Porphyrin based molecular units have a unique set of properties and have been used for a variety of applications across many fields. In terms of electron transport, porphyrin-based oligomers have shown interesting properties in molecular junctions, such as long polaron delocalization length and low attenuation in electrical measurements. These unique properties, along with the ability to tune molecular properties with metal center and theoretical evidence of unique spintronic properties, motivate us to use these molecules for spintronic studies.<br/><br/>This talk will summarize our work incorporating multi[(porphinato)metal] oligomers into molecular junctions and studying their electronic and spintronic properties. We will show the viability of incorporating porphyrin oligomers into ‘bulk’ electrical junctions via nanotransfer printing (nTP) that show the same unique electrical output as single molecule junctions. Utilizing both diamagnetic (Zn) and paramagnetic (Cu, Ni, Fe) metal centers, we will also show a dependence of electrical transport on metal center, showing that changing metal center can change resistance of junctions by almost two orders of magnitude as well as change the nature of the observed charge transport. Furthermore, we will show our work incorporating porphyrin oligomers into molecular junctions to measure their spintronic properties. Using graphene as a tunnel barrier, robust, large area junctions can be fabricated to study molecular systems. We use these graphene-based junctions to inject spin through porphyrin oligomers and explore the spintronic properties of this unique and tunable molecular system.

Tunable electronic and spintronic properties in highly conjugated multi[(porphinato)metal] oligomers

249th National Meeting (2015)

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