Electrical conduction in 7 nm wires constructed on λ-DNA

We examine the morphological and electrical characteristics of nanowires fabricated on DNA templates via palladium (Pd) reduction. λ-DNA molecules were stretched and aligned on a mica surface using a molecular combing technique, followed by an electroless deposition of palladium, resulting in formation of nanowires with nominal width of 7 nm. We investigated the size distribution of nanowires with atomic force microscopy and made electrical connections to the wires by metal evaporation through multiple shadow masks. Electrical characterization of the nanowires under various bias conditions, variable temperature, and with different contact metal work functions revealed a conduction mechanism resembling that of granular metals.

[1]  Benjamin Abeles,et al.  Percolation Conductivity in W-Al 2 O 3 Granular Metal Films , 1975 .

[2]  N. Seeman,et al.  Synthesis from DNA of a molecule with the connectivity of a cube , 1991, Nature.

[3]  P. Schultz,et al.  Organization of 'nanocrystal molecules' using DNA , 1996, Nature.

[4]  E. Braun,et al.  DNA-templated assembly and electrode attachment of a conducting silver wire , 1998, Nature.

[5]  N. Seeman,et al.  Designed Two-Dimensional DNA Holliday Junction Arrays Visualized by Atomic Force Microscopy , 1999 .

[6]  Wolfgang Pompe,et al.  Nanoscale palladium metallization of DNA , 2000 .

[7]  Wolfgang Pompe,et al.  Construction of highly conductive nanowires on a DNA template , 2001 .

[8]  N. Seeman.  DNA in a material world , 2003, Nature.

[9]  J. Reif,et al.  DNA-Templated Self-Assembly of Protein Arrays and Highly Conductive Nanowires , 2003, Science.

[10]  Ralph G Nuzzo,et al.  Formation and structure of self-assembled monolayers of alkanethiolates on palladium. , 2003, Journal of the American Chemical Society.

[11]  Chengde Mao,et al.  DNA-Templated Fabrication of 1D Parallel and 2D Crossed Metallic Nanowire Arrays , 2003 .

[12]  E. Braun,et al.  DNA-Templated Carbon Nanotube Field-Effect Transistor , 2003, Science.

[13]  George M. Whitesides,et al.  Using self-assembly for the fabrication of nano-scale electronic and photonic devices , 2003 .

[14]  Fabrication of nanostructured palladium-doped SiO2 films with variable temperature coefficient of resistivity , 2004 .

[15]  C. Mao,et al.  Tensegrity: construction of rigid DNA triangles with flexible four-arm DNA junctions. , 2004, Journal of the American Chemical Society.

[16]  Russell P. Goodman,et al.  Rapid Chiral Assembly of Rigid DNA Building Blocks for Molecular Nanofabrication , 2005, Science.

[17]  Karin Musier-Forsyth,et al.  Sequence-encoded self-assembly of multiple-nanocomponent arrays by 2D DNA scaffolding. , 2005, Nano letters.

[18]  Chengde Mao,et al.  DNA-encoded self-assembly of gold nanoparticles into one-dimensional arrays. , 2005, Angewandte Chemie.