Templated and Hierarchical Assembly of CdSe/ZnS Quantum Dots


  • This work was supported by the Research Corporation, the David and Lucile Packard Foundation, the NASA Institute for Nanoelectronics and Computing, the NSF under Award CHE-0349302, and start-up funds from Northwestern University. We thank the Hupp lab for use of their spectrophotometer and Stefan Kaemmer from Digital Instruments for help in acquiring SNOM images.


original image

CdSe/ZnS nanocrystals have been assembled into mesoscale structures (see Figure). Templates with dimensions down to 100 nm are generated via phase-shifting photolithography using composite poly(dimethylsiloxane) masks. Upon removal of the template, the CdSe/ZnS structures are found to exhibit hierarchical order over square nanometers (self-assembly of nanocrystals), square micrometers (template shape), and square centimeters (arrays of template pattern).