Nano-inks for printing electric circuits for microelectronics technology 

Andrzej E. Kinart ,  Andrzej J. Mościcki 

Amepox Microelectronics, Ltd. (AMEPOX-MC), Jaracza 6, Łódź 90-268, Poland

Abstract

The ink-jet is non-contact technique for production very complicate electronic patterns like conducting points, lines and even 3D structures for electronic applications. There are several important components of the ink-jet printing technology for electronic: the printing system, the conductive ink material and substrates.

The greatest challenge is the ink formulation, because these inks have to meet strict physicochemical properties: viscosity, surface tension, adhesion to a substrate, sintering temperature, etc. The most important is low viscosity and very homogeneous structure like molecular fluid with conductive nanosized particles. This type of fluids must be stable for a long time to avoid sedimentation during printing process and to achieve optimal performance and reliability of the printing system and obtain the best printed pattern.

Amepox Microelectronics developed two inks: high sintering temperature (230oC) with particles size 3-8 nm (Fig. 1a) - trade name AX JP-6n and low sintering temperature (150oC with particles size 50-60 nm (Fig. 1b) - trade name AX JP-60n.

Fig .1 A – Nanosilver 3-8 nm, B – Nanosilver 50-60nm 

The Inks have very high and stable electrical conductivity near value of pure silver. Inks natures (connected with molecular fluid properties) are perfectly homogeneous – fully uniform silver concentration in whole ink volume. This is also reason for very good repeatability of resistance and dispensed shapes: dots, lines, etc. The main technical parameters of the inks you can see in the Table 1.

Table1. Technical parameters of inks.

Ink

AX JP – 6n

AX JP – 60n

Consistency

Very low viscous ink

Very low viscous ink

Colour

Dark brown to black

Dark green to gray

Percentage of silver (inside ready paste)

40 – 60 %

20 % (with possibility up to 40%)

Viscosity

7.5 – 10.5 mPas (*)

5 – 6.5 mPas (*)

Thixotropy index (1/10 rpm)

~ 1.0

~ 1.0

Surface tension value

28.5 – 32.5 dynes/cm

~35 dynes/cm

Recommended curing & sintering conditions in convection oven

(220 – 230) °C – 60 min.

150 °C – 60 min.

Specific gravity

1,1-1,3 g/cm3

0,8-1,0 g/cm3

Eletrical resistivity

(4-6) x 10-6 Ωcm

5 x 10-6 Ωcm

Storage

2 months in refrigerator in temp. less 15°C (do not keep it in temp. less 5°C)

2 months in refrigerator in temp. less 15°C (do not keep it in temp. less 5°C)

(*)   - Brookfield LVDVII + CP; 100 rpm; 20°C.

 

 

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Presentation: Oral at Nano PL 2014, Symposium A, by Andrzej E. Kinart
See On-line Journal of Nano PL 2014

Submitted: 2014-10-06 12:18
Revised:   2014-10-06 12:18