Self-Assembled Single-Stranded DNA Nano-Networks in Solution and at Surfaces.

Journal Article (Journal Article)

We studied the directed self-assembly of two types of complementary single-stranded DNA (ssDNA) strands [i.e., poly(dA) and poly(dT)] into more complex, organized, and percolating networks in dilute solutions and at surfaces. Understanding ssDNA self-assembly into 2D networks on surfaces is important for the use of such networks in the fabrication of well-defined nanotechnological devices, as, for instance, required in nanoelectronics or for biosensing. To control the formation of 2D networks on surfaces, it is important to know whether DNA assemblies are formed already in dilute solutions or only during the drying/immobilization process at the surface, where the concentration automatically increases. Fluorescence cross-correlation spectroscopy clearly shows the presence of larger DNA complexes in mixed poly(dA) and poly(dT) solutions already at very low DNA concentrations (<1 nM), that is, well below the overlap concentration. Here, we describe for the first time such supramolecular complexes in solution and how their structure depends on the ssDNA length and concentration and ionic strength. Hence, future attempts to control such networks should also focus on network precursors in solution and not only on their immobilization on surfaces.

Full Text

Duke Authors

Cited Authors

  • Simon, M; Prause, A; Zauscher, S; Gradzielski, M

Published Date

  • February 17, 2022

Published In

PubMed ID

  • 35176851

Electronic International Standard Serial Number (EISSN)

  • 1526-4602

International Standard Serial Number (ISSN)

  • 1525-7797

Digital Object Identifier (DOI)

  • 10.1021/acs.biomac.1c01493

Language

  • eng