Materials Science & Engineering Colloquium
Date: February 08, 2008 from 2:00 pm to 3:00 pm EST
Location: 214 S. W. Mudd
Contact: For further information regarding this event, please contact Chad Gurley by sending email to cg2029@columbia.edu or by calling 47860.
Info: Click Here to Visit Website.
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"Molecular memory circuits on a nanoscale scaffold"
 
by Dr. Amy Blum, Research Chemist, Naval Research Laboratory
 
Significant challenges exist in assembling the building blocks of a nanoscale device. Self-assembly is one of the few practical strategies for making ensembles of nanostructures and will therefore be an essential part of nanotechnology. In order to generate complex structures through self-assembly, it is essential to develop methods by which different components in solution can come together in an ordered fashion. Using viruses as nanoscale scaffolds for devices offers the promise of exquisite control over positioning nanoscale components on a protein scaffold that also allows further self assembly of the nanoscale devices. Using Cowpea Mosaic Virus, modified to express cysteine residues on the capsid exterior, gold nanoparticles were attached to the viral scaffold in a pattern to produce specific interparticle distances. The nanoparticles were then interconnected using thiol-terminated conjugated organic molecules that can act as "molecular wires", resulting in a three-dimensional spherical conductive network which is only 30 nm in diameter. By using molecules that exhibit bistable voltage controlled switching, molecular memory circuits were assembled and characterized.