Thickness-Controlled Quasi-Two-Dimensional Colloidal PbSe Nanoplatelets

Weon kyu Koh; Naveen K. Dandu; Andrew F. Fidler; Victor I Klimov; Jeffrey M. Pietryga; Svetlana V. Kilina

doi:10.1021/jacs.6b11945

Thickness-Controlled Quasi-Two-Dimensional Colloidal PbSe Nanoplatelets

Weon kyu Koh, Naveen K. Dandu, Andrew F. Fidler, Victor I Klimov, Jeffrey M. Pietryga, Svetlana V. Kilina

Los Alamos National Laboratory

Research output: Contribution to journal › Article

11 Citations (Scopus)

Abstract

We demonstrate controlled synthesis of discrete two-dimensional (2D) PbSe nanoplatelets (NPLs), with measurable photoluminescence, via oriented attachment directed by quantum dot (QD) surface chemistry. Halide passivation is critical to the growth of these (100) face-dominated NPLs, as corroborated by density functional theory studies. PbCl₂ moieties attached to the (111) and (110) of small nanocrystals form interparticle bridges, aligning the QDs and leading to attachment. We find that a 2D bridging network is energetically favored over a 3D network, driving the formation of NPLs. Although PbI₂ does not support bridging, its presence destabilizes the large (100) faces of NPLs, providing means for tuning NPL thickness. Spectroscopic analysis confirms the predicted role of thickness-dependent quantum confinement on the NPL band gap.

Original language	English
Pages (from-to)	2152-2155
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	139
Issue number	6
DOIs	https://doi.org/10.1021/jacs.6b11945
Publication status	Published - Feb 15 2017

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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10.1021/jacs.6b11945

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Koh, W. K., Dandu, N. K., Fidler, A. F., Klimov, V. I., Pietryga, J. M., & Kilina, S. V. (2017). Thickness-Controlled Quasi-Two-Dimensional Colloidal PbSe Nanoplatelets. Journal of the American Chemical Society, 139(6), 2152-2155. https://doi.org/10.1021/jacs.6b11945

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abstract = "We demonstrate controlled synthesis of discrete two-dimensional (2D) PbSe nanoplatelets (NPLs), with measurable photoluminescence, via oriented attachment directed by quantum dot (QD) surface chemistry. Halide passivation is critical to the growth of these (100) face-dominated NPLs, as corroborated by density functional theory studies. PbCl2 moieties attached to the (111) and (110) of small nanocrystals form interparticle bridges, aligning the QDs and leading to attachment. We find that a 2D bridging network is energetically favored over a 3D network, driving the formation of NPLs. Although PbI2 does not support bridging, its presence destabilizes the large (100) faces of NPLs, providing means for tuning NPL thickness. Spectroscopic analysis confirms the predicted role of thickness-dependent quantum confinement on the NPL band gap.",

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AU - Koh, Weon kyu

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AU - Fidler, Andrew F.

AU - Klimov, Victor I

AU - Pietryga, Jeffrey M.

AU - Kilina, Svetlana V.

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