Open AccessThickness-Controlled Quasi-Two-Dimensional Colloidal PbSe Nanoplatelets
Author(s) -
Weon-kyu Koh,
Naveen Dandu,
Andrew F. Fidler,
Victor I. Klimov,
Jeffrey M. Pietryga,
Svetlana Kilina
Publication year - 2017
Publication title -
journal of the american chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.115
H-Index - 612
eISSN - 1520-5126
pISSN - 0002-7863
DOI - 10.1021/jacs.6b11945
Subject(s) - passivation , bridging (networking) , photoluminescence , chemistry , nanocrystal , quantum dot , colloid , nanotechnology , band gap , density functional theory , halide , optoelectronics , chemical physics , inorganic chemistry , materials science , computational chemistry , computer network , organic chemistry , layer (electronics) , computer science
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. PbCl 2 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 PbI 2 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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