Scanning tunneling spectrosopy study of DNA conductivity

• Authors: Irena Kratochvílová , Karel Král , Martin Bunček , Stanislav Nešpůorek , Tatiana Todorciuc , Martin Weiter , Jiři Navrátil , Bohdan Schneider , Jiři Pavluch
• Languages of publication: EN

Abstracts

EN

We used STM to study the conductivity of 32 nucleotide long DNA molecules chemically attached to a gold surface. Two oligonucleotides containing all four base types namely G, A, C, T, one single stranded and one double helical, all showed conductance data significantly higher than DNA containing only T and A that were either single stranded d(T32) or double helical d(T32).d(A32) in confirmation. Within each sequence group, the conductivity of the double helical form was always higher than that of the single strand. We discuss the impact of structure, particular base stacking and affinity to the phase transition.

Keywords

EN

molecular electronics; DNA; scanning tunneling microscopy; conductivity; charge carrier transport

Discipline

• 87.14.gk: DNA
• 81.07.-b: Nanoscale materials and structures: fabrication and characterization(for structure of nanoscale materials, see 61.46.-w; for nanostructured materials in electrochemistry, see 82.45.Yz; see also 62.23.-c Structural classes of nanoscale systems in mechanical properties of condensed matter)
• 81.07.Nb: Molecular nanostructures
• 81.40.Rs: Electrical and magnetic properties related to treatment conditions

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2008
• Volume: 6
• Issue: 3
• Pages: 422-426

Dates

published

1 - 9 - 2008

online

17 - 7 - 2008

Contributors

author

Irena Kratochvílová

• Institute of Physics, AS-CR, v.v.i., Na Slovance 2, 182 21, Prague, Czech Republic

author

Karel Král

• Institute of Physics, AS-CR, v.v.i., Na Slovance 2, 182 21, Prague, Czech Republic

author

Martin Bunček

• Institute of Physics, AS-CR, v.v.i., Na Slovance 2, 182 21, Prague, Czech Republic

author

Stanislav Nešpůorek

• Institute of Macromolecular Chemistry, AS-CR, v.v.i., Heyrovský sq. 2, 16206, Prague, Czech Republic

author

Tatiana Todorciuc

• Institute of Macromolecular Chemistry, AS-CR, v.v.i., Heyrovský sq. 2, 16206, Prague, Czech Republic

author

Martin Weiter

• Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic

author

Jiři Navrátil

• Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic

author

Bohdan Schneider

• Institute of Organic Chemistry and Biochemistry, AS-CR, v.v.i., Fleming sq. 2, 166 10, Prague, Czech Republic

author

Jiři Pavluch

• Faculty of Mathematics and Physics, Charles University in Prague, V Holešovièkách 2, 180 00, Prague, Czech Republic

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Identifiers

DOI

10.2478/s11534-008-0072-7