Scope and goals of research project:
The concept of using ferroelectric templates for nano-patterning through selective molecular deposition is based on utilizing the local surface electronic properties, which can be controlled by switching the direction of spontaneous polarization with an external electric field and through manipulation of the surface. We propose to explore the use of ferroelectric surface potentials and surface charges for an exciting and unique set of applications, including local molecular self-assembly, local physical adsorption/desorption, local chemical reactions, local charge transfer reactions, and the manipulation of individual organic molecules. We believe these unique surfaces can be utilized as writable and re-usable templates for nanoscience and technology.
Fabrication of nanoscale domain patterns will be performed by a direct write process using a conductive SPM tip in contact with ferroelectric surfaces terminated as described above. Briefly, arrays of domains will be written into the template by applying an electric field between the conductive SPM tip and a bottom electrode to selected points on the surface. Note that the sample does not have a deposited top electrode. This configuration creates a situation favoring generation of a single domain nucleus at the sample-tip contact location, which can then extend in lateral and forward direction for a limited distance. The size of the written domain is determined by the lateral and vertical distribution of the tip-generated electric field. |
