Atomic structure and defect dynamics of monolayer lead iodide nanodisks with epitaxial alignment on graphene

Sinha, Sapna; Zhu, Taishan; France‐Lanord, Arthur; Sheng, Yuewen; Grossman, Jeffrey C.; Porfyrakis, Kyriakos; Warner, Jamie H.

doi:10.1038/s41467-020-14481-z

Cited by 38 publications

(31 citation statements)

References 69 publications

(67 reference statements)

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“…Our group utilized high‐angle annular dark‐field STEM (HAADF‐STEM) to show that monolayer lead iodide shows a preferential alignment and structural morphology on graphene, as shown in Figure 4e–f. [ 83 ] PbI 2 was observed to be energetically most stable in 1H structural phase when on top of graphene, instead of the otherwise reported 1T structural phase. In addition, we also showed that strong epitaxial alignment of PbI 2 monolayers with the underlying graphene lattice occurs, PbI 2 zigzag matching graphene arm‐chair direction, leading to a phase shift from the 1T to 1H structure to increase the level of commensuration in the two lattice spacings (PbI 2 and graphene).…”

Section: Microscopy With a Graphene Substratementioning

confidence: 53%

Recent Progress in Using Graphene as an Ultrathin Transparent Support for Transmission Electron Microscopy

Sinha

Warner

2021

Small Structures

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Transmission electron microscopy (TEM) has long been used as the ultimate characterization technique for nanomaterials at the atomic level. Herein, the importance of the use of graphene in TEM is also presented to introduce the properties that make it indispensable for the characterization of other nanomaterials and study their properties and van der Waals interactions. A broad overview of the importance of using TEM for the study of nanomaterials and the rise of graphene as a superior substrate for the study of different kinds of low‐dimensional materials is provided. A review of the study of morphology, properties, and behavior of a range of nanomaterials is presented, with a specific focus on how graphene facilitates these studies due to its unique influence and interaction with the specific materials under TEM. This review presents an overview of the various studies and characterization that have been carried out on a range of nanomaterials using TEM with the use of graphene, and discusses the future challenges and engineering applications.

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Section: Microscopy With a Graphene Substratementioning

confidence: 53%

Recent Progress in Using Graphene as an Ultrathin Transparent Support for Transmission Electron Microscopy

Sinha

Warner

2021

Small Structures

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Section: Resultsmentioning

confidence: 99%

“…The very bright round particles are impurities from graphene grown on Cu substrate (e.g., Cu, Cr, or Si) that are present on the graphene substrate before molecule deposition. [35,[39][40] The parallel contrast features observed consist of W-containing calix [4]azoarenes, and these lamellar structures are frequently observed in many areas of high density molecular depositions (Figure 2b,e-h). The power-spectrum of the fast Fourier transform (FFT) from the ADF-STEM image shows the average chain-to-chain spacing to be ≈2.5-2.7 nm (Figure 2c,d).…”

Section: Adf-stem Is the Clear Lamellar Packing Of Compounds As Seen Inmentioning

confidence: 93%

Self‐Assembly of Bowlic Supramolecules on Graphene Imaged at the Individual Molecular Level using Heavy Atom Tagging

Kengmana

Lee

et al. 2020

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The self‐assembly of bowlic supramolecules on graphene surface is studied with single molecular sensitivity. This is achieved by incorporating a heavy metal tag in the form of a single W atom into the tip of the molecular structure, which enables the direct imaging of molecular distribution using annular dark‐field scanning transmission electron microscopy (ADF‐STEM) along with graphene as an electron transparent support. The bowlic molecules have nonplanar geometry, and their orientations with respect to their graphene substrate and with each other result in various packing configurations. Statistical data on intermolecular distances is obtained from numerous measurements of the bright contrast from the single metal atom tags. The analysis shows that the bowlic molecules lie sideways on the graphene surface with favorable head‐to‐tail stacking, rather than sitting vertically with the bowl facing toward the graphene surface. In thicker film regions, nanoscale lamellar fringes are observed, demonstrating that large‐scale aligned packing extends into 3D. Image simulations and various molecular packing schemes are discussed to help interpret the ADF‐STEM images and the possible range of molecular interactions occurring. These results aid the understanding of nonplanar supramolecular assemblies on van der Waals surfaces for potential applications in molecular recognition by porous films.

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“…PbI 2 is an interesting compound because is a large bandgap 2D layered material that has potential for semiconductor applications ( Sinha et al, 2020 ) and, bearing heavy elements, could also be employed as contrast agent ( Hernández-Rivera et al, 2017 ). PbI 2 along with the other metal halides (ZnI 2 , CeI 3 ) employed in this study are layered structures, which can lead to the formation of tubular van der Waals heterostructures when confined within the cavities of MWCNTs ( Cabana et al, 2014 ; Sandoval et al, 2017 ; Sandoval et al, 2018 ).…”

Section: Discussionmentioning

confidence: 99%

Encapsulation of Fullerenes: A Versatile Approach for the Confinement and Release of Materials Within Open-Ended Multiwalled Carbon Nanotubes

Sandoval

2021

Front. Bioeng. Biotechnol.

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We have employed fullerenes as versatile agents to “cork” the open tips of multiwalled carbon nanotubes (MWCNTs), and as promoting species for the release of the inorganic material filled within the nanotubes’ cavities. High Z element compounds, namely, PbI2, ZnI2, and CeI3, were chosen to easily determine the presence of the filler inside the hosting nanotubes by transmission electron microscopy (TEM). Fullerenes can isolate inorganic nanostructures confined within the hollow cavities of MWCNTs, which allows the removal of the external material remnant after the filling. Otherwise, taking advantage of the affinity of fullerenes with selected solvents, we have confirmed the ability of the C60 molecules to promote the displacement of the inorganic guest from the host. We propose two different strategies to trigger the release, employing vapor and liquid phase treatments. The first protocol involves annealing filled MWCNTs in presence of fullerenes (to obtain C60PbI2@MWCNTs) and the subsequent washing of the sample in ethanol under mild conditions. On the other hand, the simultaneous introduction of the C60 molecules and the liberation of the guest are produced by a single step wet procedure; the latter being potentially useful when materials that are not stable at high temperatures are employed for filling.

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Atomic structure and defect dynamics of monolayer lead iodide nanodisks with epitaxial alignment on graphene

Cited by 38 publications

References 69 publications

Recent Progress in Using Graphene as an Ultrathin Transparent Support for Transmission Electron Microscopy

Recent Progress in Using Graphene as an Ultrathin Transparent Support for Transmission Electron Microscopy

Self‐Assembly of Bowlic Supramolecules on Graphene Imaged at the Individual Molecular Level using Heavy Atom Tagging

Encapsulation of Fullerenes: A Versatile Approach for the Confinement and Release of Materials Within Open-Ended Multiwalled Carbon Nanotubes

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