DNA Base Pair Stacking Crystallization of Gold Colloids

Jaewon Lee, Ji Hyeok Huh, Seungwoo Lee

Research output: Contribution to journalArticle

Abstract

We describe a DNA base pair (bp) stacking driven 3D crystallization of 70-80 nm gold nanospheres (Au NSs) into a large-area, face-centered-cubic (FCC) lattice. Although great advances have been achieved over the past decade, DNA nanoparticle (NP) crystallization has relied solely on the base complementary binding. This limits the accessible crystal size particularly for the larger and heavier Au NPs (>50 nm). In this work, we argue that the use of DNA bp-stacking (so-called blunt-end stacking) instead of complementary binding can widen the scope of controlled interparticle interactions used to assemble larger Au colloids into a larger-area crystal. Through the optimization of the melting transition, relatively large Au NSs (e.g., 75 nm) with nearly ideal roundness can be crystallized into FCC crystals with the area of up to approximately 1400 μm2. A strong metallodielectric stopband is experimentally observed in the visible range, confirming the high quality of our self-assembled Au colloidal crystals.

Original languageEnglish
Pages (from-to)5118-5125
Number of pages8
JournalLangmuir
Volume36
Issue number19
DOIs
Publication statusPublished - 2020 May 19

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Fingerprint Dive into the research topics of 'DNA Base Pair Stacking Crystallization of Gold Colloids'. Together they form a unique fingerprint.

  • Cite this