In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 9, No. 32 ( 2021), p. 17434-17441
Abstract:
A hybrid of GA@UiO-66-NH 2 was synthesized based on the covalent assembly of graphene acid (GA) and the amine functionalized UiO-66 metal–organic framework through amide bonds. This strategy endows the material with unique properties, such as hierarchical pores, a porous conductive network decorated with functional groups, a high specific surface area, and a good chemical and thermal stability. The resultant hybrid has an electrical resistance of ∼10 4 Ω, whereas the pristine GA and UiO-66-NH 2 possess an electrical resistance of ∼10 2 Ω and ∼10 9 Ω, respectively. The hybrid GA@UiO-66-NH 2 was demonstrated for CO 2 chemiresistive sensing and displayed a very fast response and quick recovery time of ∼18 s for 100% CO 2 , at 200 °C. While the pristine GA exhibits negligible response under the same conditions, GA@UiO-66-NH 2 exhibited a response of 10 ± 0.6%. Further, in situ temperature dependent Raman studies during CO 2 exposure confirm the presence of strong hydrogen bonding interaction between CO 2 and the amide functionality present on GA@UiO-66-NH 2 . The resulting gas sensing characteristics of GA@UiO-66-NH 2 are majorly attributed to the better interaction of CO 2 at the amide/amine functional groups and the readily accessible hierarchical pores. This design strategy opens new horizons in the development of covalently linked hybrids with hierarchical porous conductive networks which can help to improve the gas sensing properties of MOF-based materials.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2702232-8
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