2012 10 15-sirris_µprinting_day

le centre collectif de l’industrie technologique belge

µPrinting Day @ Sirris (15th October 2012)

µPrinting : change your paradigm - some cases @ Sirris

SMALL LAB team @ Sirris : carl Emerecht, Denis Vandormael, Eric Beeckman, Guy Lagaeyes, Laurent Seronveaux, Olivier Gramacia, Stephane Louis

Presented by Laurent Seronveaux Research and Project Engineer

Paradigm to break to innovate !

• Paradigm

• Substrate and ink Material

• Porous material

• Flexible substrate

• Textile and conductive tracks

• Textile and sensors

• 3D part functionalizing paradigm

• Electroluminescent lighting

• Sintering methodology

15/10/2012 © sirris 2007 | www.sirris.be | info@sirris.be | 2

A paradigm is a generally accepted perspective of a mental model defined as an interpretive framework of the world or the specific field.

Paradigm Dissonance: A Significant Factor in Design and Business Problems (by Jason Withrow and Mark Geljon)

Since the world is changing you have to change your paradigm to stay in relation with it

Large range of suitable substrate material have to be consider for printed electronic. (ABS, PC, KAPTON,PET, PAPER .... Even for low T° )

The Flexibility is a new concept in the µPrinting and PE (Membrane, Bus, connection on thin film...)

3D parts substrate are suitable µPrinting and PE

©SIRRIS © SIRRIS

Manufacturing Electronic circuitry could be done at Low temperature

Functionalizing material is not limited to Silver but could be : PEDOT, CNT, BIO, Silver, Gold, Pd, etc ...

Substrate and ink Material paradigm

By the past silver was the panacea. Now, things to consider is the compatibility between substrate and ink. The things to respect is the wettability.

Example of a discontinuous printed cross. (un-wetting surface)

Example of a continuous printed cross. (wetting surface)

Angle to reach for optimum printing condition is less than 30°.

When substrate is not compatible you can modify the surface tension by using Corona treatment, plasma

oxygen, heating or coating inter-layer.

About wettability

PET Substrate With plasma treatment

PET Substrate Without plasma treatment

The same quantity of ink have been deposited before and after treatment on the PET film. The wettability has been considerably increased plasma treatment . © Sirris

Ag (Silver) Carbone nano tube (CNT) PEDOT Copper Gold ... A lot of ...

Substrate

PET PMMA Textile PEEK PC METAL ABS PE Paper Glass ....∞....

Substrate : Textile Ink : Silver

Substrate : Paper Ink : CNT

Substrate : Glass Ink : CNT

Substrate : Dielectric Ink : Silver

Substrate : PET Ink : Silver

Substrate : Paper Ink : Copper

Substrate : COC Ink : PEDOT

Substrate : PMMA Ink : Silver

Porous material paradigm

Due to the absorption effect, in the current paradigm, porous material are skipped when sensor have to be printed on. Since Sirris apply a specific method to avoid the absorption effect, then new paradigm to consider is that “Sensor could be printed on porous material”.

Absorption effect is lasting when the ink stays liquid. The idea is to reduce the liquid as soon as the ink is in contact with porous material. The idea is to work with HOT substrate (ideally at curing temperature)

PZT porous material

Porous material paradigm

Even with porous material and hot platen, the precision of printing could reach a very fine precision of printing by track with about 20µm Here is a example of inter-digitated sensor used for Ultra Sonic detection and (NDT field).

-1st layer ~ « planarization » - Subsequent ones fully functional

20 µm width, 2.5 µm thick tracks

Main issue: roughness and porosity of PZT Ra,PZT between 0.5 µm and 1.5µm

Flexible substrate

By the past : Withstanding Thick substrata inflexible Presently : Flexibility has to be done on thin film.

ρε y= crack % ε for the

same curvature thin is better for flexibility but worst for manipulation and robustness

Textile paradigm and conductive track

@eTextile DIY

The conductivity textile are commonly reached by adding a conductive fibber inside the textile. This “additional” part isn’t necessary by using selective deposition as shown here after

The new paradigm is to adapt the shape of the line in relation with substrate. Textile is flexible and globally rough. Then the shape of the line is to adapt to provide withstanding to the flexibility of the conductive track with the flexibility of textile.

Here is an example of the track printed on textile : New shape of track has been directly printed on textile and stays conductive

The new shape of the line is the new paradigm to consider to be compatible with selective deposition on textile

Textile paradigm and sensors

Once again, in the past, sensors have been considered as an additional part to integrated in the textile. The new paradigm is to consider that, as done for the conductive track, the sensor cold also be directly printed on textile as shown in the following example

CNT deposition on textile © Sirris

Textile paradigm and sensors

Results of the printed sensor shows the sensibility of the deposition to tensile load induced in the textile. We use a CNT ink which allow us to measure the load induced in the textile.

Tensile test induced through the roller

Tensile LOAD

3D part functionalizing paradigm

http://www.3d-mid.de/

The fictionalization of 3D part are usually done by Classical method of 3D-MID. One of the most popular is shown here attached.

Functionalizing 3D parts are possible by direct & selective deposition as for example by AJP

(1) A 3D substrate is created (2) The material is deposited according to a specific tool path

(3) The deposited material is then very locally sintered by laser

Video watch

Electroluminescent lighting

Electro luminescence is large surface lighting to the fine structure illumination by µPrinting of the rear electrode by AJP.

Printing Paradigm versus sintering methodology

Understanding sintering temperature need to understand what is the ink material compounded. Commercial inks could be nano particle composed. In case of nano particle, we have to consider that the sintering temperature is reduced due to the nano effect. Example : Silver ink could be sintered at 120-150°C (nano particle size about 1 30 nm). Compared to the bulk material sintering temperature at T° > 700°C, the reduction of the sintering temperature is considerably reduced !

Printing Paradigm versus sintering methodology

Heat oven sintering Laser Sintering Flash or photonic Sintering

Complete Substrate have to withstand to sintering temperature

The sintering temperature is done at room temperature. Only the very localised surface under the deposited ink track will be submitted to high temperature for a very short time. Then, this technology is suitable for low temperature substrate

Conclusion

“With selective deposition you have to think as ”never done before””

Electo luminescence

Thinking of the day !

Industrial companies are related to the world World is constantly changing and innovating

Then Company have to innovated

Then, new paradigm consideration, is pushing to Success

Thanks for your attention. Thank to the team.

www.small-lab.be www.sirris.be/AJP

Liege Science Park Rue du Bois Saint-Jean, 12

4102 – SERAING +32 (0)4 361 87 00

small@sirris.be

2012 10 15-sirris_µprinting_day

wetting surface

selective

conductive

thin film

sintering

absorption

paper substrate

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