High resolution LAPS and SPIM
High resolution was achieved by using silicon-on-sapphire as the
semiconductor substrate and by using a two-photon effect in silicon.
Organic monolayers were introduced as the insulator to improve the
sensitivity and accuracy of SPIM and LAPS.
Organic monolayers obtained by reacting 1,8-nonadiyne with the
H-terminated silicon surface can easily be modified by copper
catalysed click chemistry. The method was adapted for
microcontact printing for patterning surfaces with functional
groups. Photocurrent images of the patterned samples clearly
show an increase in the photocurrent due to the positive surface
charge of the -NH2 modified surface
Polyelectrolyte microcapsules modified with gold nanoparticles
were produced using a layer-by-layer technique.
The gold-modified microcapsules were deposited and collapsed on
the sensor surface. SPIM images show the local variation in
impedance in great detail.