Modulating the Bond Strength of DNA-Nanoparticle Superlattices

Soyoung E. Seo, Mary X. Wang, Chad M. Shade, Jessica L. Rouge, Keith A. Brown, Chad A. Mirkin

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A method is introduced for modulating the bond strength in DNA-programmable nanoparticle (NP) superlattice crystals. This method utilizes noncovalent interactions between a family of [Ru(dipyrido[2,3-a:3′,2′-c]phenazine)(N-N)2]2+-based small molecule intercalators and DNA duplexes to postsynthetically modify DNA-NP superlattices. This dramatically increases the strength of the DNA bonds that hold the nanoparticles together, thereby making the superlattices more resistant to thermal degradation. In this work, we systematically investigate the relationship between the structure of the intercalator and its binding affinity for DNA duplexes and determine how this translates to the increased thermal stability of the intercalated superlattices. We find that intercalator charge and steric profile serve as handles that give us a wide range of tunability and control over DNA-NP bond strength, with the resulting crystal lattices retaining their structure at temperatures more than 50°C above what nonintercalated structures can withstand. This allows us to subject DNA-NP superlattice crystals to conditions under which they would normally melt, enabling the construction of a core-shell (gold NP-quantum dot NP) superlattice crystal.

Original languageEnglish (US)
Pages (from-to)1771-1779
Number of pages9
JournalACS nano
Volume10
Issue number2
DOIs
StatePublished - Feb 23 2016
Externally publishedYes

Keywords

  • crystallization
  • DNA
  • DNA intercalator
  • nanoparticle
  • self-assembly

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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