TY - JOUR
T1 - Thickness-Controlled Quasi-Two-Dimensional Colloidal PbSe Nanoplatelets
AU - Koh, Weon kyu
AU - Dandu, Naveen K.
AU - Fidler, Andrew F.
AU - Klimov, Victor I.
AU - Pietryga, Jeffrey M.
AU - Kilina, Svetlana V.
N1 - Funding Information:
W.-k.K. and J.M.P. were supported by the Los Alamos National Laboratory (LANL) LDRD program. A.F.F. and V.I.K were supported by the Center for Advanced Solar Photophysics (CASP), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences. N.D. and S.K. acknowledge the U.S. DOE (DE-SC008446) for financial support, and NERSC (DEAC02- 05CH11231) and the Center for Integrated Nanotechnology (LANL) for computational resources and facilities; a Sloan Research Fellowship BR2014-073 supported software license purchase. The authors thank Darrick J. Williams for SAXS analysis.
PY - 2017/2/15
Y1 - 2017/2/15
N2 - 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.
AB - 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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U2 - 10.1021/jacs.6b11945
DO - 10.1021/jacs.6b11945
M3 - Article
C2 - 28099009
AN - SCOPUS:85013042438
VL - 139
SP - 2152
EP - 2155
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 6
ER -