Formulation and screen printing of water based conductive flake silver pastes onto green ceramic tapes for electronic applications

Faddoul, Rita; Reverdy-Bruas, Nadège; Blayo, Anne

doi:10.1016/j.mseb.2012.05.015

Cited by 149 publications

(113 citation statements)

References 38 publications

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“…Frequency-dependence curves provide information on the 3-dimensional networks formed in materials [8,14]. When particles are dispersed in a polymer-solution matrix, the highand low-frequency behaviors report on the polymer-solution matrix and the microstructural details of the particle dispersion, respectively [10].…”

Section: Frequency Dependencementioning

confidence: 99%

“…This may be due to the former's high recovery ratio. The fast recovery of the paste prevents it spreading and/or leveling out after printing, resulting in thickness inhomogeneity [14]. Figs.…”

Section: Screen Printingmentioning

confidence: 99%

“…When the squeegee moves across the paste applying a high shear rate and pushing the paste through the screen mesh [12], the viscosity drops very fast [13]. Then, the viscosity of the paste is progressively recovered when the stress or shear is removed [14]. The rheological behavior of the paste immediately after shearing is key to understanding the mechanisms governing film formation through screen-printing.…”

Section: Introductionmentioning

confidence: 99%

“…The rheological behavior of the paste immediately after shearing is key to understanding the mechanisms governing film formation through screen-printing. This can be simulated using 3-step recovery tests, which involve stepping the initially low shear rate up to high values and then back down again, with the recovery time providing a quantitative measure of the leveling and uniformity of line formation properties, as reported previously for silver paste [14]. However, the impacts of a complex rheology and a wide range of recovery properties remain unclear on the printability of ceramic pastes for thick large-area films.…”

Section: Introductionmentioning

confidence: 99%

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Rheological analysis of ceramic pastes with ethyl cellulose for screen-printing

Inukai

Takahashi

et al. 2015

Ceramics International

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Section: Frequency Dependencementioning

confidence: 99%

Section: Screen Printingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rheological analysis of ceramic pastes with ethyl cellulose for screen-printing

Inukai

Takahashi

et al. 2015

Ceramics International

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“…The ink should have high viscosity at low shear rates when the ink is charged to the printer, low viscosity during printing at high shear rate, and finally viscosity recovery of high viscosity after printing. 8,23 While rapid viscosity recovery promotes sharp line definition, too rapid recovery inhibits suppression void filling and film leveling.The investigation of the rheological behavior of suspensions can be challenging due to the necessity for an appropriate rheometer configuration, measurement protocol and data analysis suitable for suspensions. For this work, we chose a parallel plate rather than a cone and plate configuration because the finite size of the nanowires would complicate behavior near the apex of the cone.…”

mentioning

confidence: 99%

Synthesis and Characterization of Silver Nanowire Suspensions for Printable Conductive Media

Hemmati¹,

Barkey²,

Gupta³

et al. 2015

ECS J. Solid State Sci. Technol.

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The purposes of this work are scaled-up synthesis of silver nanowires (AgNWs), assessment of their growth mechanism and measurement of the rheological properties of nanowire suspensions suitable for screen printing conductive circuits. A polyol synthesis process was used. The morphology and microstructure at various stages of the process were characterized by scanning electron microscopy (SEM). Aqueous silver nanowire inks with dispersant and binder were formulated. The rheological behavior of the inks was characterized by Stress Sweep Step (SSS), Steady State Flow Step (SSFS), Frequency Sweep Step (FSS) and Peak Hold Step (PHS) with a parallel plate rheometer. Rheological measurements under conditions that mimic the screen printing process have been done on the conductive inks through the PHS test to assess viscoelastic properties induced by flow alignment of the wires. Finally, the effect of silver nanowires on the rheological behavior of the ink has been compared with the effect of silver threedimensional (3D) nanoparticles (AgNPs). Since most of the available commercial silver inks suitable for screen printing process are non-aqueous solvent based, a contribution of this study is formulation of an environmentally benign water based nanowire ink. Metal one-dimensional (1D) nanostructures can play a valuable role in electronic devices, and have recently gained much attention due to their unique electrical, optical, and thermal properties. Because of the high thermal and electrical conductivity of bulk silver, it is one of the most promising metal nanowire materials.1-8 Silver nanowires hold promise as the conductive material in conductive inks suitable for screen printing. 8,[10][11][12][13][14][15] There are several methods to synthesize silver nanowires including the polyol process, hydrothermal synthesis, wet chemical process and irradiation photo reduction. Among these, the polyol process is simple and inexpensive, and provides a relatively high yield. 6 The polyol process proceeds by chemical reduction of silver ion in the presence of a polymeric surfactant. Poly(Vinyl Pyrrolidone) (PVP) acts to cap the (100) facet leading to uniaxial elongation of the initially formed silver seeds. In this process a trace amount of suitable salt can facilitate the growth of the initially formed silver seeds to the desired shape. The ethylene glycol functions as both solvent and reducing agent. [1][2][3] Various methods of printing have been used for the fabrication of printed circuits. Among these, screen printing is a rapid and inexpensive process.9 Thin printed circuits are applied in many technologies such as solar panels, flexible circuitries, and touch screens. [15][16][17][18][19][20][21][22] In screen printing, the ink is forced through a patterned screen onto a substrate. The printed pattern characteristics depend critically on the rheological properties of the ink.8 Strong shear thinning behavior permits charging of the ink at low shear onto the screen, followed by printing through the screen at high shear. Reco...

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A Water‐Based Silver‐Nanowire Screen‐Print Ink for the Fabrication of Stretchable Conductors and Wearable Thin‐Film Transistors

2016

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A water-based silver-nanowire (AgNW) ink is formulated for screen printing. Screen-printed AgNW patterns have uniform sharp edges, ≈50 μm resolution, and electrical conductivity as high as 4.67 × 10(4) S cm(-1) . The screen-printed AgNW patterns are used to fabricate a stretchable composite conductor, and a fully printed and intrinsically stretchable thin-film transistor array is also realized.

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Formulation and screen printing of water based conductive flake silver pastes onto green ceramic tapes for electronic applications

Cited by 149 publications

References 38 publications

Rheological analysis of ceramic pastes with ethyl cellulose for screen-printing

Rheological analysis of ceramic pastes with ethyl cellulose for screen-printing

Synthesis and Characterization of Silver Nanowire Suspensions for Printable Conductive Media

A Water‐Based Silver‐Nanowire Screen‐Print Ink for the Fabrication of Stretchable Conductors and Wearable Thin‐Film Transistors

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