Efficient helium separation of graphitic carbon nitride membrane

Li, Feng; Qu, Yuanyuan; Zhao, Mingwen

doi:10.1016/j.carbon.2015.08.013

Cited by 127 publications

(99 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…al have showed that photoactivity of C 6 N 8 carbon nitride allotrope can be enhanced via nonmetal atom doping and at the end of the functionalization process, the property of visible-light absorbtion of C 6 N 8 has been increased [7]. These materials have been also investigated for helium detection and it is obtained that C 6 N 8 membrane has high capability to separate He from other gas molecules such as H 2 , N 2 , CO and CH 4 [8]. Researchers have proposed several new types of carbon nitride membranes by theoretical calculations [9][10][11], and some of these membranes have already been synthesized [12].…”

Section: Introductionmentioning

confidence: 99%

Phononic Stability Analysis of Two-Dimensional Carbon Nitride Monolayers

Sarıkurt

Ersan

2018

Marmara Fen Bilimleri Dergisi

View full text Add to dashboard Cite

In this study we examined the dynamical stability and electronic properties of carbon nitrides monolayers as C 6 N 6 and C 6 N 8. We found that buckled form of C 6 N 8 monolayer is dynamically stable instead of planar C 6 N 8 , which has been studied many times in literature. While planar C 6 N 8 has negative optical phonon modes, properly created buckling in the structure can make these imaginarities disappear and make the system dynamically stable. In the literature, the planar form of C 6 N 6 monolayer is predicted to be stable. In this work, we find out that buckling in the C 6 N 6 destabilizes the out-of-plane transverse acoustic mode (ZA) and the soft mode of the optical branch. Both buckled C 6 N 8 and planar C 6 N 6 have direct band gap of 1.82 eV and 1.58 eV, respectively, which fall in the visible region. Our outcomes may be useful in fabricating optical devices that operate in the visible range of the spectrum.

show abstract

Section: Introductionmentioning

confidence: 99%

Phononic Stability Analysis of Two-Dimensional Carbon Nitride Monolayers

Sarıkurt

Ersan

2018

Marmara Fen Bilimleri Dergisi

View full text Add to dashboard Cite

show abstract

“…Among these, graphitic carbon nitride (g-C 3 N 4 ) has been studied for a long time [22] and it can be used in many energy applications, such as hydrogen generation [23], efficient energy storage [24], and photocatalytic degradation of pollutants [25]. Nanoporous carbon nitride materials, such as the C 2 N monolayer [26], can be applied in gas separation [27][28][29] or water desalination [30]. The carbon nitride materials not only have a huge potential in applications but also exhibit many interesting physical effects, including QSH [31], quantum anomalous Hall (QAH) [32,33], and spin-polarization [34,35] effects.…”

Section: Introductionmentioning

confidence: 99%

Carbon-rich carbon nitride monolayers with Dirac cones: Dumbbell C4N

Kong

Leenaerts

et al. 2017

Carbon

View full text Add to dashboard Cite

Two-dimensional (2D) carbon nitride materials play an important role in energy-harvesting, energy-storage and environmental applications. Recently, a new carbon nitride, 2D polyaniline (C 3 N)was proposed [PNAS 113 (2016) 7414-7419]. Based on the structure model of this C 3 N monolayer, we propose two new carbon nitride monolayers, named dumbbell (DB) C 4 N-I and C 4 N-II. Using first-principles calculations, we systematically study the structure, stability, and band structure of these two materials. In contrast to other carbon nitride monolayers, the orbital hybridization of the C/N atoms in the DB C 4 N monolayers is sp 3 . Remarkably, the band structures of the two DB C 4 N monolayers have a Dirac cone at the K point and their Fermi velocities (2.6/2.4×10 5 m/s) are comparable to that of graphene. This makes them promising materials for applications in high-speed electronic devices. Using a tight-binding model, we explain the origin of the Dirac cone.

show abstract

“…This phenomenon has been demonstrated to effectively enable the helium isotopes separation by several two-dimensional (2D) membranes at low temperatures, where the lighter isotope (e.g. 3 He) is more inclined to transmit through the membranes 18–20 . In these systems, the interaction between the membrane and the guest isotopes can be tuned by applying tensile strain which modifies the pore size of the membrane, and highly efficient isotopes separation with optimized selectivity and permeance can be obtained 21 .…”

Section: Introductionmentioning

confidence: 99%

Efficient hydrogen isotopologues separation through a tunable potential barrier: The case of a C2N membrane

Zhao

2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

Isotopes separation through quantum sieving effect of membranes is quite promising for industrial applications. For the light hydrogen isotopologues (eg. H2, D2), the confinement of potential wells in porous membranes to isotopologues was commonly regarded to be crucial for highly efficient separation ability. Here, we demonstrate from first-principles that a potential barrier is also favorable for efficient hydrogen isotopologues separation. Taking an already-synthesized two-dimensional carbon nitride (C2N-h2D) as an example, we predict that the competition between quantum tunneling and zero-point-energy (ZPE) effects regulated by the tensile strain leads to high selectivity and permeance. Both kinetic quantum sieving and equilibrium quantum sieving effects are considered. The quantum effects revealed in this work offer a prospective strategy for highly efficient hydrogen isotopologues separation.

show abstract

Efficient helium separation of graphitic carbon nitride membrane

Cited by 127 publications

References 74 publications

Phononic Stability Analysis of Two-Dimensional Carbon Nitride Monolayers

Phononic Stability Analysis of Two-Dimensional Carbon Nitride Monolayers

Carbon-rich carbon nitride monolayers with Dirac cones: Dumbbell C4N

Efficient hydrogen isotopologues separation through a tunable potential barrier: The case of a C2N membrane

Contact Info

Product

Resources

About