ISSS Public Lecture 9 Prof Wim 2020:ULTRASONICSPRAY COATING

Solution deposition techniques allow the deposition of thin
films at atmospheric pressure and ambient temperatures. A
direct advantage of this is the absence of high temperatures
and near vacuum pressures that allow the use of flexible
substrates such as PET, textile or paper. One of the techniques
that have a huge potential for large area deposition of
functional materials is Ultrasonic spray coating. This
deposition technology has virtually no limitation in substrate
size and a low utilization of material allows to engineer
the thin film deposition by manipulating the tunable spray
coating parameters. In this presentation we will cover the
fundamentals of ultrasonic droplet generation and transport
towards the substrate and the interaction and flow behavior
on the substrate to achieve homogeneous coatings. We
will show the deposition of nanoparticles from very small
size (5nm) to sizes up to micrometer range and also the
deposition of polymer based inks and combinations of
both on substrates such as glass, foils and even 3D-printed
substrates. Applications range from diamond deposition (5nm
nano-particles), over P3HT-PCBM nanoparticles (~100nm)
for organic photovoltaic and molecular imprinted polymer
particles (~1µm) for biosensing applications. Functional
coatings with polymers to achieve organic light emitting
devices and finally superhydrophobic coatings on 3D printed
substrates will conclude the presentation.