Pore-Size-Tuned Graphene Oxide Membrane as a Selective Molecular Sieving Layer: Toward Ultraselective Chemiresistors
| Autor: | Hee-Jin Cho, Hamin Shin, Ji-Soo Jang, Dong Ha Kim, Il-Doo Kim, Won-Tae Koo, Jiyoung Lee |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nanoporous
Chemistry Graphene 010401 analytical chemistry Oxide 010402 general chemistry 01 natural sciences 0104 chemical sciences Analytical Chemistry law.invention Metal chemistry.chemical_compound Membrane Chemical engineering law visual_art visual_art.visual_art_medium Molecule Selectivity Layer (electronics) |
| Zdroj: | Analytical Chemistry. 92:957-965 |
| ISSN: | 1520-6882 0003-2700 |
| Popis: | Conventional graphene oxide (GO)-based gas membranes, having a narrow pore-size range of less than 0.3 nm, exhibit limited gas molecular permeability because of the kinetic diameters of most volatile organic and sulfur compound (VOCs/VSCs) molecules being larger than 0.3 nm. Here, we employ GO nanosheets (NSs) with a tunable pore-size distribution as a molecular sieving layer on two-dimensional (2D) metal oxide NSs-based gas sensors, i.e., PdO-sensitized WO3 NSs to boost selectivity toward specific gas species. The pore size, surface area, and pore density of GO NSs were simply manipulated by controlling H2O2 concentration. In addition, the pore size-tuned GO NSs were coated on cellulose filtering paper as a free-standing nanoporous membrane. Holey GO membrane showed a highly selective H2S permeability characteristic, exhibiting superior cross-selectivity to CH3COCH3 (0.46 nm), C2H5OH (0.45 nm), and C7H8 (0.59 nm) with larger kinetic diameters compared with H2S (0.36 nm). Such pore-size-tuned GO nanoporous layer is scalable and robust, highlighting a great promise for designing low cost and highly efficient gas-permeable membrane for outstanding selective gas sensing platform. |
| Databáze: | OpenAIRE |
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