Spin-crossover nanoparticles anchored on MoS2 layers for heterostructures with tunable strain driven by thermal or light-induced spin switching

Torres‐Cavanillas, Ramón; Morant‐Giner, Marc; Escorcia‐Ariza, Garin; Dugay, Julien; Canet‐Ferrer, Josep; Tatay, Sergio; Cardona‐Serra, Salvador; Giménez‐Marqués, Mónica; Galbiati, Marta; Forment‐Aliaga, Alicia; Coronado, Eugenio

doi:10.1038/s41557-021-00795-y

Cited by 58 publications

(68 citation statements)

References 76 publications

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“…The deconvoluted high-resolution XPS spectra [ 27 , 28 ], of major elements in Rb 3 Ti 3 P 5 O 20 crystal are shown in Figure 4 b–e. The binding energy (BE) values and the BE difference of the constituent elements of the title compound are presented in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

Growth, Structure and Optical Characterization of Rb3Ti3P5O20 Single Crystal

et al. 2022

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Phosphate crystals attract much attention on account of their rich crystal structures and excellent physical and chemical properties. Herein, Rb3Ti3P5O20 single crystals were grown by the high temperature solution method using Rb2CO3 and NH4H2PO4 as the fluxes. This crystal, with non-centrosymmetric Pca21 space group, presents a three-dimensional framework structure composed of [TiO6] octahedron, [PO4] tetrahedra, and [P2O7] dimers. The electronic structure was measured via X-ray photoelectron spectroscopy. The measurements found that Rb3Ti3P5O20 has stronger Ti–O ionic bonding properties and weaker P–O covalent bonding properties compared to RbTiOPO4. Optical measurements indicated that Rb3Ti3P5O20 has a 3.54 eV band gap and a wide transmission range (0.33–4.5 μm). Theoretical calculations showed that Rb3Ti3P5O20 crystals have a moderate birefringence of 0.079 at 1064 nm. In addition, the relationship of the structure–property was studied using first-principles method. The results demonstrated that TiO6 octahedron played a significant role for the optical properties.

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Section: Resultsmentioning

confidence: 99%

Growth, Structure and Optical Characterization of Rb3Ti3P5O20 Single Crystal

et al. 2022

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“…The Fe 2p spectrum (Figure 5b) contains two asymmetric peaks due to the spin-orbit splitting, which can be assigned to Fe 2p 3/2 at 711.0 eV and Fe 2p 1/2 at 724.7 eV. Both Fe 2p 3/2 and Fe 2p 1/2 peaks can be further deconvoluted into two sub-peaks Fe 2+ (2p 3/2 at 710.0 eV, 2p 1/2 at 723.6 eV) and Fe 3+ (2p 3/2 at 711.8 eV, 2p 1/2 at 725.4 eV) [23]. Satellite peaks can be detected at 715.9 and 719.5 eV for Fe 2+ 2p 3/2 and Fe 3+ 2p 3/2 , respectively.…”

Section: Sem (Figurementioning

confidence: 98%

Magnetism of Tetragonal β-Fe3Se4 Nanoplates Controllably Synthesized by Thermal Decomposition of (β-Fe2Se3)4[Fe(tepa)] Hybrid

et al. 2022

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We report magnetism of tetragonal β-Fe3Se4 nanoplates controllably synthesized by thermal decomposition at 603 K of inorganic–organic (β-Fe2Se3)4[Fe(tepa)] hybrid nanoplates (tepa = tetraethylenepentamine). (β-Fe2Se3)4[Fe(tepa)] hybrid precursor and β-Fe3Se4 nanoplates are in single crystal features as characterized by selected area electron diffraction. Rietveld refinements reveal that ordered inorganic–organic (β-Fe2Se3)4[Fe(tepa)] hybrid nanoplates are in a tetragonal layered crystal structure with a space group of I4cm (108) and room-temperature lattice parameters are a = 8.642(0) Å and c = 19.40(3) Å, while the as-synthetic tetragonal β-Fe3Se4 nanoplates have a layered crystal structure with the P4/nmm space group, and room-temperature lattice parameters are a = 3.775(8) Å and c = 5.514(5) Å. Magnetic measurements show the weak ferrimagnetism for (β-Fe2Se3)4[Fe(tepa)] hybrid nanoplates at room temperature, while the as-synthetic β-Fe3Se4 nanoplates are antiferromagnetic in a temperature range between 120 and 420 K but in a ferrimagnetic feature below ~120 K. The as-synthetic β-Fe3Se4 nanoplates are thermally instable, which are transformed to ferrimagnetic β-Fe3Se4 nanoplates by annealing at 623 K (a little higher than the synthetic temperature). There is an irreversible change from antiferromagnetism of the as-synthetic β-Fe3Se4 phase to the ferrimagnetism of the as-annealed β-Fe3Se4 phase in a temperature between 420 and 470 K. Above 470 K, the tetragonal β-Fe3Se4 phase transforms to monoclinic Fe3Se4 phase with a Curie temperature (TC) of ~330 K. This discovery highlights that crystal structure and magnetism of Fe-Se binary compounds are highly dependent on both their phase compositions and synthesis procedures.

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“…[ 11 ] In fact, the interplay between the SCO and 2D materials is currently under debate, being its origin attributed to different effects as chemo‐electric gating, [ 7 ] modulation of the doping level, [ 8 ] spin‐dependent polarizability, [ 9 ] or strain effects. [ 10 ]…”

Section: Introductionmentioning

confidence: 99%

“…As pointed above, the SCO phenomenon has been used to induce strain in 2D materials by linking in solution SCO nanoparticles on MoS 2 flakes. [ 10 ] Here, we introduce a novel technique for triggering strain on 2D materials by using thin SCO van der Waals layers. Current state‐of‐the‐art regarding strain engineering on 2D materials includes the thermal variation or bending of the substrate where the 2D material is located, [ 12–15 ] inducing ripples and bubbles, [ 16,17 ] applying hydrostatic pressure, [ 18,19 ] or the use of piezoelectric and microheater actuators, [ 20–22 ] among others.…”

Section: Introductionmentioning

confidence: 99%

“…So far, just graphene grown by chemical vapor deposition or liquid exfoliated MoS 2 nanolayers have been combined with sublimated or drop‐cast SCO nanomaterials. [ 7–10 ] While these previous approaches benefit of its easy fabrication process and scalability in terms of performing devices, they lack of the conceptual simplicity of a vdWH, being not possible to change at will the stacking sequence of the different layers involved. [ 11 ] In fact, the interplay between the SCO and 2D materials is currently under debate, being its origin attributed to different effects as chemo‐electric gating, [ 7 ] modulation of the doping level, [ 8 ] spin‐dependent polarizability, [ 9 ] or strain effects.…”

Section: Introductionmentioning

confidence: 99%

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Strain Switching in van der Waals Heterostructures Triggered by a Spin‐Crossover Metal–Organic Framework

et al. 2022

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Van der Waals heterostructures (vdWHs) provide the possibility of engineering new materials with emergent functionalities that are not accessible in another way. These heterostructures are formed by assembling layers of different materials used as building blocks. Beyond inorganic 2D crystals, layered molecular materials remain still rather unexplored, with only few examples regarding their isolation as atomically thin layers. Here, the family of van der Waals heterostructures is enlarged by introducing a molecular building block able to produce strain: the so‐called spin‐crossover (SCO). In these metal–organic materials, a spin transition can be induced by applying external stimuli like light, temperature, pressure, or an electric field. In particular, smart vdWHs are prepared in which the electronic and optical properties of the 2D material (graphene and WSe2) are clearly switched by the strain concomitant to the spin transition. These molecular/inorganic vdWHs represent the deterministic incorporation of bistable molecular layers with other 2D crystals of interest in the emergent fields of straintronics and band engineering in low‐dimensional materials.

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Spin-crossover nanoparticles anchored on MoS2 layers for heterostructures with tunable strain driven by thermal or light-induced spin switching

Cited by 58 publications

References 76 publications

Growth, Structure and Optical Characterization of Rb3Ti3P5O20 Single Crystal

Growth, Structure and Optical Characterization of Rb3Ti3P5O20 Single Crystal

Magnetism of Tetragonal β-Fe3Se4 Nanoplates Controllably Synthesized by Thermal Decomposition of (β-Fe2Se3)4[Fe(tepa)] Hybrid

Strain Switching in van der Waals Heterostructures Triggered by a Spin‐Crossover Metal–Organic Framework

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