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A metallic nanoparticle dispersion
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A technology of metal nanoparticles and dispersions, which is applied in the direction of nanotechnology, metal pattern materials, conductive coatings, etc., and can solve the problems of reduced conductivity
Active Publication Date: 2019-04-16
AGFA GEVAERT AG
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The appearance of such pinholes may lead to a decrease in conductivity
Method used
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Embodiment 1
[0279] Preparation of Silver Nanoparticle Dispersion NPD-01
[0280] 78.0 g of silver oxide was slowly added with stirring into a 1 liter reactor containing 275.0 g of valeric acid and 401.0 g of 2-pyrrolidone. The temperature of the mixture was maintained at 25°C.
[0281] After complete addition of silver oxide, the suspension was stirred overnight at 25°C.
[0282] Then, 300.0 g of N,N-diethylhydroxylamine were added to the suspension over a time span of 1.5 hours. The temperature of the reaction mixture was maintained at 25 °C. When all reducing agent was added, the reaction mixture was maintained at 25°C while stirring for an additional hour.
[0283] The reaction mixture was then added to a precipitation vessel where it was kept overnight without stirring. Carefully remove the supernatant from the pellet.
[0284] The obtained precipitate was washed four times, twice with Dowanol PM TM (547 g) washed twice with butyl cellosolve TM (547g) washed. In each washing s...
Embodiment 2
[0307] Preparation of silver inks SI-06 to SI-11
[0308] Silver inks SI-06 to SI-11 were prepared by mixing together the non-silver ingredients of Table 10 while stirring until a clear solution was obtained. The silver nanoparticle dispersion NPD-01 was then added to the clear solution, followed by high shear homogenization.
[0309] Table 10
[0310]
[0311] Evaluation of Silver Ink SI-06 to Si-011
[0312] The dynamic viscosities of silver inks SI-06 to SI-11 measured as described above are given in Table 11.
[0313] Table 11
[0314]
[0315] From the results in Table 11, it can be clearly seen that the viscosity of the silver ink SI-09 of the present invention under low shear (1 / s and 10 / s) is lower than that of the comparative examples, while the viscosity under high shear Viscosity is still acceptable for good print quality. Lower viscosity at low shear results in improved screen flooding, ie spreading of the ink on the screen.
[0316] After screen printi...
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Abstract
A metallic nanoparticle dispersion comprising metallic nanoparticles, a liquid carrier and an optional binder, characterized in that the dispersion further comprises a silane compound according to Formula (I) wherein R1, R2 and R3 are independently selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, an alkoxy group and an aryloxy group with the proviso that at least one of R1 to R3 represents an alkoxy group or an aryloxy group, L1 represents a divalent linking group comprising one to 20 carbon atoms, A represents a thiol, a disulfide or a functional moiety comprising at least one thiol or disulfide, having no more than 10 carbon atoms, and n represents 0 or 1.
Description
field of invention [0001] The present invention relates to metal nanoparticle dispersions, such as nanosilver dispersions, and conductive inks and pastes prepared therefrom. The present invention also relates to methods of preparing metal nanoparticle dispersions, and conductive layers or patterns formed from metal nanoparticle dispersions or inks under moderate curing conditions. Background of the invention [0002] Over the past few decades, interest in metal printing or coating fluids containing metal nanoparticles has increased due to their unique properties compared to the bulk properties of a given metal. For example, the melting point of metal nanoparticles decreases with decreasing particle size, making them attractive for printed electronics, electrochemical, optical, magnetic, and biological applications. [0003] The production of stable and concentrated metal printing or coating fluids, which can be printed, eg by inkjet printing, or coated at high speed, is of ...
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