In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals

J.J. Geuchies; C. van Overbeek; W.H. Evers; Bart Goris; Annick de Backer; A.P. Gantapara; F.T. Rabouw; J. Hilhorst; J.L. Peters; Oleg Konovalov; Andrei V. Petukhov; M. Dijkstra; Laurens D A Siebbeles; S. Van Aert; Sara Bals; D.A.M. Vanmaekelbergh

doi:10.1038/nmat4746

In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals

J.J. Geuchies, C. van Overbeek, W.H. Evers, Bart Goris, Annick de Backer, A.P. Gantapara, F.T. Rabouw, J. Hilhorst, J.L. Peters, Oleg Konovalov, Andrei V. Petukhov, M. Dijkstra, Laurens D A Siebbeles, S. Van Aert, Sara Bals, D.A.M. Vanmaekelbergh^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Oriented attachment of PbSe nanocubes can result in the formation of two-dimensional (2D) superstructures with long-range nanoscale and atomic order1,2. This questions the applicability of classic models in which the superlattice grows by first forming a nucleus, followed by sequential irreversible
attachment of nanocrystals3,4, as one misaligned attachment would disrupt the 2D order beyond repair. Here, we demonstrate the formation mechanism of 2D PbSe superstructures with square geometry by using in situ grazing-incidence X-ray scattering (small angle and wide angle), ex situ electron microscopy, and Monte Carlo simulations. We observed nanocrystal adsorption at the liquid/gas interface, followed by the formation of a hexagonal nanocrystal monolayer. The hexagonal geometry transforms gradually through a pseudo-hexagonal phase into a phase with square order, driven by attractive interactions between the {100} planes perpendicular to the liquid substrate, which maximize facetto-
facet overlap. The nanocrystals then attach atomically via a necking process, resulting in 2D square superlattices.

Original language	English
Pages (from-to)	1248-1254
Number of pages	7
Journal	Nature Materials
Volume	15
Issue number	12
DOIs	https://doi.org/10.1038/nmat4746
Publication status	Published - Dec 2016

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Geuchies, J. J., van Overbeek, C., Evers, W. H., Goris, B., de Backer, A., Gantapara, A. P., Rabouw, F. T., Hilhorst, J., Peters, J. L., Konovalov, O., Petukhov, A. V., Dijkstra, M., Siebbeles, L. D. A., Van Aert, S., Bals, S., & Vanmaekelbergh, D. A. M. (2016). In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals. Nature Materials, 15(12), 1248-1254. https://doi.org/10.1038/nmat4746

@article{3826c68241cd4e39bad4d268899d32bc,

title = "In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals",

abstract = "Oriented attachment of PbSe nanocubes can result in the formation of two-dimensional (2D) superstructures with long-range nanoscale and atomic order1,2. This questions the applicability of classic models in which the superlattice grows by first forming a nucleus, followed by sequential irreversibleattachment of nanocrystals3,4, as one misaligned attachment would disrupt the 2D order beyond repair. Here, we demonstrate the formation mechanism of 2D PbSe superstructures with square geometry by using in situ grazing-incidence X-ray scattering (small angle and wide angle), ex situ electron microscopy, and Monte Carlo simulations. We observed nanocrystal adsorption at the liquid/gas interface, followed by the formation of a hexagonal nanocrystal monolayer. The hexagonal geometry transforms gradually through a pseudo-hexagonal phase into a phase with square order, driven by attractive interactions between the {100} planes perpendicular to the liquid substrate, which maximize facetto-facet overlap. The nanocrystals then attach atomically via a necking process, resulting in 2D square superlattices.",

author = "J.J. Geuchies and {van Overbeek}, C. and W.H. Evers and Bart Goris and {de Backer}, Annick and A.P. Gantapara and F.T. Rabouw and J. Hilhorst and J.L. Peters and Oleg Konovalov and Petukhov, {Andrei V.} and M. Dijkstra and Siebbeles, {Laurens D A} and {Van Aert}, S. and Sara Bals and D.A.M. Vanmaekelbergh",

year = "2016",

month = dec,

doi = "10.1038/nmat4746",

language = "English",

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journal = "Nature Materials",

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Geuchies, JJ, van Overbeek, C, Evers, WH, Goris, B, de Backer, A, Gantapara, AP, Rabouw, FT, Hilhorst, J, Peters, JL, Konovalov, O, Petukhov, AV , Dijkstra, M, Siebbeles, LDA, Van Aert, S, Bals, S & Vanmaekelbergh, DAM 2016, 'In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals', Nature Materials, vol. 15, no. 12, pp. 1248-1254. https://doi.org/10.1038/nmat4746

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T1 - In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals

AU - Geuchies, J.J.

AU - van Overbeek, C.

AU - Evers, W.H.

AU - Goris, Bart

AU - de Backer, Annick

AU - Gantapara, A.P.

AU - Rabouw, F.T.

AU - Hilhorst, J.

AU - Peters, J.L.

AU - Konovalov, Oleg

AU - Petukhov, Andrei V.

AU - Dijkstra, M.

AU - Siebbeles, Laurens D A

AU - Van Aert, S.

AU - Bals, Sara

AU - Vanmaekelbergh, D.A.M.

PY - 2016/12

Y1 - 2016/12

N2 - Oriented attachment of PbSe nanocubes can result in the formation of two-dimensional (2D) superstructures with long-range nanoscale and atomic order1,2. This questions the applicability of classic models in which the superlattice grows by first forming a nucleus, followed by sequential irreversibleattachment of nanocrystals3,4, as one misaligned attachment would disrupt the 2D order beyond repair. Here, we demonstrate the formation mechanism of 2D PbSe superstructures with square geometry by using in situ grazing-incidence X-ray scattering (small angle and wide angle), ex situ electron microscopy, and Monte Carlo simulations. We observed nanocrystal adsorption at the liquid/gas interface, followed by the formation of a hexagonal nanocrystal monolayer. The hexagonal geometry transforms gradually through a pseudo-hexagonal phase into a phase with square order, driven by attractive interactions between the {100} planes perpendicular to the liquid substrate, which maximize facetto-facet overlap. The nanocrystals then attach atomically via a necking process, resulting in 2D square superlattices.

AB - Oriented attachment of PbSe nanocubes can result in the formation of two-dimensional (2D) superstructures with long-range nanoscale and atomic order1,2. This questions the applicability of classic models in which the superlattice grows by first forming a nucleus, followed by sequential irreversibleattachment of nanocrystals3,4, as one misaligned attachment would disrupt the 2D order beyond repair. Here, we demonstrate the formation mechanism of 2D PbSe superstructures with square geometry by using in situ grazing-incidence X-ray scattering (small angle and wide angle), ex situ electron microscopy, and Monte Carlo simulations. We observed nanocrystal adsorption at the liquid/gas interface, followed by the formation of a hexagonal nanocrystal monolayer. The hexagonal geometry transforms gradually through a pseudo-hexagonal phase into a phase with square order, driven by attractive interactions between the {100} planes perpendicular to the liquid substrate, which maximize facetto-facet overlap. The nanocrystals then attach atomically via a necking process, resulting in 2D square superlattices.

U2 - 10.1038/nmat4746

DO - 10.1038/nmat4746

M3 - Article

SN - 1476-1122

VL - 15

SP - 1248

EP - 1254

JO - Nature Materials

JF - Nature Materials

IS - 12

ER -

In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals

Abstract

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