Flexoelectricity and electronic properties of monolayer GaSe under shear strain gradient

Zhang, Juxiao; Li, Guannan; Zhang, Bingwen; Lin, Xichen

doi:10.1016/j.physleta.2022.128090

Cited by 7 publications

(4 citation statements)

References 42 publications

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“…These inhomogeneous strains are chosen because they are common in a distorted sheet, such as the FNG cell during operation. [38] While there are density functional perturbation methods for calculating flexoelectric coefficients, [39] we elected for a simpler strategy involving calculations on a supercell with a manual, periodic strain imposed (see details in section S2, Supporting Information, Theoretical calculations). [11,40] We refer to the periodic strain modes corresponding to the calculation of μ 3kk3 and μ 33kk as the shear and bending modes, respectively.…”

Section: Resultsmentioning

confidence: 99%

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Chowde Gowda,

Cavin,

Kumbhakar

et al. 2023

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Atomically thin, few‐layered membranes of oxides show unique physical and chemical properties compared to their bulk forms. Manganese oxide (Mn3O4) membranes are exfoliated from the naturally occurring mineral Hausmannite and used to make flexible, high‐performance nanogenerators (NGs). An enhanced power density in the membrane NG is observed with the best‐performing device showing a power density of 7.99 mW m−2 compared to 1.04 µW m−2 in bulk Mn3O4. A sensitivity of 108 mV kPa−1 for applied forces <10 N in the membrane NG is observed. The improved performance of these NGs is attributed to enhanced flexoelectric response in a few layers of Mn3O4. Using first‐principles calculations, the flexoelectric coefficients of monolayer and bilayer Mn3O4 are found to be 50–100 times larger than other 2D transition metal dichalcogenides (TMDCs). Using a model based on classical beam theory, an increasing activation of the bending mode with decreasing thickness of the oxide membranes is observed, which in turn leads to a large flexoelectric response. As a proof‐of‐concept, flexible NGs using exfoliated Mn3O4 membranes are made and used in self‐powered paper‐based devices. This research paves the way for the exploration of few‐layered membranes of other centrosymmetric oxides for application as energy harvesters.

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Section: Resultsmentioning

confidence: 99%

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Chowde Gowda,

Cavin,

Kumbhakar

et al. 2023

Small

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show abstract

“…These inhomogeneous strains are chosen because they are common in a distorted sheet, such as the FNG cell during operation. [38] While there are density functional perturbation methods for calculating flexoelectric coefficients, [39] we elected for a simpler strategy involving calculations on a supercell with a manual, periodic strain imposed (see details in SI section 2, Theoretical calculations). [11,40] We refer to the periodic strain modes corresponding to the calculation of 𝜇 3𝑘𝑘3 and 𝜇 33𝑘𝑘 as the shear and bending modes, respectively.…”

Section: Figure 2bmentioning

confidence: 99%

Flexible Nanogenerators based on Enhanced Flexoelectricity in Mn3O4 Membranes

Gowda,

Cavin,

Kumbhakar

et al. 2023

Preprint

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Atomically thin, few-layered membranes of oxides show unique physical and chemical properties compared to their bulk forms. We have exfoliated manganese oxide (Mn3O4) membranes from the naturally occurring mineral Hausmannite and used them to make flexible, high-performance nanogenerators. We observe an enhanced power density in the membrane nanogenerators (NG) with the best-performing device showing a power density of 7.99 mW m-2 compared to 1.04 µW m-2 obtained from NG made up of bulk Mn3O4. We also observe a sensitivity of 108 mV kPa-1 for applied forces < 10 N in the membrane NGs. We attribute the improved performance of these NGs to enhanced flexoelectric response in few-layers of Mn3O4. Using first-principles calculations, we calculate the flexoelectric coefficients of monolayer and bilayer Mn3O4, and find them to be 50 – 100 times larger than other two-dimensional transition metal dichalcogenides (TMDCs). Using a model based on classical beam theory, we find increasing activation of the bending mode with decreasing thickness of the oxide membranes, which in turn leads to a large flexoelectric response. As a proof-of-concept, we made flexible nanogenerators using exfoliated Mn3O4 membranes and used them in self-powered paper-based devices. This research paves the way for the exploration of few-layered membranes of other centrosymmetric oxides for application as energy harvesters.

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“…44 Beside strain engineering, a strain gradient effect on the electronic properties of nanomaterials was also explored in very recent years. 45,46 As a matter of fact, a strain-gradient-induced electric field was recognized as novel electromechanical coupling named flexoelectricity. 47 The flexoelectricity of 2D materials, 48 e.g.…”

Section: Introductionmentioning

confidence: 99%

Tunable Li-ion diffusion properties in MoSSe bilayer anodes by strain gradient

Zhong,

Li,

et al. 2024

Phys. Chem. Chem. Phys.

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Flexoelectricity and electronic properties of monolayer GaSe under shear strain gradient

Cited by 7 publications

References 42 publications

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Flexible Nanogenerators based on Enhanced Flexoelectricity in Mn3O4 Membranes

Tunable Li-ion diffusion properties in MoSSe bilayer anodes by strain gradient

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Flexoelectricity and electronic properties of monolayer GaSe under shear strain gradient

Cited by 7 publications

References 42 publications

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn3O4 Membranes

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn3O4 Membranes

Flexible Nanogenerators based on Enhanced Flexoelectricity in Mn3O4 Membranes

Tunable Li-ion diffusion properties in MoSSe bilayer anodes by strain gradient

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Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes