Wettability of vertically-oriented graphenes with different intersheet distances

Shuai, Xiaorui; Bo, Zheng; Kong, Jing; Yan, Jun; Cen, Kefa

doi:10.1039/c6ra27428e

Cited by 27 publications

(15 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It can be presumed that the samples with lower carbon content and higher crystalline order have fewer defects in their carbon networks after aging, thus, leading to higher hydrophobicity. The results are in agreement with other reports on vertically oriented graphene nanosheets, where the authors explained the decreasing of water contact angle by increasing the density of the defects adjusted by Ar plasma treatment duration or by decreasing the inter‐sheet distance (and consequently the nanosheet dimension) due to using of various synthesis methods (direct current, inductively coupled and microwave plasma sources) …”

Section: Resultssupporting

confidence: 92%

Aging phenomena and wettability control of plasma deposited carbon nanowall layers

Vizireanu

Ionita

et al. 2017

Plasma Process Polym

View full text Add to dashboard Cite

This paper reports on the aging of carbon nanowalls (CNW) and modification of their wettability by the storage time, growth conditions, and post‐fabrication plasma treatments. The as‐deposited CNW initially exhibit marked hydrophilic behavior (fresh CNW), but within a few days they become highly hydrophobic (aged CNW). Their final hydrophobicity is closely related to their topography which is controlled by the deposition parameters. In addition, subsequent fluorinated plasma treatments result in super‐hydrophobic CNW layers, irrespective of the hydrophilic or hydrophobic character of the pre‐treated samples. To explain this, we show that the CNW edges contain many defects initially, but such defects become passivated in time. As a result, the surfaces become highly hydrophobic after aging or fluorination, having inert stable terminations.

show abstract

Section: Resultssupporting

confidence: 92%

Aging phenomena and wettability control of plasma deposited carbon nanowall layers

Vizireanu

Ionita

et al. 2017

Plasma Process Polym

View full text Add to dashboard Cite

show abstract

“…Meanwhile, the surface wettability also plays a crucial role in determining the electrolyte transport and thus frequency response of supercapacitors ,. The wetting property of PIP 13 TFSI, PYR 14 TFSI and RTIL 2 : 3 on the CWF surface was explored.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical, Vertically‐Oriented Carbon Nanowall Foam Supercapacitor using Room Temperature Ionic Liquid Mixture for AC Line Filtering with Ultrahigh Energy Density

Yang

et al. 2019

ChemElectroChem

Self Cite

View full text Add to dashboard Cite

Supercapacitors have been considered as a promising alternative of aluminum electrolytic capacitors (AECs) for AC line filtering applications. However, realizing supercapacitors with fast frequency response and superior energy density still remains an open issue. Herein, we demonstrate a hierarchical, vertically‐oriented carbon nanowall foam (CWF) supercapacitor using mixed room temperature ionic liquids (RTILs) for high‐performance AC line filtering. Hierarchical CWF exhibits macrospores as electrolyte reservoirs to shorten ion transport distance, vertically‐oriented, open channels to enable fast ion diffusion and consecutive scaffolds to promote electron transfer. CWF supercapacitor using RTIL mixture realizes a recorded‐high areal energy density of 1.23 μWh cm−2 at 120 Hz (almost ∼2.0 times/∼10.0 times larger than those of organic/aqueous electrolytes, respectively) and fast frequency response (RC time constant=∼1.3 ms). More importantly, CWF supercapacitor achieves a capacitance advantage over commercial AECs up to 1,000 V, substantially larger than those reported in state‐of‐the‐art literatures (maximum of ∼250 V).

show abstract

“…Other useful characterization methods include ultraviolet photoelectron spectroscopy (UPS) for measuring the work function of VG-GNs [176,177], which provides useful information about the doping level of the graphene nanostructures; wettability studies, where the contact angle of a water droplet on the VG-GN sample is determined [72,74]; surface area measurements via nitrogen adsorption Brunauer-Emmett-Teller (BET) method [178]; and electrical transport measurements that determine the resistivity, carrier concentration and electron mobility [61,179,180]. In addition, certain application-specific characterizations, such as the cyclic voltammetry measurements, are carried out to evaluate the performance for energy storage applications.…”

Section: Characterizationmentioning

confidence: 99%

Single-step growth of graphene and graphene-based nanostructures by plasma-enhanced chemical vapor deposition

et al. 2019

View full text Add to dashboard Cite

The realization of many promising technological applications of graphene and graphenebased nanostructures depends on the availability of reliable, scalable, high-yield and low-cost synthesis methods. Plasma enhanced chemical vapor deposition (PECVD) has been a versatile technique for synthesizing many carbon-based materials, because PECVD provides a rich chemical environment, including a mixture of radicals, molecules and ions from hydrocarbon precursors, which enables graphene growth on a variety of material surfaces at lower temperatures and faster growth than typical thermal chemical vapor deposition (T-CVD). Here we review recent advances in the PECVD techniques for synthesis of various graphene and graphene-based nanostructures, including horizontal growth of monolayer and multilayer graphene sheets, vertical growth of graphene nanostructures (VG-GNs) such as graphene nanostripes (GNSPs) with large aspect ratios, direct and selective deposition of monolayer and multi-layer graphene on nanostructured substrates, and growth of multi-wall carbon nanotubes (MWCNTs). By properly controlling the gas environment of the plasma, it is found that no active heating is necessary for the PECVD growth processes, and that highyield growth can take place in a single step on a variety of surfaces, including metallic, semiconducting and insulating materials. Phenomenological understanding of the growth mechanisms are described. Finally, challenges and promising outlook for further development in the PECVD techniques for graphene-based applications are discussed.

show abstract

Wettability of vertically-oriented graphenes with different intersheet distances

Abstract: The dependence of vertically-oriented graphenes' wettability on their surface morphologies is investigated with experiments and numerical simulations.

Cited by 27 publications

References 59 publications

Aging phenomena and wettability control of plasma deposited carbon nanowall layers

Aging phenomena and wettability control of plasma deposited carbon nanowall layers

Hierarchical, Vertically‐Oriented Carbon Nanowall Foam Supercapacitor using Room Temperature Ionic Liquid Mixture for AC Line Filtering with Ultrahigh Energy Density

Single-step growth of graphene and graphene-based nanostructures by plasma-enhanced chemical vapor deposition

Contact Info

Product

Resources

About