Solvent-like ligand-coated ultrasmall cadmium selenide nanocrystals: Strong electronic coupling in a self-organized assembly
dc.contributor.author | Lawrence, Katie N. | |
dc.contributor.author | Johnson, Merrell A. | |
dc.contributor.author | Dolai, Sukanta | |
dc.contributor.author | Kumbhar, Amar | |
dc.contributor.author | Sardar, Rajesh | |
dc.contributor.department | Department of Chemistry & Chemical Biology, School of Science | en_US |
dc.date.accessioned | 2016-08-23T19:37:29Z | |
dc.date.available | 2016-08-23T19:37:29Z | |
dc.date.issued | 2015-07 | |
dc.description.abstract | Strong inter-nanocrystal electronic coupling is a prerequisite for delocalization of exciton wave functions and high conductivity. We report 170 meV electronic coupling energy of short chain poly(ethylene glycol) thiolate-coated ultrasmall (<2.5 nm in diameter) CdSe semiconductor nanocrystals (SNCs) in solution. Cryo-transmission electron microscopy analysis showed the formation of a pearl-necklace assembly of nanocrystals in solution with regular inter-nanocrystal spacing. The electronic coupling was studied as a function of CdSe nanocrystal size where the smallest nanocrystals exhibited the largest coupling energy. The electronic coupling in spin-cast thin-film (<200 nm in thickness) of poly(ethylene glycol) thiolate-coated CdSe SNCs was studied as a function of annealing temperature, where an unprecedentedly large, ∼400 meV coupling energy was observed for 1.6 nm diameter SNCs, which were coated with a thin layer of poly(ethylene glycol) thiolates. Small-angle X-ray scattering measurements showed that CdSe SNCs maintained an order array inside the films. The strong electronic coupling of SNCs in a self-organized film could facilitate the large-scale production of highly efficient electronic materials for advanced optoelectronic device application. | en_US |
dc.eprint.version | Author's manuscript | en_US |
dc.identifier.citation | Lawrence, K. N., Johnson, M. A., Dolai, S., Kumbhar, A., & Sardar, R. (2015). Solvent-like ligand-coated ultrasmall cadmium selenide nanocrystals: strong electronic coupling in a self-organized assembly. Nanoscale, 7(27), 11667–11677. http://doi.org/10.1039/C5NR02038G | en_US |
dc.identifier.uri | https://hdl.handle.net/1805/10764 | |
dc.language.iso | en | en_US |
dc.publisher | RSC | en_US |
dc.relation.isversionof | 10.1039/C5NR02038G | en_US |
dc.relation.journal | Nanoscale | en_US |
dc.rights | Publisher Policy | en_US |
dc.source | Author | en_US |
dc.subject | electronic coupling | en_US |
dc.subject | semiconductor nanocrystals | en_US |
dc.title | Solvent-like ligand-coated ultrasmall cadmium selenide nanocrystals: Strong electronic coupling in a self-organized assembly | en_US |
dc.type | Article | en_US |