title: Defined-size DNA triple crossover construct for molecular electronics: modification, positioning and conductance properties.
abstract: We present a novel, defined-size, small and rigid DNA template, a so-called B-A-B complex, based on DNA triple crossover motifs (TX tiles), which can be utilized in molecular scale patterning for nanoelectronics, plasmonics and sensing applications. The feasibility of the designed construct is demonstrated by functionalizing the TX tiles with one biotin-triethylene glycol (TEG) and efficiently decorating them with streptavidin, and furthermore by positioning and anchoring single thiol-modified B-A-B complexes to certain locations on a chip via dielectrophoretic trapping. Finally, we characterize the conductance properties of the non-functionalized construct, first by measuring DC conductivity and second by utilizing AC impedance spectroscopy in order to describe the conductivity mechanism of a single B-A-B complex using a detailed equivalent circuit model. This analysis also reveals further information about the conductivity of DNA structures in general.
authors: Nanoscience Center, Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Finland. veikko.linko@jyu.fi
authors: Veikko
authors: V
authors: Linko
authors: Jenni
authors: J
authors: Leppiniemi
authors: Seppo-Tapio
authors: ST
authors: Paasonen
authors: Vesa P
authors: VP
authors: Hytönen
authors: J Jussi
authors: JJ
authors: Toppari