Carbon Nanotube Networks as Nanoscaffolds for Fabricating Ultrathin Carbon Molecular Sieve Membranes

Jue Hou, Huacheng Zhang, Yaoxin Hu, Xingya Li, Xiaofang Chen, Seungju Kim, Yuqi Wang, George P. Simon, Huanting Wang

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Carbon molecular sieve (CMS) membranes have shown great potential for gas separation owing to their low cost, good chemical stability, and high selectivity. However, most of the conventional CMS membranes exhibit low gas permeance due to their thick active layer, which limits their practical applications. Herein, we report a new strategy for fabricating CMS membranes with a 100 nm-thick ultrathin active layer using poly(furfuryl alcohol) (PFA) as a carbon precursor and carbon nanotubes (CNTs) as nanoscaffolds. CNT networks are deposited on a porous substrate as nanoscaffolds, which guide PFA solution to effectively spread over the substrate and form a continuous layer, minimizing the penetration of PFA into the pores of the substrate. After pyrolysis process, the CMS membranes with 100-1000 nm-thick active layer can be obtained by adjusting the CNT loading. The 322 nm-thick CMS membrane exhibits the best trade-off between the gas permeance and selectivity, a H2 permeance of 4.55 × 10-8 mol m-2 s-1 Pa-1, an O2 permeance of 2.1 × 10-9 mol m-2 s-1 Pa-1, and an O2/N2 ideal selectivity of 10.5, which indicates the high quality of the membrane produced by this method. This work provides a simple, efficient strategy for fabricating ultrathin CMS membranes with high selectivity and improved gas flux.

Original languageEnglish
Pages (from-to)20182-20188
Number of pages7
JournalACS Applied Materials and Interfaces
Volume10
Issue number23
DOIs
Publication statusPublished - 13 Jun 2018

Keywords

  • carbon molecular sieve membrane
  • carbon nanotube
  • gas separation
  • membrane preparation
  • nanoscaffold

Cite this

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title = "Carbon Nanotube Networks as Nanoscaffolds for Fabricating Ultrathin Carbon Molecular Sieve Membranes",
abstract = "Carbon molecular sieve (CMS) membranes have shown great potential for gas separation owing to their low cost, good chemical stability, and high selectivity. However, most of the conventional CMS membranes exhibit low gas permeance due to their thick active layer, which limits their practical applications. Herein, we report a new strategy for fabricating CMS membranes with a 100 nm-thick ultrathin active layer using poly(furfuryl alcohol) (PFA) as a carbon precursor and carbon nanotubes (CNTs) as nanoscaffolds. CNT networks are deposited on a porous substrate as nanoscaffolds, which guide PFA solution to effectively spread over the substrate and form a continuous layer, minimizing the penetration of PFA into the pores of the substrate. After pyrolysis process, the CMS membranes with 100-1000 nm-thick active layer can be obtained by adjusting the CNT loading. The 322 nm-thick CMS membrane exhibits the best trade-off between the gas permeance and selectivity, a H2 permeance of 4.55 × 10-8 mol m-2 s-1 Pa-1, an O2 permeance of 2.1 × 10-9 mol m-2 s-1 Pa-1, and an O2/N2 ideal selectivity of 10.5, which indicates the high quality of the membrane produced by this method. This work provides a simple, efficient strategy for fabricating ultrathin CMS membranes with high selectivity and improved gas flux.",
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author = "Jue Hou and Huacheng Zhang and Yaoxin Hu and Xingya Li and Xiaofang Chen and Seungju Kim and Yuqi Wang and Simon, {George P.} and Huanting Wang",
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Carbon Nanotube Networks as Nanoscaffolds for Fabricating Ultrathin Carbon Molecular Sieve Membranes. / Hou, Jue; Zhang, Huacheng; Hu, Yaoxin; Li, Xingya; Chen, Xiaofang; Kim, Seungju; Wang, Yuqi; Simon, George P.; Wang, Huanting.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 23, 13.06.2018, p. 20182-20188.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Carbon Nanotube Networks as Nanoscaffolds for Fabricating Ultrathin Carbon Molecular Sieve Membranes

AU - Hou, Jue

AU - Zhang, Huacheng

AU - Hu, Yaoxin

AU - Li, Xingya

AU - Chen, Xiaofang

AU - Kim, Seungju

AU - Wang, Yuqi

AU - Simon, George P.

AU - Wang, Huanting

PY - 2018/6/13

Y1 - 2018/6/13

N2 - Carbon molecular sieve (CMS) membranes have shown great potential for gas separation owing to their low cost, good chemical stability, and high selectivity. However, most of the conventional CMS membranes exhibit low gas permeance due to their thick active layer, which limits their practical applications. Herein, we report a new strategy for fabricating CMS membranes with a 100 nm-thick ultrathin active layer using poly(furfuryl alcohol) (PFA) as a carbon precursor and carbon nanotubes (CNTs) as nanoscaffolds. CNT networks are deposited on a porous substrate as nanoscaffolds, which guide PFA solution to effectively spread over the substrate and form a continuous layer, minimizing the penetration of PFA into the pores of the substrate. After pyrolysis process, the CMS membranes with 100-1000 nm-thick active layer can be obtained by adjusting the CNT loading. The 322 nm-thick CMS membrane exhibits the best trade-off between the gas permeance and selectivity, a H2 permeance of 4.55 × 10-8 mol m-2 s-1 Pa-1, an O2 permeance of 2.1 × 10-9 mol m-2 s-1 Pa-1, and an O2/N2 ideal selectivity of 10.5, which indicates the high quality of the membrane produced by this method. This work provides a simple, efficient strategy for fabricating ultrathin CMS membranes with high selectivity and improved gas flux.

AB - Carbon molecular sieve (CMS) membranes have shown great potential for gas separation owing to their low cost, good chemical stability, and high selectivity. However, most of the conventional CMS membranes exhibit low gas permeance due to their thick active layer, which limits their practical applications. Herein, we report a new strategy for fabricating CMS membranes with a 100 nm-thick ultrathin active layer using poly(furfuryl alcohol) (PFA) as a carbon precursor and carbon nanotubes (CNTs) as nanoscaffolds. CNT networks are deposited on a porous substrate as nanoscaffolds, which guide PFA solution to effectively spread over the substrate and form a continuous layer, minimizing the penetration of PFA into the pores of the substrate. After pyrolysis process, the CMS membranes with 100-1000 nm-thick active layer can be obtained by adjusting the CNT loading. The 322 nm-thick CMS membrane exhibits the best trade-off between the gas permeance and selectivity, a H2 permeance of 4.55 × 10-8 mol m-2 s-1 Pa-1, an O2 permeance of 2.1 × 10-9 mol m-2 s-1 Pa-1, and an O2/N2 ideal selectivity of 10.5, which indicates the high quality of the membrane produced by this method. This work provides a simple, efficient strategy for fabricating ultrathin CMS membranes with high selectivity and improved gas flux.

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KW - carbon nanotube

KW - gas separation

KW - membrane preparation

KW - nanoscaffold

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DO - 10.1021/acsami.8b04481

M3 - Article

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SP - 20182

EP - 20188

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

SN - 1944-8244

IS - 23

ER -