Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays

Korolkov, Vladimir V.; Baldoni, Matteo; Watanabe, Kenji; Taniguchi, Takashi; Besley, Elena; Beton, Peter H.

doi:10.1038/nchem.2824

Cited by 80 publications

(70 citation statements)

References 51 publications

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“…The AFM data show that the roughness of the InSe surface (up to 1 nm) is significantly larger than for the sapphire substrate (∼ ±0.1 nm). Also, it is larger than that of hBN, which has an abrupt and atomically smooth surface [82,83]. Thus the most likely reason for the imperfectness of the interface revealed in our experiments is the surface roughness of the InSe layer.…”

Section: B Elastic Properties Of Interfacesmentioning

confidence: 70%

Coherent acoustic phonons in van der Waals nanolayers and heterostructures

et al. 2018

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Terahertz (THz) and sub-THz coherent acoustic phonons have been successfully used as probes of various quantum systems. Since their wavelength is in the nanometer range, they can probe nanostructures buried below a surface with nanometer resolution and enable control of electrical and optical properties on a picosecond time scale. However, coherent acoustic phonons have not yet been widely used to study van der Waals (vdW) two-dimensional (2D) materials and heterostructures. This class of 2D systems features strong covalent bonding of atoms in the layer planes and weak van der Waals attraction between the layers. The dynamical properties of the interface between the layers or between a layer and its supporting substrate are often omitted as they are difficult to probe. On the other hand, these play a crucial role in interpreting experiments and/or designing new device structures. Here, we use picosecond ultrasonic techniques to investigate phonon transport in vdW InSe nanolayers and InSe/hBN heterostructures. Coherent acoustic phonons are generated and detected in these 2D systems and allow us to probe elastic parameters of different layers and their interfaces. In particular, our study of the elastic properties of the interface between vdW layers reveals a strong coupling over a wide range of frequencies up to 0.1 THz, offering prospects for high-frequency electronics and technologies that require control over the charge and phonon transport across an interface. In contrast, we reveal a weak coupling between the InSe nanolayers and sapphire substrates, relevant in thermoelectrics and sensing applications, which can require quasi-suspended layers.

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Section: B Elastic Properties Of Interfacesmentioning

confidence: 70%

Coherent acoustic phonons in van der Waals nanolayers and heterostructures

et al. 2018

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“…In analogy to molecular exchange and preferential adsorption processes after sequential deposition of two different ILs on Ag(111) [81,82], exchange processes have also been reported for organic bilayers on metals involving porphyrins and related aromatic molecules [156][157][158][159][160][161][162][163][164]. These investigations highlight the importance of the strength of the organic-metal interaction and its correlation to the stability and arrangement in stacked multilayer architectures [156,161,162,[164][165][166][167][168][169][170]. Although combinations of porphyrins and ILs were already realized for catalysis [171] and dye-sensitized solar cell technologies [40,41], dedicated interface studies of porphyrin/IL hybrid systems are still missing.…”

Section: Replacement Of Ionic Liquids By Porphyrins At Metal Interfacesmentioning

confidence: 72%

Ultrathin ionic liquid films on metal surfaces: adsorption, growth, stability and exchange phenomena

Lexow

Maier

Steinrück

2020

Advances in Physics: X

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The interface of ionic liquids (ILs) with solid surfaces is of pivotal interest for many applications, ranging from sensors, lubrication, separation technology, and electronics to electrochemistry and catalysis. We present a short review on ultrathin layers of ionic liquids on metal surfaces using a surface science approach. We mainly focus on specific examples of imidazolium-based ionic liquids on Ag(111) and Au(111) studied by angle-resolved X-ray photoelectron spectroscopy, and relate the obtained results to existing literature. We address a variety of phenomena on the molecular level, namely, (i) the adsorption, growth and wetting behavior of ILs, (ii) the thermal stability and desorption of ILs, (iii) exchange processes of anions and cations at the IL/solid interface, and (iv) the replacement of ILs from the IL/solid interface by porphyrins.

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“…[31][32][33][34][35] and various two-dimensional (2D) materials. [36][37][38] Like for other molecular assemblies at surfaces, the balance between molecule-substrate and intermolecular interactions is a central aspect in the design of carboxylic acid based structures. 2,9,36,[39][40][41][42][43][44][45][46][47][48] At the liquid/solid interface enthalpic and entropic contributions from the solvent also exert decisive influence on structures 20,40,[49][50][51][52] and the electrochemical potential represents an additional control parameter at electrified interfaces.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of 1,3,5-benzenetribenzoic acid on Ag and Cu at the liquid/solid interface

Aitchison

Morena

et al. 2018

Phys. Chem. Chem. Phys.

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Assembly of 1,3,5-benzenetribenzoic acid (H3BTB) from solution on Au substrates modified by underpotential deposited Ag and Cu layers was studied by near edge X-ray absorption fine structure spectroscopy, X-ray photoelectron spectroscopy and scanning tunneling microscopy. Adsorption of H3BTB on Cu resulted in disordered layers with sporadic occurrence of ordered molecular aggregates. In contrast, highly ordered layers were obtained on Ag which exhibit a pronounced row structure and involve a monopodal bidentate adsorption geometry of the molecules through carboxylate coordinating bonding. The row structure arises from π-stacking of the molecules and is accompanied by hydrogen bonding interactions between the COOH groups of adjacent rows. As a consequence of the geometry of the H3BTB molecule and the dominance of intermolecular over molecule-substrate interactions, the SAM forms an open structure featuring a grooved surface and nanotunnels.

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Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays

Cited by 80 publications

References 51 publications

Coherent acoustic phonons in van der Waals nanolayers and heterostructures

Coherent acoustic phonons in van der Waals nanolayers and heterostructures

Ultrathin ionic liquid films on metal surfaces: adsorption, growth, stability and exchange phenomena

Self-assembly of 1,3,5-benzenetribenzoic acid on Ag and Cu at the liquid/solid interface

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