| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 176953 | Dyes and Pigments | 2012 | 8 Pages |
Novel pigments, consisting of Au–Ag mixed nanoparticles, were developed for digital decoration by ink-jet printing of ceramic wares. Special attention was paid to set up a microwave assisted synthesis route, with a low environmental impact, easily transferable to large-scale production. Several suspensions, based on Au, Ag and Au–Ag mixed nanoparticles were prepared, trying to get a core-shell assemblage, and the synthesis parameters like metal concentration, Ag/Au ratio, time, temperature and chelating agent amount were optimized. The suspensions are stable over many months and a total reaction yield, assessed by ICP-AES analysis, was achieved. Particle size, shape, composition and optical properties were measured by DLS, TEM-EDS, XRD and UV–VIS spectroscopy. The so-prepared inks were applied on ceramic tiles simulating the ceramic process and the colour performance, assessed by colourimetry, were expressed in the CIELab parameters.
► AuAg core-shell nanosuspensions are synthesized by using a microwave assisted route. ► The synthesis is eco-friendly and easily transferable to large scale production. ► Prepared systems are suitable as red inks for digital decoration on ceramic wares. ► Nanosuspensions show high stability, total reaction yield and lots of red shades. ► The chance of reducing Au content in favour of Ag represents a great cost advantage.
