Scientists at the Technical University of Madrid have
developed a cheap new method of manufacturing optical nanosensors that can
cling to curved surfaces.
The technique may allow for a widespread adoption of
skin-worn health monitoring devices for all-day tracking of parameters like
body temperature, heart rate, and physical activity.
These nanosensors enable us to measure refractive index
variations of the surrounding medium and this can be used to detect chemical
substances. Also, they display iridescent colors that can vary according to the
viewing and illumination angle. This property facilitates the detection of
position variations and surface topography to where they are stuck at a glance.
The creation method for flexible nanosensors consists,
firstly, on manufacturing sensors over a compact disc of traditional
polycarbonate. Secondly, transferring these sensors to adhesive Scotch tapes by
a simple stick-and-peel procedure. This way, the nanosensors go from the CD
surface to the adhesive tape (flexible substrate).