The original McDonald group page got lost, looking for the backups. In the meantime, here are some interesting images and links.
Apparently we're only the second group to do this in this particular way in the world. Most scanning probe methods involve either electrical current or displacement of surface species.
Since we don't use electrical current, we can do this on non-conductive substrates (like silane derivatized glass used above).
You can see evidence of the hysteresis of piezotubes in the big cross (right). During writing, the tip starts in the center of each cross, it writes the lower right arm first, comes back (2 passes), and writes the second line, this time making 4 total passes. It then makes 6 total passes over the upper left line, and 8 over the upper right. Done with this cross, the tip is moved across the sample by inertial translation and another cross is started.
We have also attached biotin and streptavidin coated gold nanoparticles to such lines. We have another scheme which could be used to place functional groups of many different kinds on the terminus of a surface assembly.