DNA origami and customized self-assembly

When the distance and relative position of two nanocrystals are fixed, they might exhibit new physicochemical properties. To investigate more about this and manipulate their arrangement, I chose DNA nanomaterials as a tool to program their assembly. 
Embedding spatial addressability onto inorganic nanocrystals for DNA-guided self-assembly  

I think for this project, a microscope image/graphic illustration says better than a thousand words. From the above you can tell I am doing some hieratical assembly of gold nanocrystals with different shape and sizes, and I figured out to bind them together with different symmetries. 

By wrapping the inorganic nanocrystals with a DNA origami sheet, we are able to imprint the molecular recognition ability of DNA origami onto inorganic particles with different shapes, sizes, and materials to form complex hybrid structures. Compared to most previous studies, our approach does not require complicated design of DNA origami or the involvement of  multiple functionalized DNA strands, making the fabrication process easier and more economical.   Using gold nanorods with different shapes as an example, we showed that it is feasible to synthesize multiple finite structures that are hard to achieve through traditional colloidal synthesis. The extension of this wrapping method to gold nanocrystals with different shapes and nanoparticles with other materials shows the generality of our approach and can potentially have impact on many related fields, including plasmonic sensors, medical imaging, and photovoltaics.   

This work is currently in preparation, please stay tuned for more update :)

Unlike my PhD works that were separated into a few projects, my postdoc mainly focus on this single project. Synthesizing an DNA origami sheet, synthesizing gold nanocrystals, surface functionalization of nanocrystals, their interaction, and eventually the higher order structures with finite pre-designed elements. 

Every single step you saw on the schematic illustration took me some time to figure out and optimize, but it was really a fun process. Despite being a PhD in the field of colloidal synthesis I still learned quite a lot about shape/size control of metal nanocrystals at my postdoc stage, and needless to say I learned a lot about DNA nanotechnology as I get involved in this area. 

Last updated: October 2024