Fig. 1

Schematic of DNA hybridization on gold and SWCNT-functionalized surfaces. a Surface attachment of probe-DNA with a thiol group at the 5′ end directly to the gold-coated glass surface and subsequent hybridization using cDNA and nCDNA. 2-ME is used as component in surface functionalization to prevent any possible nonspecific adsorption of probe-DNA. b Attachment of probe-DNA with an amine group at the 5′ end to the -COOH-functionalized VASWCNTs on the cysteamine/2-ME-modified gold surface and corresponding hybridization using cDNA and nCDNA