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Conductive Copper Printing

Copprint - Conductivity for printed electronics

About Copprint

Copprint's Nano Copper Ink, a Game Changer for Printed Electronics.  

Copprint's Nano Copper Ink is a self-sintering alternative for high conductivity, low cost printed electronics. Our Nano Copper Ink is compatible with standard printing technologies, featuring rapid 2 second sintering by standard heating methods, and 50% bulk conductivity, with substantial cost reduction compared to silver ink.
Copprint's Nano Ink offers an affordable, conductive ink for a range of applications including: RFIDs printed on paper, touch panel bezel contacts, printed antennas, printed PCBs, heaters & defoggers, fabrics, 3D printing of conductive patterns, batteries and many other printed electronics applications.

Dr. Ofer Shochet


Ofer is an interdisciplinary entrepreneur and a technology visionary. Ofer is also a BOD member at Velo3D Inc. Ofer's previous roles include: EVP Products at Stratasys (nasdaq:SSYS) (2009-2014), founder of Navajo, a pioneer in SaaS security, (acquired by Salesforce.com), SVP at Verint (nasdaq:VRNT), founder and EVP of Vigil, and VP R&D at Silicon Graphics Biomedical. Ofer served five years at the Israeli intelligence corps and was awarded the prestigious Presidential Israel Security award.
Ofer holds a PhD and MSc (Magna cum Laude) in Physics from Tel Aviv University.

Dr. Ofer Shochet
CEO and Founder

Dr. Michael Grouchko


Michael is a world expert in Nano-conductive inks. Michael's PhD thesis was on Conductive Nano-Silver ink. Based on his academic work, nano-silver ink was commercialized for Xjet Solar and Nano-Dimension. Michael was Co-Founder and CTO of ClearJet which used inkjet-printed Nano-Silver rings to provide excellent conductivity and transparency for ITO replacement.
Michael holds a PhD, MSc, BSc in Chemistry from the Hebrew University of Jerusalem.

Dr. Michael Grouchko
CTO and Founder

Our first batch of Conductive Copper Ink

Just print and sinter for two seconds using a standard $200 office laminator.


Innovation

Until now, attempts to develop simple methods for the use of Copper inks have had limited success, as oxidation has undermined conductivity.

Copprint's patent pending Nano Inks enable oxidation free high conductivity copper printing, by rapid 2 second heating and sintering at 120-300°C (air environment, no capital investment - e.g. no need for photonic sintering or expensive lasers, environmental friendly).

Copprint inks enable high precision and full flexibility at all scales of printed electronics applications.

After Printing

This SEM image shows the copper nano particles which are about 80 nano-meter in size.

After printing and before sintering.
80 nanometer copper particles.

After sintering

After two seconds of sintering, large clusters of copper are created achieving high conductivity. Up to 50% bulk copper conductivity is achieved depending on the specific ink and sintering temperature.

After 2 seconds of Sintering
Sintering is performed using a $200 office laminator.

After sintering

After two seconds of sintering, large clusters of copper are created, achieving high conductivity. unlike directional sintering (e.g. photonic sintering) the sintered pattern is homogenous and the morphology of upper and lower parts are the same.

Homogenous sintering
SEM of a cross section of the printed pattern.
 

Why Copprint?

Substrate freedom

The Copprint Nano Ink supports rapid sintering. This allows working with a wide range of substrates as these are not negatively impacted by heating. For example, LF300 printed on paper at 300°C is possible, without burning. Copprint has successfully printed on multiple substrates, and in the future will release inks that support PET, PEN, Teslin, Kapton, FR4 and fabrics.

Low Cost

Copprint benefits combine reduced cost of the raw materials and the low cost of the sintering process. Copprint excels on both measures. Compared to silver inks, Copprint Nano Inks are substantially cheaper. Our sintering process does not require any photonic or laser sintering, and keeps electricity usage to a minimum. The sintering can be performed using standard heating solutions such as a $200 office laminator. This allows significant cost reduction, even relative to etching and die cutting.

Simplicity/Complexity of process

The Copprint Nano Ink printing process is very simple. The sintering equipment is inexpensive, robust and is not error prone, providing high yield printed electronics.

Environmental impact

The Copprint Nano Inks do not contain any hazardous materials and may be used everywhere. Unlike Alumium, PET or Silver that must be recycled, Copper based paper antenas can be composted, for a minimal ecological footprint.

Conductivity

The Copprint Nano Ink printing process results in highly conductive printed patterns. This implies material saving and an option to use in high voltage applications.

Robustness

The Copprint Nano Ink printing process yields robust conducitve elements. Printed RFID antennas passed more than 1000h at a 85°C/85RH test without any significant degradation. The printed parts also passed our bending tests - see video for our LF300 robustness below.

LF300 - Specs and advantages

Conductivity

  • Conductivity = 30% of bulk Copper
  • Sheet resistance = 2.3×10-3 Ω/□/mil
  • Resistivity = 5.6×10-8 Ω×m





Ink & Process parameters:
  • Viscosity = 5000 cP
  • % solids = 65%
  • Screen printed - 100 mesh PET screen.
  • Sintering conditions: 2 sec at 300°C
  • Suitable for many paper substrates
  • Typical dried printing thickness - 2-10 μm






Cost & process

LF300 is substantially cheaper than Silver based inks and provides similar or better conductivity.







The sintering process involves heating the printed pattern for a few seconds. In the video, we use a $200 standard office laminator for sintering, unlike competing processes which require prohibitively expensive photonic or laser sintering.

Substrate & Environmental impact

The Copprint process does not include hazardous materials and can be used everywhere.







Copper printed patterns on paper are compostable as the copper will decompose naturally, in landfills. Unlike Aluminum, PET or Silver that must be recycled, Copper based paper antenas can be composted.

Robustness

All printed conductive patterns demonstrate robustness with respect to accelerated environmental tests (upto 1000h at 85 °C / 85 RH) and bending tests as seen in the video.






Contact

Address
Antigonus 7 Jerusalem, 9330317, Israel