A method of manufacturing a conductive pattern
A patterned, conductive silver technology, applied in the post-processing of printing, ink, printing, etc., can solve the problems of the influence of the final silver layer conductivity, the insufficient jetting stability of silver inkjet ink, inkjet printing, etc.
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[0162] Preparation of silver ink
[0163] The preparation of silver inks typically involves adding Compound A and other ingredients to the silver particles by using homogenization techniques such as stirring, high shear mixing, sonication, or a combination thereof.
[0164] The silver particles are typically a paste or highly concentrated dispersion of silver nanoparticles from which the silver ink is prepared.
[0165] A preferred method of preparation of silver nanoparticles is disclosed in EP-A 2671927.
[0166] The homogenization step can be carried out at elevated temperatures up to 100°C. In a preferred embodiment, the homogenization step is carried out at a temperature equal to or lower than 60°C.
[0167] It has been observed that for silver inkjet inks, sonication prior to loading the inkjet into the printhead improves jetting performance and ink stability, ie reliability and higher jetting frequency.
[0168] Inkjet printing device
[0169] Various embodiment...
Embodiment 1
[0224] Preparation of Silver Nanoparticle Dispersion NPD-01
[0225] 20.0 grams of silver oxide (from Umicore) was added to a mixture of 40.0 grams of ethanol and 23.0 grams of 2-pyrrolidone with stirring. The pre-dispersion was then stirred for 24 hours.
[0226] Then, 2.67 ml of formic acid (1.25 ml / min) were added to the predispersion with stirring and keeping the temperature at room temperature. After the addition of formic acid, the mixture was further stirred at 23-25°C for 2.5 hours.
[0227] The mixture was then filtered through a 60 µm filter cloth. The filtrate was then concentrated at 40°C, first at 110 mbar for 60 minutes, and then at 60 mbar for 30 minutes, yielding a silver nanoparticle dispersion containing ±45 wt% silver.
[0228] Preparation of silver ink
[0229] Silver inks were prepared by mixing 50 wt % of NPD-01 with 25 wt % of 2-phenoxy-ethanol and 25 wt % of gamma-butyrolactone and an amount of Compound A as specified in the Examples. The amount of...
Embodiment 2
[0231] As described above, silver inkjet inks SI-01 to SI-07 were prepared using compound A-17 that decomposed exothermically and comparative compound A-C01 that decomposed endothermically. The amounts of these two compounds are indicated in Table 4.
[0232] Table 4
[0233] silver ink Compound A [A] Sheet Resistance (Ω / square) Ag content (g / m 2 )
Bulk Conductivity (%) SI-01 - 0.223 4.7 15.9 SI-02 A-17 0.1 0.232 4.73 15.2 SI-03 A-17 0.2 0.214 3.80 20.5 SI-04 A-17 0.3 0.163 2.68 38.2 SI-05 A-C01 0.1 0.187 5.18 17.2 SI-06 A-C01 0.2 0.242 4.11 16.7 SI-07 A-C01 0.3 0.141 6.61 17.9
[0234] Silver inkjet inks SI-01 to SI-07 were coated on Powercoat HD substrates at a wet coating thickness of 10 µm. The coated samples were then placed in a belt system that was operated under a NIR lamp (NIR ADPHOS lamp, 1 bulb, 5.4 kW lamp power). All samples were passed under the lamp at a stage ...
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