Lee, Minki Parajuli, Sajjan Moon, Hyeokgyun Song, Ryungeun Lee, Saebom Shrestha, Sagar Park, Jinhwa Yang, Hao Jung, Younsu Cho, Gyoujin Lee, Jinkee 2024-01-19T12:31:43Z 2024-01-19T12:31:43Z 2022-04-14 2022-03 https://pubs.kist.re.kr/handle/201004/115544 The rheological properties of silver inks are analyzed, and the printing results are presented based on the inks and roll-to-roll (R2R) printing speed. The shear viscosity, shear modulus, and extensional viscosity of the inks are measured using rotational and extensional rheometers. The inks exhibit the shear thinning power law fluids because the concentration of dispersed nanoparticles in the solvent is sufficiently low, which minimizes elasticity. After the inks are printed on a flexible substrate through gravure printing, the optical images, surface profiles, and electric resistances of the printed pattern are obtained. The width and height of the printed pattern change depending on the ink viscosity, whereas the printing speed does not significantly affect the widening. The drag-out tail is reduced at high ink viscosities and fast printing speeds, thereby improving the printed pattern quality in the R2R process. Based on the results obtained, we suggest ink and printing conditions that result in high printing quality for complicated printings, such as overlay printing registration accuracy, which imposes pattern widening and drag-out tails in printed patterns. English IOP PUBLISHING LTD Characterization of silver nanoparticle inks toward stable roll-to-roll gravure printing Article 10.1088/2058-8585/ac49db 1 Flexible and Printed Electronics, v.7, no.1 Flexible and Printed Electronics 7 1 N scie scopus 000775212800001 2-s2.0-85124128326 Materials Science, Multidisciplinary Materials Science Article THIN-FILM TRANSISTORS SCALABILITY CELL roll-to-roll gravure printing rheology nanoparticle ink