Abstract:
A low cost, room temperature curable alumina
ink has been prepared by non-aqueous route. The ink is
printed on flexible biaxially-oriented polyethylene terephthalate
(BoPET) substrate as well as on photographic
paper. The dielectric constant of the printed alumina on
BoPET film is found to be 3.29 and 3.26 at 5 and 15 GHz
respectively with a dielectric loss of the order of 10–3. The
printed alumina layer (without substrate) has a dielectric
constant of 4.54 and loss tangent 0.010 at 15 GHz. The
temperature coefficient of dielectric constant for alumina
ink with BoPET substrate and alumina ink with photographic
paper are 60 and 66 ppm/ C respectively. The
variation of dielectric constant and loss tangent with the
thickness of the printed layer is also investigated. The
results indicate that the alumina dielectric ink can be used
as a potential candidate for future printed electronic
applications
