Archive for May, 2010
Controlled growth of ZnO nanowires using microcontact printing
by Mikhail Ladanov on May.25, 2010, under SEM pictures
I was posting some time ago about microcontact printing of seeding layer for controlled growth of the ZnO nanowires. Here we go. The first sample and I can see some lines of ZnO NW growing on the substrate.
Strange sphere
by Mikhail Ladanov on May.25, 2010, under SEM pictures
This is just some strange looking sphere, probably ZnO, that I bumped into while investigating one of my samples.
The Hedgehog
by Mikhail Ladanov on May.25, 2010, under SEM pictures
This is a cluster of ZnO nanowires. For ZnO NW to grow one generally need to create a seeding layer consisting of nanocrystalline ZnO. It can be done by depositing solution of zinc acetate in ethanol and annealing substrate at 300°C. If there is a particle on the surface of the substrate, surface tension can draw the solution to this particle, leaving area around without any seeding layer. In my opinion this “hedgehog” was formed around such a particle, while the area around it is without any ZnO NW. there are nanwires of expected shape and geometry father away from this structure.
