Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange

Benjamin T. Diroll; Richard D Schaller

doi:10.1021/acs.chemmater.9b01261

Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange

Benjamin T. Diroll, Richard D Schaller

Northwestern University, Argonne National Laboratory

Research output: Contribution to journal › Article

Abstract

Treatment of CdSe nanoplatelets with halide salts induces a bathochromic shift in the absorption resonances that does not occur in quasi-spherical quantum dots of the same composition. The optical shifts are not strongly sensitive to the cation moiety, which may be organic or inorganic. The magnitude of the energy shift is largest for thinner nanoplatelets, with bathochromic shifts as large as 240 meV observed for 3 monolayer nanoplatelets. This effect is driven by a tetragonal distortion of the zinc blende lattice in response to ligand exchange. The expansion of the lattice in the shortest nanoplatelet axis results in the observed red-shifts due primarily to relaxation of quantum confinement, with secondary contributions from strain.

Original language	English
Journal	Chemistry of Materials
DOIs	https://doi.org/10.1021/acs.chemmater.9b01261
Publication status	Published - Jan 1 2019

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Quantum confinement

Semiconductor quantum dots

Cations

Zinc

Monolayers

Ion exchange

Salts

Positive ions

Ligands

Ions

Chemical analysis

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

Cite this

Diroll, B. T., & Schaller, R. D. (2019). Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange. Chemistry of Materials. https://doi.org/10.1021/acs.chemmater.9b01261

Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange. / Diroll, Benjamin T.; Schaller, Richard D.

In: Chemistry of Materials, 01.01.2019.

Research output: Contribution to journal › Article

Diroll, BT & Schaller, RD 2019, 'Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange', Chemistry of Materials. https://doi.org/10.1021/acs.chemmater.9b01261

Diroll BT, Schaller RD. Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange. Chemistry of Materials. 2019 Jan 1. https://doi.org/10.1021/acs.chemmater.9b01261

Diroll, Benjamin T. ; Schaller, Richard D. / Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange. In: Chemistry of Materials. 2019.

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10.1021/acs.chemmater.9b01261