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Real-Time In Situ Observation of CsPbBr3 Perovskite Nanoplatelets Transforming into Nanosheets

Prabhakaran, Aarya ; Dang, Zhiya ; Dhall, Rohan ; Camerin, Fabrizio LU orcid ; Marín-Aguilar, Susana ; Dhanabalan, Balaji ; Castelli, Andrea ; Brescia, Rosaria ; Manna, Liberato and Dijkstra, Marjolein , et al. (2023) In ACS Nano 17(14). p.13648-13658
Abstract

The manipulation of nano-objects through heating is an effective strategy for inducing structural modifications and therefore changing the optoelectronic properties of semiconducting materials. Despite its potential, the underlying mechanism of the structural transformations remains elusive, largely due to the challenges associated with their in situ observations. To address these issues, we synthesize temperature-sensitive CsPbBr3 perovskite nanoplatelets and investigate their structural evolution at the nanoscale using in situ heating transmission electron microscopy. We observe the morphological changes that start from the self-assembly of the nanoplatelets into ribbons on a substrate. We identify several paths of merging... (More)

The manipulation of nano-objects through heating is an effective strategy for inducing structural modifications and therefore changing the optoelectronic properties of semiconducting materials. Despite its potential, the underlying mechanism of the structural transformations remains elusive, largely due to the challenges associated with their in situ observations. To address these issues, we synthesize temperature-sensitive CsPbBr3 perovskite nanoplatelets and investigate their structural evolution at the nanoscale using in situ heating transmission electron microscopy. We observe the morphological changes that start from the self-assembly of the nanoplatelets into ribbons on a substrate. We identify several paths of merging nanoplates within ribbons that ultimately lead to the formation of nanosheets dispersed randomly on the substrate. These observations are supported by molecular dynamics simulations. We correlate the various paths for merging to the random orientation of the initial ribbons along with the ligand mobility (especially from the edges of the nanoplatelets). This leads to the preferential growth of individual nanosheets and the merging of neighboring ones. These processes enable the creation of structures with tunable emission, ranging from blue to green, all from a single material. Our real-time observations of the transformation of perovskite 2D nanocrystals reveal a route to achieve large-area nanosheets by controlling the initial orientation of the self-assembled objects with potential for large-scale applications.

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publishing date
type
Contribution to journal
publication status
published
keywords
in situ heating, in situ TEM, perovskite nanoplatelets, self-assembly, shape transformation
in
ACS Nano
volume
17
issue
14
pages
11 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85164956622
  • pmid:37406164
ISSN
1936-0851
DOI
10.1021/acsnano.3c02477
language
English
LU publication?
no
additional info
Publisher Copyright: © 2023 The Authors. Published by American Chemical Society.
id
9de75cc3-d991-475b-b9d0-edd36cd2d195
date added to LUP
2024-02-22 14:00:46
date last changed
2024-06-17 04:52:25
@article{9de75cc3-d991-475b-b9d0-edd36cd2d195,
  abstract     = {{<p>The manipulation of nano-objects through heating is an effective strategy for inducing structural modifications and therefore changing the optoelectronic properties of semiconducting materials. Despite its potential, the underlying mechanism of the structural transformations remains elusive, largely due to the challenges associated with their in situ observations. To address these issues, we synthesize temperature-sensitive CsPbBr<sub>3</sub> perovskite nanoplatelets and investigate their structural evolution at the nanoscale using in situ heating transmission electron microscopy. We observe the morphological changes that start from the self-assembly of the nanoplatelets into ribbons on a substrate. We identify several paths of merging nanoplates within ribbons that ultimately lead to the formation of nanosheets dispersed randomly on the substrate. These observations are supported by molecular dynamics simulations. We correlate the various paths for merging to the random orientation of the initial ribbons along with the ligand mobility (especially from the edges of the nanoplatelets). This leads to the preferential growth of individual nanosheets and the merging of neighboring ones. These processes enable the creation of structures with tunable emission, ranging from blue to green, all from a single material. Our real-time observations of the transformation of perovskite 2D nanocrystals reveal a route to achieve large-area nanosheets by controlling the initial orientation of the self-assembled objects with potential for large-scale applications.</p>}},
  author       = {{Prabhakaran, Aarya and Dang, Zhiya and Dhall, Rohan and Camerin, Fabrizio and Marín-Aguilar, Susana and Dhanabalan, Balaji and Castelli, Andrea and Brescia, Rosaria and Manna, Liberato and Dijkstra, Marjolein and Arciniegas, Milena P.}},
  issn         = {{1936-0851}},
  keywords     = {{in situ heating; in situ TEM; perovskite nanoplatelets; self-assembly; shape transformation}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{14}},
  pages        = {{13648--13658}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Nano}},
  title        = {{Real-Time In Situ Observation of CsPbBr<sub>3</sub> Perovskite Nanoplatelets Transforming into Nanosheets}},
  url          = {{http://dx.doi.org/10.1021/acsnano.3c02477}},
  doi          = {{10.1021/acsnano.3c02477}},
  volume       = {{17}},
  year         = {{2023}},
}