylate formulations reached high double bond conversions (> 80%) with the maximum conversion increasing with the relative thiol content and decreasing with the viscous urethane acrylate oligomer content. The double bond conversion of the patterned coatings (in contact with the mold) is shown to be ~ 80% for a range of UV lamp powers and web speeds up to 2.7 cm/s. Areas of the coating not covered by the mold required higher UV lamp power and/or lower web speeds to cure to a tack-free state. Microscale channels and arrays of recessed wells with various dimensions and pattern densities were continuously fabricated. Our findings show the successful use of a tetrafunctional thiol in the thiol-ene-acrylate resin system. We also discuss guidelines for the selection of processing conditions for the manufacturing of structured plastic substrates using roll-to-roll imprinting processes, opening up potential new applications. Note de contenu : - EXPERIMENTAL : Materials - Dynamic viscosity - FTIR spectroscopy - Dynamic mechanical analysis - Preparation of PDMS mold - R2R imprinting or micromolding - RESULTS AND DISCUSSION : Formulation characterization - R2R UV micromolding - Table 1 : Compositions of R2R UV micromolding formulations DOI : https://doi.org/10.1007/s11998-020-00467-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00467-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35917 [article]

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