Competing Interactions in DNA Assembly on Graphene

被引：81

作者：

Akca, Saliha ^{[1
]}

Foroughi, Ashkan ^{[1
]}

Frochtzwajg, Daniel ^{[1
]}

Postma, Henk W. Ch. ^{[1
]}

机构：

[1] Calif State Univ Northridge, Dept Phys & Astron, Northridge, CA 91330 USA

来源：

PLOS ONE | 2011年 / 6卷 / 04期

基金：

美国国家科学基金会;

关键词：

ORIENTED PYROLYTIC-GRAPHITE; ATOMIC-FORCE MICROSCOPY; WALLED CARBON NANOTUBES; SINGLE-STRANDED-DNA; ELECTRODE SURFACE; HOPG ELECTRODE; ADSORPTION; BINDING;

D O I：

10.1371/journal.pone.0018442

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We study the patterns that short strands of single-stranded DNA form on the top graphene surface of graphite. We find that the DNA assembles into two distinct patterns, small spherical particles and elongated networks. Known interaction models based on DNA-graphene binding, hydrophobic interactions, or models based on the purine/pyrimidine nature of the bases do not explain our observed crossover in pattern formation. We argue that the observed assembly behavior is caused by a crossover in the competition between base-base pi stacking and base-graphene pi stacking and we infer a critical crossover energy of 0.3-0.5 eV. The experiments therefore provide a projective measurement of the base-base interaction strength.

引用

页数：4

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