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

Research output: Contribution to journalArticle

111 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

Fingerprint

cysteine
Dichroism
Semiconductor quantum dots
dichroism
Cysteine
Luminescence
Ligands
quantum dots
luminescence
cadmium selenides
ligands
Nanoclusters
nanoclusters
Cadmium
Anisotropy
anisotropy
Magic angle spinning
oleic acid
Oleic acid
Chirality

All Science Journal Classification (ASJC) codes

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

Cite this

Tohgha, U., Deol, K. K., Porter, A. G., Bartko, S. G., Choi, J. K., Leonard, B. M., ... 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
Tohgha, Urice ; Deol, Kirandeep K. ; Porter, Ashlin G. ; Bartko, Samuel G. ; Choi, Jung Kyu ; Leonard, Brian M. ; Varga, Krisztina ; Kubelka, Jan ; Muller, Gilles ; Balaz, Milan. / Ligand induced circular dichroism and circularly polarized luminescence in cdse quantum dots. In: ACS Nano. 2013 ; Vol. 7, No. 12. pp. 11094-11102.
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Tohgha, U, Deol, KK, Porter, AG, Bartko, SG, Choi, JK, Leonard, BM, Varga, K, Kubelka, J, Muller, G & Balaz, M 2013, 'Ligand induced circular dichroism and circularly polarized luminescence in cdse quantum dots', ACS Nano, vol. 7, no. 12, pp. 11094-11102. https://doi.org/10.1021/nn404832f

Ligand induced circular dichroism and circularly polarized luminescence in cdse quantum dots. / Tohgha, Urice; Deol, Kirandeep K.; Porter, Ashlin G.; Bartko, Samuel G.; Choi, Jung Kyu; Leonard, Brian M.; Varga, Krisztina; Kubelka, Jan; Muller, Gilles; Balaz, Milan.

In: ACS Nano, Vol. 7, No. 12, 23.12.2013, p. 11094-11102.

Research output: Contribution to journalArticle

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AU - Muller, Gilles

AU - Balaz, Milan

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N2 - 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.

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Tohgha U, Deol KK, Porter AG, Bartko SG, Choi JK, Leonard BM et al. Ligand induced circular dichroism and circularly polarized luminescence in cdse quantum dots. ACS Nano. 2013 Dec 23;7(12):11094-11102. https://doi.org/10.1021/nn404832f