Surface energy and wettability of van der Waals structures

Annamalai, Meenakshi; Gopinadhan, K.; Han, Sang A; Saha, Surajit; Park, Hye Jeong; Cho, Eun Bi; Kumar, Brijesh; Patra, Abhijeet; Kim, Sang Woo; Venkatesan, T.

doi:10.1039/c5nr06705g

Cited by 188 publications

(143 citation statements)

References 50 publications

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“…There are simple solutions for wettability but because (NH 4 ) 2 WS 4 is weakly coordinated with most of the solvents 24 , the key challenge in making a solution-based uniform ultra-thin WS 2 film is formulating a solution recipe that results in a high solubility of the precursor with the optimum viscosity. Based on this, we chose the most promising solvents reported previously for spin coating, namely (DMF) 27 , ethylene glycol 26 , (NMP) 12 to investigate which one has the maximum solvation and coverage over the substrate. Preparation of the substrates and precursor solutions for spin coating is described in Materials and Methods.…”

Section: Resultsmentioning

confidence: 99%

Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Abbas

Zeimpekis

Wang

et al. 2020

Sci Rep

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Unlike MoS 2 ultra-thin films, where solution-based single source precursor synthesis for electronic applications has been widely studied, growing uniform and large area few-layer WS 2 films using this approach has been more challenging. Here, we report a method for growth of few-layer WS 2 that results in continuous and uniform films over centimetre scale. The method is based on the thermolysis of spin coated ammonium tetrathiotungstate ((NH 4 ) 2 WS 4 ) films by two-step high temperature annealing without additional sulphurization. this facile and scalable growth method solves previously encountered film uniformity issues. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) were used to confirm the few-layer nature of WS 2 films. Raman and X-Ray photoelectron spectroscopy (XPS) revealed that the synthesized few-layer WS 2 films are highly crystalline and stoichiometric. Finally, WS 2 films as-deposited on SiO 2 /Si substrates were used to fabricate a backgated Field Effect Transistor (FET) device for the first time using this precursor to demonstrate the electronic functionality of the material and further validate the method.FET from an as-deposited WS 2 film grown by our solution based process with an electron mobility reaching 6.2 × 10 −5 cm 2 /V.s which shows comparable performance to MoS 2 devices fabricated by similar synthesis approaches.

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Section: Resultsmentioning

confidence: 99%

Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Abbas

Zeimpekis

Wang

et al. 2020

Sci Rep

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“…The contact angles were measured at be measured at 22 °C and 45% RH conditions and a video was recorded (72 frames/second) for every dispensed solvent droplet. Any dynamic changes to the droplet on the surface could be precisely observed through this method33.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles

Deepa

Reed

Annamalai

et al. 2016

Sci Rep

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Multifunctional coatings offer many advantages towards protecting various surfaces. Here we apply aggregation induced segregation of perylene diimide (PDI) to control the surface morphology and properties of silica nanoparticles. Differentially functionalized PDI was incorporated on the surface of silica nanoparticles through Si-O-Si bonds. The absorption and emission spectra of the resultant functionalised nanoparticles showed monomeric or excimeric peaks based on the amounts of perylene molecules present on the surface of silica nanoparticles. Contact angle measurements on thin films prepared from nanoparticles showed that unfunctionalised nanoparticles were superhydrophilic with a contact angle (CA) of 0°, whereas perylene functionalised silica particles were hydrophobic (CA > 130°) and nanoparticles functionalised with PDI and trimethoxy(octadecyl)silane (TMODS) in an equimolar ratio were superhydrophobic with static CA > 150° and sliding angle (SA) < 10°. In addition, the near infrared (NIR) reflectance properties of PDI incorporated silica nanoparticles can be used to protect various heat sensitive substrates. The concept developed in this paper offers a unique combination of super hydrophobicity, interesting optical properties and NIR reflectance in nanosilica, which could be used for interesting applications such as surface coatings with self-cleaning and NIR reflection properties.

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“…The coating can also be applied onto various other substrates such as metals, wood, ceramics, and polyethylene terephthalate (PET, Figures b‑e and Supporting Information Movies S3‐S6). The surface free energy (SFE) of the coating and these substrates was determined via advancing contact angle measurements using water and diiodomethane as the probe liquids through the Owens, Wendt, Rabel, and Kaelbe (OWRK) method (Table ) . As predicted, the coating containing the SSH components exhibited a lower SFE of 27.3 mN/m than the uncoated substrates, which could be attributed to the SSH components that bearing PDMS chains with a room‐temperature surface tension of 20 mN/m …”

Section: Resultsmentioning

confidence: 91%

Preventing crude oil adhesion using fully waterborne coatings

Zhang

Liu

et al. 2019

AIChE Journal

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The petroleum industry has focused on the modification of crude oil composites to decrease their adhesion onto materials and thus facilitate oil extraction, transportation, storage, and processing. However, these methods such as heating, dilution, emulsification, or additives are often accompanied by significant costs and suffer from various limitations. Herein, we present a conceptually different coating strategy that allows many substrates to repel crude oil. The novel coating was achieved via a fully waterborne polymer crosslinkable system consisting of polymer particles, a silicone surfactant, and a melamine formaldehyde resin. Considering the unique anti‐crude‐oil‐adhesion properties, the outstanding physical and chemical stability, as well as the green and industrially‐viable process involved, we anticipate that this coating can provide a promising starting point toward the functionalization of the surfaces of equipment or pipelines that are routinely exposed to crude oils.

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Surface energy and wettability of van der Waals structures

Cited by 188 publications

References 50 publications

Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Synthesis and Characterization of Superhydrophobic, Self-cleaning NIR-reflective Silica Nanoparticles

Preventing crude oil adhesion using fully waterborne coatings

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