Bubbles as a platform for investigating work function tunability of 2D materials under biaxial strains

Long, Yuyang; Jiang, Zonghuiyi; Gao, Zhida; Li, Baowen; Li, Xuemei; Liu, Xiaofei; Yin, Jun; Guo, Wanlin

doi:10.1016/j.eml.2023.101978

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…Best fit gives a V-shape curve with the minimum CPD at strain of 0.2%. The trend of the CPD-strain curve in strain > 0.2% agrees well with that of ReS 2 bubbles reported by Long et al [43] The measured CPD of ReS 2 is inversely proportional to its Fermi level, which has been defined as…”

Section: -2supporting

confidence: 90%

Unveiling localized electronic properties of ReS₂ thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Luo

Zhang³

et al. 2023

Chinese Phys. B

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The electronic properties of two-dimensional (2D) material is strongly modulated by localized strain. The typical spatial resolution of conventional Kelvin probe force microscopy(KPFM) is usually limited in few hundreds nanometers, which is hard to characterize the localized electronic properties of 2D materials at the nanoscale. Herein, tip-enhanced Raman spectroscopy(TERS) was proposed to combine with KPFM to break this restriction. TERS scan was conducted on ReS2 bubbles deposited on rough Au thin film to obtain strain distribution by using the Raman peak shift. The localized contact potential difference (CPD) was inversely calculated with a higher spatial resolution by using strain measured by TERS and CPD-strain working curve obtained using conventional KPFM and atomic force microscopy(AFM). This method enhances the spatial resolution of CPD measurement and can be potentially used to characterize the localized electronic properties of 2D materials.

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Section: -2supporting

confidence: 90%

Unveiling localized electronic properties of ReS₂ thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Luo

Zhang³

et al. 2023

Chinese Phys. B

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“…Due to the adhesion between the adjacent stacking layers, the trapped molecules coalesce and bulge the capping layers to form micro- and nanoscale blisters. Such blisters are indeed frequently seen between 2D materials and their substrates. − Although being considered as contaminations that affect device performances and therefore cleaning methods of them are of great importance, − , blisters confined by 2D materials also attract research interests from both fundamental and applied perspectives. For example, analyzing their morphology allows us to study the mechanical and interfacial properties of the capping 2D materials. ,, Blisters enclosing liquids benefit understanding a novel wetting phenomenon known as elastic-wetting. , Moreover, the high internal pressure of 2D material blisters inspires high-pressure chemistry within them, , and their potential for strain engineering is also explored. − …”

Section: Introductionmentioning

confidence: 99%

Mechanical Mapping of Nanoblisters Confined by Two-Dimensional Materials Reveals Complex Ridge Patterns

Ma,

Yang,

Chen

et al. 2024

Langmuir

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Understanding the mechanics of blisters confined by two-dimensional (2D) materials is of great importance for either fundamental studies or for their practical applications. In this work, we investigate the mechanical properties of nanoscale 2D material blisters using contact-resonance atomic force microscopy (CR-AFM). From the measurement results at the blister centers, the blisters' internal pressures are characterized, which are shown to be inversely proportional to the blisters' sizes. Our measurements agree considerably well with values predicted by theoretical mechanic analyses of the blisters. In addition, high-resolution mechanical mapping with CR-AFM reveals fine, complex ridge patterns of the blisters' confining membranes, which can hardly be distinguished from their topographies. The pattern complexity of a blister system is shown to increase with an increase in its bendability.

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Coupling of Piezo/Flexoelectricity and Its Effect on the Band Structure of Wrinkled ZnO Monolayers

Yin,

Jia,

et al. 2024

Adv Funct Materials

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Wrinkles are used in manufacturing stretchable electronics, soft materials, smart displays, and microstructures. The emerging 2D materials enable the investigation of the intertwined piezoelectric and flexoelectric coupling effect in wrinkled structures and their energy, sensing, and other applications. However, current studies of the electromechanical coupling effect often consider it one effect or even overlook one of the two effects. This oversimplification leads to inaccuracies in the analysis. Here, a theoretical model is proposed to separate the piezoelectric and flexoelectric coefficients by fitting polarization formulas with discrete polarization values calculated using density functional theory. Wrinkled ZnO monolayers are built to mimic the realistic situation, where six nonzero coefficients are successfully isolated, revealing that the coupling of piezo/flexoelectricity and the contribution of piezoelectric and flexoelectric polarizations to the total polarization vary in different directions. Combined with the dipole moment analysis, the relationship between the polarization, piezoelectric coefficient, flexoelectric coefficient, and wrinkle amplitude is established. This study demonstrates that increasing the wrinkle amplitude significantly decreases the energy gap of 560 meV. The separation and quantification of piezoelectric and flexoelectric effects advance the understanding of wrinkles' mechanical and electromechanical properties and lay the foundation for their future applications.

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Bubbles as a platform for investigating work function tunability of 2D materials under biaxial strains

Cited by 4 publications

References 36 publications

Unveiling localized electronic properties of ReS₂ thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Unveiling localized electronic properties of ReS₂ thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Mechanical Mapping of Nanoblisters Confined by Two-Dimensional Materials Reveals Complex Ridge Patterns

Coupling of Piezo/Flexoelectricity and Its Effect on the Band Structure of Wrinkled ZnO Monolayers

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Bubbles as a platform for investigating work function tunability of 2D materials under biaxial strains

Cited by 4 publications

References 36 publications

Unveiling localized electronic properties of ReS2 thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Unveiling localized electronic properties of ReS2 thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Mechanical Mapping of Nanoblisters Confined by Two-Dimensional Materials Reveals Complex Ridge Patterns

Coupling of Piezo/Flexoelectricity and Its Effect on the Band Structure of Wrinkled ZnO Monolayers

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Unveiling localized electronic properties of ReS₂ thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Unveiling localized electronic properties of ReS₂ thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy