Directional dependent piezoelectric effect in CVD grown monolayer MoS 2  for flexible piezoelectric nanogenerators

Kim, Sung Kyun; Bhatia, Ravi; Seol, Daehee; Kim, Jung Ho; Kim, Hyun; Seung, Wanchul; Kim, Yunseok; Lee, Young Hee; Kim, Sang Woo

doi:10.1016/j.nanoen.2016.02.046

Cited by 214 publications

(179 citation statements)

References 32 publications

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“…where is the PE coefficient, is the FE coefficient, is the strain, and ⁄ is the strain gradient [255]. A few studies have theoretically [262][263][264] and experimentally [265][266][267][268] explored PE in 2D materials. FE on the other hand is relatively understudied in 2D materials although its monatomic thickness affords a potentially greater platform for future studies.…”

Section: Piezo-and Flexoelectricitymentioning

confidence: 99%

A review on mechanics and mechanical properties of 2D materials—Graphene and beyond

Akinwande

Brennan

Bunch

et al. 2017

Extreme Mechanics Letters

1,048

649

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Since the first successful synthesis of graphene just over a decade ago, a variety of twodimensional (2D) materials (e.g., transition metal-dichalcogenides, hexagonal boron-nitride, etc.) have been discovered. Among the many unique and attractive properties of 2D materials, mechanical properties play important roles in manufacturing, integration and performance for their potential applications. Mechanics is indispensable in the study of mechanical properties, both experimentally and theoretically. The coupling between the mechanical and other physical properties (thermal, electronic, optical) is also of great interest in exploring novel applications, where mechanics has to be combined with condensed matter physics to establish a scalable theoretical framework. Moreover, mechanical interactions between 2D materials and various substrate materials are essential for integrated device applications of 2D materials, for which the mechanics of interfaces (adhesion and friction) has to be developed for the 2D materials. Here we review recent theoretical and experimental works related to mechanics and mechanical properties of 2D materials. While graphene is the most studied 2D material to date, we expect continual growth of interest in the mechanics of other 2D materials beyond graphene.

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Section: Piezo-and Flexoelectricitymentioning

confidence: 99%

A review on mechanics and mechanical properties of 2D materials—Graphene and beyond

Akinwande

Brennan

Bunch

et al. 2017

Extreme Mechanics Letters

1,048

649

View full text Add to dashboard Cite

show abstract

“…Scanning probe microscopy (SPM) techniques, i.e., piezoresponse force microscopy (PFM) and conductive atomic force microscope (C‐AFM) have been considered as the preferred tools to dissect the extremely weak electromechanical phenomenon of low‐dimensional materials. Piezoelectric effect of 2D materials can be achieved by collecting the mechanical strain induced voltage or current alteration on piezoelectric devices . A method combining a laterally applied electric field and nanoindentation technique was employed to observe piezoelectricity in free‐standing MoS 2 .…”

Section: Introductionmentioning

confidence: 99%

Probing Effective Out‐of‐Plane Piezoelectricity in van der Waals Layered Materials Induced by Flexoelectricity

Wang

Cui

Chen

et al. 2019

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Many van der Waals layered 2D materials, such as h‐BN, transition metal dichalcogenides (TMDs), and group‐III monochalcogenides, have been predicted to possess piezoelectric and mechanically flexible natures, which greatly motivates potential applications in piezotronic devices and nanogenerators. However, only intrinsic in‐plane piezoelectricity exists in these 2D materials and the piezoelectric effect is confined in odd‐layers of TMDs. The present work is intent on combining the free‐standing design and piezoresponse force microscopy techniques to obtain and directly quantify the effective out‐of‐plane electromechanical coupling induced by strain gradient on atomically thin MoS2 and InSe flakes. Conspicuous piezoresponse and the measured piezoelectric coefficient with respect to the number of layers or thickness are systematically illustrated for both MoS2 and InSe flakes. Note that the promising effective piezoelectric coefficient (deff33) of about 21.9 pm V−1 is observed on few‐layered InSe. The out‐of‐plane piezoresponse arises from the net dipole moment along the normal direction of the curvature membrane induced by strain gradient. This work not only provides a feasible and flexible method to acquire and quantify the out‐of‐plane electromechanical coupling on van der Waals layered materials, but also paves the way to understand and tune the flexoelectric effect of 2D systems.

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“…[31] Atomic force microscope (AFM) measurements show an average thicknesses from 2.2 to 2.6 nm (Figures 2e-f), which is consistent with reported values of ce-MoS 2 . [38,39] Electrosorption desalination performances of the as-prepared 1T-MoS 2 nanosheets were tested by cyclic voltammetry (CV) measurements with a conventional three-electrode cell. F/g, considerably larger than that bulk MoS 2 (17.6 F/g).…”

Section: Resultsmentioning

confidence: 99%

Chemically exfoliated MoS2 for capacitive deionization of saline water

et al. 2017

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Directional dependent piezoelectric effect in CVD grown monolayer MoS 2 for flexible piezoelectric nanogenerators

Cited by 214 publications

References 32 publications

A review on mechanics and mechanical properties of 2D materials—Graphene and beyond

A review on mechanics and mechanical properties of 2D materials—Graphene and beyond

Probing Effective Out‐of‐Plane Piezoelectricity in van der Waals Layered Materials Induced by Flexoelectricity

Chemically exfoliated MoS2 for capacitive deionization of saline water

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