2-D Assembly of Quantum Dots directed by DNA Origami on Lithographical Patterns

 

Seung-Hyeon (Sarah) Ko and J. Alexander Liddle

 

The central goal of nanotechnology is to control and organize matter at the nanometer scale.  Nanomanufacturing requires that this be done in volume and cost effectively.  Standard integrated circuit fabrication techniques can only be used for products with a similar cost structure.  New methods are needed for other, lower cost per unit area applications. A viable pathway to this end may be the integration of DNA self-assembly with top-down lithography techniques. 

Organizing metallic nanoparticles in a controlled manner is of great interest in nanoelectronics and nanophotonics/plasmonics. DNA has been actively used as a template for the assembly of nanoparticles with nano-scale precision. However, when DNA templates are annealed in solution and loaded onto a substrate, DNA tends to adsorb randomly. Controlled deposition of DNA templates with high selectivity and placement accuracy on a substrate would open a range of more practical applications.  To achieve this, we are devising methods to attach QDs to specific locations on DNA origami and to attach the origami to specific locations on a substrate. DNA origami carrying quantum dots will be adsorbed on lithographically pre-patterned and chemically differentiated Si surfaces.