PHYS 417 |
| Redox-gradient dendrimers (RGDs) are being developed as single molecule charge storage units for probe-based information storage media. Mixed polymer and RGD films have been spin-coated onto SiO2/Si substrates. Charging of local regions by atomic force microscopy (AFM) is accomplished by application of a tip voltage bias at the AFM probe. The resulting film surface morphology is monitored by tapping AFM and surface potential mapped by Kelvin probe microscopy (KPM). RGDs can be selectively charged in the polymer matrix by tapping AFM, and a dilution effect study shows the observation of single molecule charge domains. The charge diffusion features and charge lifetimes in neat and mixed films have been investigated. Probe-based writing, erasing, and rewriting of molecular charges in mixed films have been demonstrated and will be presented.
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PHYS Poster Session - Nanostructured Materials and Nanophotonics
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster
Division of Physical Chemistry |
