Direct fabrication of CaWO₄ patterns on cellulose based organic substrates by on-site ink-jet reaction at room temperature

We have employed ink-jet reaction method for direct fabrication of calcium tungstate patterns with the minimum width of around 150 μm on cellulose based organic substrates without any post-firing and/or sintering. The XRD patterns revealed that the formed phase was a well-crystallized single phase of CaWO₄ without any other impurity phases and the crystallite size was about 20 ± 4 nm. The Raman spectra were further confirmed the fabricated patterns consisted of CaWO₄. The adhesion of CaWO₄ to the substrate was good and revealed by SEM observations. The patterned CaWO₄ showed the original blue luminescence when exposed to ultraviolet radiation (wavelength 254 nm) under dark room conditions at room temperature.