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 | |
| Publication status | Published - Feb 15 2017 |
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ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry
Cite this
Thickness-Controlled Quasi-Two-Dimensional Colloidal PbSe Nanoplatelets. / Koh, Weon kyu; Dandu, Naveen K.; Fidler, Andrew F.; Klimov, Victor I; Pietryga, Jeffrey M.; Kilina, Svetlana V.
In: Journal of the American Chemical Society, Vol. 139, No. 6, 15.02.2017, p. 2152-2155.Research output: Contribution to journal › Article
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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.
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.
UR - http://www.scopus.com/inward/record.url?scp=85013042438&partnerID=8YFLogxK
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U2 - 10.1021/jacs.6b11945
DO - 10.1021/jacs.6b11945
M3 - Article
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 -