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Lawrence KN, Johnson MA, Dolai S, et al. Solvent-like ligand-coated ultrasmall cadmium selenide nanocrystals: strong electronic coupling in a self-organized assembly. Nanoscale. 2015;7(27):11667-77doi: 10.1039/c5nr02038g.
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), 11667-77. https://doi.org/10.1039/c5nr02038g
Lawrence, Katie N, et al. "Solvent-like ligand-coated ultrasmall cadmium selenide nanocrystals: strong electronic coupling in a self-organized assembly." Nanoscale vol. 7,27 (2015): 11667-77. doi: https://doi.org/10.1039/c5nr02038g
Lawrence KN, Johnson MA, Dolai S, Kumbhar A, Sardar R. Solvent-like ligand-coated ultrasmall cadmium selenide nanocrystals: strong electronic coupling in a self-organized assembly. Nanoscale. 2015 Jul 21;7(27):11667-77. doi: 10.1039/c5nr02038g. Epub 2015 Jun 22. PMID: 26098759.
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Nanoscale. 2015 Jul 21;7(27):11667-77. doi: 10.1039/c5nr02038g. Epub 2015 Jun 22.

Solvent-like ligand-coated ultrasmall cadmium selenide nanocrystals: strong electronic coupling in a self-organized assembly.

Nanoscale

Katie N Lawrence, Merrell A Johnson, Sukanta Dolai, Amar Kumbhar, Rajesh Sardar

Affiliations

  1. Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, 402 N. Blackford Street, Indianapolis, Indiana 46202, USA. [email protected].

PMID: 26098759 DOI: 10.1039/c5nr02038g

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.

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