Exfoliation of Calcium Germanide by Alkyl Halides

Šturala, Jiří; Matějková, Stanislava; Plutnar, Jan; Hartman, Tomáš; Pumera, Martin; Sofer, Zdeněk

doi:10.1021/acs.chemmater.9b03391

Cited by 26 publications

(37 citation statements)

References 43 publications

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“…The low-intensity, broad peak at 13.3° is assigned to the (002) plane of hydrogenated germanene that indicates an interlayer spacing of 3.34 Å. Contrary to previously published results, 53 this spacing is very close to the distance between non-functionalized bilayered germanene 24,28 and refers to its low-level hydrogenation that occurred at the edges. The peaks at 26.0° and 27.4° scattering angles are assigned to the (100) and (111 ) diffraction reflection, respectively.…”

Section: Methodscontrasting

confidence: 75%

Edge-Hydrogenated Germanene by Electrochemical Decalcification-Exfoliation of CaGe2: Germanene-Enabled Vapor Sensor

Kovalska

Antonatos²,

Sofer³

2021

Preprint

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<p><a>Two-dimensional germanene has been recently explored for applications in sensing, catalysis, and energy storage. The potential of this material lies on its graphene-like optoelectronic and chemical properties. However, pure free-standing germanene cannot be found in nature and the synthetic methods are hindering the potentially fascinating properties of germanene. </a>Herein, <a>we report for the first time a single-step synthesis of few-layer germanene by electrochemical exfoliation in non-aqueous environment. As a result of simultaneous decalcification and intercalation of the electrolyte’s active ions, we achieved a low-level hydrogenation of germanene that occurs at the edges of the material. The obtained edge-hydrogenated germanene flakes have a lateral size of several micrometers which possess a cubic structure. We have pioneered the potential application of edge-hydrogenated germanene for vapor sensing and demonstrated its specific sensitivity to methanol and ethanol. We have shown a selective behavior of the germanene-based sensor that appears to increase the electrical resistance in the vapors where methanol prevails. We anticipate that these results can provide a new approach for emerging layered materials with the potential utility in advanced gas sensing.</a></p>

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Section: Methodscontrasting

confidence: 75%

Edge-Hydrogenated Germanene by Electrochemical Decalcification-Exfoliation of CaGe2: Germanene-Enabled Vapor Sensor

Kovalska

Antonatos²,

Sofer³

2021

Preprint

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“…In this regard, the main technique in the manufacture of two-dimensional (2D) materials is the peeling of layered bulk crystals to produce few-layer flakes or monolayer (single-layer), and it has become the best method in the fabrication of high-quality sheet for several applications 7 , 8 . There is a large number of monolayers that used in nanodevices, catalysis, field-effect transistors, batteries, hydrogen evolution, and supercapacitors are based on the exfoliated layered materials, for example but not limited to, and 9 , 10 , and 11 , 12 , 13 , CaGe 14 , and 15 , 16 . The importance of these thin-layer or single-layers is that they can be considered as the starting materials for further manipulation of size and shape to produce custom geometries for nanostructures potentially useful for quantum computers, spintronics, electrothermal computing, and optoelectronics 17 – 20 .…”

Section: Introductionmentioning

confidence: 99%

Ab initio prediction of semiconductivity in a novel two-dimensional Sb2X3 (X= S, Se, Te) monolayers with orthorhombic structure

Bafekry

Mortazavi

Fadlallah

et al. 2021

Sci Rep

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Abstract$$\hbox {Sb}_2\hbox {S}_3$$ Sb 2 S 3 and $$\hbox {Sb}_2\hbox {Se}_3$$ Sb 2 Se 3 are well-known layered bulk structures with weak van der Waals interactions. In this work we explore the atomic lattice, dynamical stability, electronic and optical properties of $$\hbox {Sb}_2\hbox {S}_3$$ Sb 2 S 3 , $$\hbox {Sb}_2\hbox {Se}_3$$ Sb 2 Se 3 and $$\hbox {Sb}_2\hbox {Te}_3$$ Sb 2 Te 3 monolayers using the density functional theory simulations. Molecular dynamics and phonon dispersion results show the desirable thermal and dynamical stability of studied nanosheets. On the basis of HSE06 and PBE/GGA functionals, we show that all the considered novel monolayers are semiconductors. Using the HSE06 functional the electronic bandgap of $$\hbox {Sb}_2\hbox {S}_3$$ Sb 2 S 3 , $$\hbox {Sb}_2\hbox {Se}_3$$ Sb 2 Se 3 and $$\hbox {Sb}_2\hbox {Te}_3$$ Sb 2 Te 3 monolayers are predicted to be 2.15, 1.35 and 1.37 eV, respectively. Optical simulations show that the first absorption coefficient peak for $$\hbox {Sb}_2\hbox {S}_3$$ Sb 2 S 3 , $$\hbox {Sb}_2\hbox {Se}_3$$ Sb 2 Se 3 and $$\hbox {Sb}_2\hbox {Te}_3$$ Sb 2 Te 3 monolayers along in-plane polarization is suitable for the absorption of the visible and IR range of light. Interestingly, optically anisotropic character along planar directions can be desirable for polarization-sensitive photodetectors. Furthermore, we systematically investigate the electrical transport properties with combined first-principles and Boltzmann transport theory calculations. At optimal doping concentration, we found the considerable larger power factor values of 2.69, 4.91, and 5.45 for hole-doped $$\hbox {Sb}_{{2}}\hbox {S}_{{3}}$$ Sb 2 S 3 , $$\hbox {Sb}_{{2}}\hbox {Se}_{{3}}$$ Sb 2 Se 3 , and $$\hbox {Sb}_{{2}}\hbox {Te}_{{3}}$$ Sb 2 Te 3 , respectively. This study highlights the bright prospect for the application of $$\hbox {Sb}_2\hbox {S}_3$$ Sb 2 S 3 , $$\hbox {Sb}_2\hbox {Se}_3$$ Sb 2 Se 3 and $$\hbox {Sb}_2\hbox {Te}_3$$ Sb 2 Te 3 nanosheets in novel electronic, optical and energy conversion systems.

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“…X-ray diffraction (XRD) was used to confirm the crystal structure of fabricated GeH and GeCH 3 (Figure 1c), which was in a good agreement with the previously published results. 42,43 The prominent peaks at about 15.56° and 9.89° corresponding to the (002) plane of GeH and GeCH 3 indicate their interlayer spacing of 5.7 and 9.0 Å. Comparing to GeH, the 1.5 times increased interlayer distance of GeCH 3 might be ascribed to the bigger size of -CH 3 group.…”

Section: Resultsmentioning

confidence: 98%

Functionalized germanane/SWCNT hybrid films as flexible anodes for lithium-ion batteries

Šturala

Veselý

et al. 2021

Nanoscale Adv.

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Exfoliation of Calcium Germanide by Alkyl Halides

Cited by 26 publications

References 43 publications

Edge-Hydrogenated Germanene by Electrochemical Decalcification-Exfoliation of CaGe2: Germanene-Enabled Vapor Sensor

Edge-Hydrogenated Germanene by Electrochemical Decalcification-Exfoliation of CaGe2: Germanene-Enabled Vapor Sensor

Ab initio prediction of semiconductivity in a novel two-dimensional Sb2X3 (X= S, Se, Te) monolayers with orthorhombic structure

Functionalized germanane/SWCNT hybrid films as flexible anodes for lithium-ion batteries

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