Analysis of plasma-grown carbon oxide and reduced-carbon-oxide nanowalls

Choi, Hyeokjoo; Kwon, Seok Hun; Kang, Hyunil; Kim, Jung Hyun

doi:10.1039/c9ra10433j

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…On the contrary, the SMCNW in Figure 4 b has a low contact angle with DI water due to activation of the functional group on the nanowall surface, and is hydrophilic and polar. The extreme change in the contact angle through surface modification of the nanowall can also be explained by the Laplace pressure, which results from the difference in surface energy between the nanowall and the buffer layer [ 27 , 28 ]. The PR that was used in this study was a non-polar molecule.…”

Section: Resultsmentioning

confidence: 99%

Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

et al. 2020

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The application of a carbon nanowall (CNW) via transfer is very demanding due to the unusual structure of vertically grown wall-shaped that easily collapses. In addition, direct growth on a device cannot obtain a precision-patterned shape because of the temperature limit of the photoresist (PR). Therefore, in this paper, we demonstrate a new CNW surface micromachining technology capable of direct growth. In order to reduce unexpected damage caused by chemical etching, a physical force was used to etch with the adhesive properties of CNWs that have low adhesion to silicon wafer. To prevent compositing with PR, the CNW was surface modified using oxygen plasma. Since there is a risk of surface-modified CNW (SMCNW) collapse in an ultrasonic treatment, which is a physical force, the CNW was coated with PR. After etching the SMCNW grown on PR uncoated area, PR was lifted off using an acetone solution. The effect on the SMCNW by the lift-off process was investigated. The surface, chemical, and structural properties of PR-removed SMCNW and pristine-SMCNW were compared and showed a minimal difference. Therefore, the CNW surface micromachining technique was considered successful.

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Section: Resultsmentioning

confidence: 99%

Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

et al. 2020

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“…For all these applications the wettability has to be controlled, as it influences their electrochemical characteristics. Recent works report on the influence of the different plasma treatments on the wettability of the CNWs [31][32][33][34]. The synthesized structures have a CA close to 120°, which can be changed by plasma modification from 20°to 160°.…”

Section: Introductionmentioning

confidence: 99%

Plasma modification of carbon nanowalls induces transition from superhydrophobic to superhydrophilic

et al. 2021

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Graphene-based materials play an essential role in a wide range of modern technologies due to their surface properties such as adsorption capacity and controllable wettability, which depend on the production methods. For practical applications, it is crucial to control the surface properties to achieve the desired wetting characteristics, which can be described with the contact angle (CA). Here, we experimentally investigate the wettability properties of the carbon nanowalls and show how to manage a wetting transition from superhydrophobic to superhydrophilic states. A CA of 170° was reached with direct plasma synthesis, while an angle smaller than 20° was achieved during the atmosphere plasma modification. Combining the formation of the surface groups due to the plasma treatment results and the macroscale wetting behavior in terms of the Cassie–Baxter model, we qualitatively explain how the observed wetting enhancement is induced by both controlled chemical and geometrical surface-heterogeneity.

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Aging of plasma-activated carbon surfaces: Challenges and opportunities

Ortiz-Ortega

Hosseini

Martínez-Chapa

et al. 2021

Applied Surface Science

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Analysis of plasma-grown carbon oxide and reduced-carbon-oxide nanowalls

Abstract: In this study, several characteristics of carbon oxide nanowalls (CONWs) and reduced-carbon-oxide nanowalls (rCONWs) activated using plasma and thermochemistry were investigated.

Cited by 5 publications

References 18 publications

Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

Plasma modification of carbon nanowalls induces transition from superhydrophobic to superhydrophilic

Aging of plasma-activated carbon surfaces: Challenges and opportunities

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