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Particle-free gold metal–organic decomposition ink for inkjet printing of gold structures

: Schoner, C.; Tuchscherer, A.; Blaudeck, T.; Jahn, S.F.; Baumann, R.R.


Thin solid films 531 (2013), S.147-151
ISSN: 0040-6090
Fraunhofer ENAS ()

The application of liquid [AuO2CCH2(OCH2CH2)2OCH3(nBu3P)] (1) as a metal–organic decomposition ink containing 34.2 wt.% of gold is reported. Chemical and physical properties of 1 are discussed. The ink formulated of 20 wt.% of 1 in toluene (gold concentration 6.9 wt.%) exhibits rheological properties well-suited for piezo inkjet printing. Conversion into electrically conductive gold was accomplished by thermal treatment optimized to provide best possible conductivity, contour accuracy, and layer homogeneity.

The thermal decomposition of 1 was studied by thermogravimetry–mass spectrometry coupling experiments. It was found that at first decarboxylation takes place forming [AuCH2(OCH2CH2)2OCH3(PnBu3)], further heating cleaves the Ausingle bondP bond and releases PnBu3. This resulting compound decomposes via Ausingle bondC, Csingle bondC and Csingle bondO bond cleavage processes giving gold and appropriate organics (CxHyOz (x ≥ 3)). The printed features exhibit conductivities of up to 1.9 × 107 S·m− 1 on glass which corresponds to 43% of bulk gold conductivity.