Two-dimensional monoelemental germanene nanosheets: facile preparation and optoelectronic applications

Li, Chao; Kang, Jianlong; Xie, Jianlei; Wang, Yingwei; Zhou, Li; Hu, Haiguo; Li, Xinzhe; He, Jun; Wang, Bing; Zhang, Han

doi:10.1039/d0tc03892j

“…Reproduced with permission. [113] Copyright 2020, The Royal Society of Chemistry. i,j) SEM images of i) pristine bulk CaSi 2 and j) the as-reacted product with the insets showing their photographs.…”

Section: Germananementioning

confidence: 99%

“…The obtained GeQDs had an average lateral size of ≈4.5 nm and a thickness of ≈2.2 nm (Figure 2b-e). Very recently, Li et al [113] were able to prepare few-layered Ge nanosheets via a facile LPE method using N-methyl-2-pyrrolidone (NMP) for use in photodetectors. In order to avoid oxidation, both tip and bath sonication steps were carried out under an argon (Ar) atmosphere.…”

Section: Germananementioning

confidence: 99%

See 1 more Smart Citation

Elemental 2D Materials: Solution‐Processed Synthesis and Applications in Electrochemical Ammonia Production

Bat‐Erdene

¹

,

Bati

²

,

Qin

³

et al. 2021

Adv Funct Materials

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Graphene and related elemental 2D materials have become core materials in nanotechnology and shown great promise for industrially important electrocatalysis reactions. Although excellent progress has been made over the past few years, research into the field of elemental 2D materials beyond graphene is still at an early stage. Importantly, recent research has revealed the promising efficacy of elemental 2D materials as effective nitrogen reduction reaction (NRR) electrocatalysts due to their many excellent properties including high surface activities, acting as active sites for effective functionalization and defect engineering. This review provides a comprehensive account of recent advances in elemental 2D materials with a major focus on the solution-based synthesis routes and their applications in electrocatalytic NRR for ammonia (NH 3 ) production. After a concise overview of elemental 2D materials, the advantages and challenges of currently available methods for the synthesis of these 2D materials are discussed. Then, the review focuses on the use of these emerging 2D materials in the electrocatalytic reduction of N 2 for sustainable (NH 3 ) synthesis. Finally, the challenges still to be addressed, and important perspectives in this attractive field are emphasized.

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“…1 Free-standing germanene layer was theoretically predicted for the first time in 2009 2 reporting a narrow bandgap opening (about 0.024 eV) 1 in contrast to the zero bandgap of graphene. This promotes a quantum-spin Hall effect 3 and massless Dirac fermions, 4 that together with the tunable bandgap, 5,6 makes germanene's use realistic for optoelectronics, [7][8][9] sensing, [10][11][12] energy storage, [13][14][15] and catalysis. 6,16,17 The electronic and magnetic properties of buckled germanene are size and geometry determined and can be tuned by strain 18,19 or surface functionalization.…”

Section: Introductionmentioning

confidence: 99%

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

Kovalska

¹

,

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>

show abstract

“…1 Free-standing germanene layer was theoretically predicted for the first time in 2009 2 reporting a narrow bandgap opening (about 0.024 eV) 1 in contrast to the zero bandgap of graphene. This promotes a quantum-spin Hall effect 3 and massless Dirac fermions, 4 that together with the tunable bandgap, 5,6 makes germanene's use realistic for optoelectronics, [7][8][9] sensing, [10][11][12] energy storage, [13][14][15] and catalysis. 6,16,17 The electronic and magnetic properties of buckled germanene are size and geometry determined and can be tuned by strain 18,19 or surface functionalization.…”

Section: Introductionmentioning

confidence: 99%

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

Kovalska

¹

,

Antonatos²,

Sofer³

2021

Preprint

0

View full text Add to dashboard Cite

<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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Two-dimensional monoelemental germanene nanosheets: facile preparation and optoelectronic applications

Abstract: Due to high carrier mobility, excellent stability and tunable optical properties, 2D monoelemental germanene has attracted great attention in recent years. Herein, few-layer 2D germanium nanosheets (GeNS) are obtained via...

Cited by 28 publications

References 42 publications

Elemental 2D Materials: Solution‐Processed Synthesis and Applications in Electrochemical Ammonia Production

Elemental 2D Materials: Solution‐Processed Synthesis and Applications in Electrochemical Ammonia Production

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

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