Distortion of DNA Origami on Graphene Imaged with Advanced TEM Techniques

Yoones Kabiri, Adithya N. Ananth, Jaco van der Torre, Allard Katan, Jin Yong Hong, Sairam Malladi, Jing Kong, Henny Zandbergen, Cees Dekker

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
23 Downloads (Pure)

Abstract

While graphene may appear to be the ultimate support membrane for transmission electron microscopy (TEM) imaging of DNA nanostructures, very little is known if it poses an advantage over conventional carbon supports in terms of resolution and contrast. Microscopic investigations are carried out on DNA origami nanoplates that are supported onto freestanding graphene, using advanced TEM techniques, including a new dark-field technique that is recently developed in our lab. TEM images of stained and unstained DNA origami are presented with high contrast on both graphene and amorphous carbon membranes. On graphene, the images of the origami plates show severe unwanted distortions, where the rectangular shape of the nanoplates is significantly distorted. From a number of comparative control experiments, it is demonstrated that neither staining agents, nor screening ions, nor the level of electron-beam irradiation cause this distortion. Instead, it is suggested that origami nanoplates are distorted due to hydrophobic interaction of the DNA bases with graphene upon adsorption of the DNA origami nanoplates.

Original languageEnglish
Article number1700876
Pages (from-to)1-8
Number of pages8
JournalSmall
Volume13
Issue number31
DOIs
Publication statusPublished - 18 Aug 2017

Keywords

  • DNA origami
  • graphene
  • nanostructures
  • transmission electron microscopy

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