Dielectrophoretic trapping of DNA-coated gold nanoparticles on silicon based 
vertical nanogap devices

Strobel, S.; Sperling, R. A.; Fenk, B.; Parak, W. J.; Tornow, M.

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Dielectrophoretic trapping of DNA-coated gold nanoparticles on silicon based vertical nanogap devices

MPS-Authors

Fenk, B.
Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Strobel, S., Sperling, R. A., Fenk, B., Parak, W. J., & Tornow, M. (2011). Dielectrophoretic trapping of DNA-coated gold nanoparticles on silicon based vertical nanogap devices. Physical Chemistry Chemical Physics, 13(21), 9973-9977.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C17F-A

Abstract

We report on the successful dielectrophoretic trapping and electrical characterization of DNA-coated gold nanoparticles on vertical nanogap devices (VNDs). The nanogap devices with an electrode distance of 13 nm were fabricated from Silicon-on-Insulator (SOI) material using a combination of anisotropic reactive ion etching (RIE), selective wet chemical etching and metal thin-film deposition. Au nanoparticles (diameter 40 nm) coated with a monolayer of dithiolated 8 base pairs double stranded DNA were dielectrophoretically trapped into the nanogap from electrolyte buffer solution at MHz frequencies as verified by scanning and transmission electron microscopy (SEM/TEM) analysis. First electrical transport measurements through the formed DNA-Au-DNA junctions partially revealed an approximately linear current-voltage characteristic with resistance in the range of 2-4 G Omega when measured in solution. Our findings point to the importance of strong covalent bonding to the electrodes in order to observe DNA conductance, both in solution and in the dry state. We propose our setup for novel applications in biosensing, addressing the direct interaction of biomolecular species with DNA in aqueous electrolyte media.