| 초록 |
With the advent of DNA-directed methods to form “single crystal” nanoparticle superlattices, new opportunities for studying the properties of such structures across many length scales now exist. Although DNA-programmed colloidal crystals consistently form thermodynamically favored Wulff shapes, the crystals are of size and shape polydispersity, a serious limitation for many applications. In addition, DNA hybridization is basically mutual hydrogen bonds which are sensitive to the environments (salt concentration, solvent, and temperature), and the weak linkage between particles limits in-depth characterizations and practical use of the DNA-assembled colloidal crystals. This presentation will discuss methods to overcome these problems for the DNA-engineered colloidal crystals to be synthesized more reliably; a density-layer approach with a quenching sublayer enhances the size and shape uniformity, and a post-synthetic treatment with Ag+ ions greatly increases the structural stability. |
