Triboelectrification of Two-Dimensional Chemical Vapor Deposited WS2 at Nanoscale

Wang, He; Huang, Chung‐Che; Polcar, Tomáš

doi:10.1038/s41598-019-49107-y

Cited by 6 publications

(5 citation statements)

References 40 publications

(36 reference statements)

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“…[1056] Wang et al confirmed the WS 2 's triboelectric property using Kelvin force microscopy (KFM). [1057] WS 2 -based TENG was recently fabricated by Kim et al with surface modification of thiolated ligands to enhance the TENG performance (Figure 9c). [1058] Thiolated ligands acted as a p-type dopant for WS 2 , increasing the potential difference between the two triboelectric electrodes, resulting in a 10-fold increase in TENG performance compared to TENG using pure WS 2 .…”

Section: Performance Of 2d Materials-based Triboelectric Nanogeneratormentioning

confidence: 99%

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2D Materials for Wearable Energy Harvesting

Lee

2022

Adv Materials Technologies

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theoretical investigation into the effect of surface tension component ratios between the polar and dispersion components of applied solvents and 2D materials (Figure 3b). [523] The results indicated that a solvent suited for certain 2D materials LPE should have surface tension component ratios similar to the 2D materials. [523] However, direct exfoliation using sonication and Figure 3. Top-down approaches in 2D materials preparation. a) Schematically illustration of ultrasonic-assisted exfoliation. Reproduced with permission. [524] Copyright 2013, American Association for the Advancement of Science. b) Top and middle rows: dispersibility of graphene and MoS 2 as a function of total surface tension and polar to dispersive ratio. Bottom row showing the thickness histogram of graphene and MoS 2 exfoliated using solvents with the optimal surface tension and polar to dispersive component ratio. Reproduced with permission. [523] Copyright 2015, American Chemical Society. c) Detailed schematic of cathodic exfoliation (top) and anodic exfoliation (bottom) of graphene from graphite. Reproduced with permission. [1184] Copyright 2015, Elsevier. d) DFT calculation results of ion-intercalation exfoliation of graphite into graphene using SO 4 2− ion (bottom left), Li ion (top right) and K ion (bottom right). Reproduced under terms of the CC-BY license. [565] Copyright 2017, The Authors, published by the Royal Society of Chemistry. e) Left: SEM image (top) and AFM image (bottom) of a typical graphene obtained by ion-intercalated exfoliation. Right: Lateral size (top) and thickness (bottom) distribution of graphene through ion-intercalation exfoliation. Reproduced with permission.

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Section: Performance Of 2d Materials-based Triboelectric Nanogeneratormentioning

confidence: 99%

“…confirmed the WS 2 's triboelectric property using Kelvin force microscopy (KFM). [ 1057 ] WS 2 ‐based TENG was recently fabricated by Kim et al. with surface modification of thiolated ligands to enhance the TENG performance (Figure 9c).…”

Section: D Materials Based Wearable Energy Harvesting Technologiesmentioning

confidence: 99%

2D Materials for Wearable Energy Harvesting

Lee

2022

Adv Materials Technologies

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“…These TTE charges can therefore modulate the electronic properties of CVD SLG, leading to n-doped or p-doped SLG, depending on the type of TTE charge. In addition, the TTE effects have also been demonstrated on silica-supported MoS 2 , and WS 2 . However, none of the aforementioned studies on the SLG surfaces have discussed the WF of SLG after being rubbed by an electrically biased cAFM probe.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the TTE effects have also been demonstrated on silicasupported MoS 2 40,41 and WS 2 . 42 However, none of the aforementioned studies on the SLG surfaces have discussed the WF of SLG after being rubbed by an electrically biased cAFM probe. To fully exploit SLG in device application, the manner in which various experimental conditions, such as the relative humidity (RH) and polarity and magnitude of the applied electric bias, may influence the WF of SLG must be examined in detail.…”

Section: Introductionmentioning

confidence: 99%

Variations in the Effective Work Function of Graphene in a Sliding Electrical Contact Interface under Ambient Conditions

Huang

Chu

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Control of work function (WF) in graphene is crucial for graphene application in electrode material replacement and electrode surface protection in optoelectronic devices. Although efforts have been made to manipulate the effective WF of graphene to optimize its application, most studies have focused on graphene employed in static electrical contact interfaces. In this work, we investigated WF variations of supported single-layer graphene (SLG) in sliding electrical contact under ambient conditions, which was achieved by sliding an electrically biased conductive atomic force microscopy (cAFM) probe on the SLG surface. The effective WF, structural properties, and chemical compositions of rubbed SLG were subsequently measured by Kelvin probe force microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. We found that the effective WF of the rubbed SLG was governed by both the tunneling triboelectric effect (TTE) and tribochemical-induced surface functionalization. The TTE charges generated by the sliding cAFM probe tunneled through the structural defects of the SLG and were trapped underneath the SLG. The SLG will be either p-doped or n-doped depending on the type of TTE charges and the polarity of electric bias applied to the cAFM probe during the rubbing process. However, the applied electric bias also led to the electrolysis of a water meniscus formed at the cAFM probe−SLG contact, resulting in surface oxidation and the increase of SLG WF. Further absorption of ambient water molecules on the oxygenated functional groups gradually reduced the SLG WF. The influence of TTE and surface functionalization on the SLG WF depends on the magnitude and polarity of applied electric biases, relative humidity, and physical properties of the supporting substrates. Our results demonstrate that the effective WF of SLG in a sliding electrical contact interface will vary with time and might need to be considered for related applications.

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“…One of the most important scientific discoveries of the early 21 st century is the successful production of graphene, a two-dimensional carbon crystal with a hexagonal lattice (Geim, Novoselov 2010). This fact, as well as the unique properties of graphene, gave rise to works on the synthesis, analysis and modelling of new two-dimensional materials with desired properties, see, for example, recent publications in Nature Communications (Tang et al 2019) and Scientific Reports (Bravo et al 2019;Wang et al 2019). Graphene has high strength and plasticity (Frank et al 2007;Lee et al 2008), special electronic properties due to the presence of a Dirac cone in its band structure (Avouris 2010;Castro Neto et al 2009), and a record high thermal conductivity (Balandin et al 2008).…”

Section: Introductionmentioning

confidence: 99%