Ligand induced circular dichroism and circularly polarized luminescence in cdse quantum dots

Urice Tohgha, Kirandeep K. Deol, Ashlin G. Porter, Samuel G. Bartko, Jung Kyu Choi, Brian M. Leonard, Krisztina Varga, Jan Kubelka, Gilles Muller, Milan Balaz

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118 Citations (Scopus)

Abstract

Chiral thiol capping ligands l- and d-cysteines induced modular chiroptical properties in achiral cadmium selenide quantum dots (CdSe QDs). Cys-CdSe prepared from achiral oleic acid capped CdSe by postsynthetic ligand exchange displayed size-dependent electronic circular dichroism (CD) and circularly polarized luminescence (CPL). Opposite CPL signals were measured for the CdSe QDs capped with d- and l-cysteine. The CD profile and CD anisotropy varied with size of CdSe nanocrystals with largest anisotropy observed for CdSe nanoparticles of 4.4 nm. Magic angle spinning solid state NMR (MAS ssNMR) experiments suggested bidentate interaction between cysteine and the surface of CdSe. Time Dependent Density Functional Theory (TDDFT) calculations verified that attachment of l- and d-cysteine to the surface of model (CdSe)13 nanoclusters induces measurable opposite CD signals for the exitonic band of the nanocluster. The origin of the induced chirality is consistent with the hybridization of highest occupied CdSe molecular orbitals with those of the chiral ligand.

Original languageEnglish
Pages (from-to)11094-11102
Number of pages9
JournalACS Nano
Volume7
Issue number12
DOIs
Publication statusPublished - 2013 Dec 23

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Tohgha, U., Deol, K. K., Porter, A. G., Bartko, S. G., Choi, J. K., Leonard, B. M., Varga, K., Kubelka, J., Muller, G., & Balaz, M. (2013). Ligand induced circular dichroism and circularly polarized luminescence in cdse quantum dots. ACS Nano, 7(12), 11094-11102. https://doi.org/10.1021/nn404832f