Gas sensing behavior of metal-catecholates based MOFs

Jha, RK and Murali, M and Bhat, N (2022) Gas sensing behavior of metal-catecholates based MOFs. In: Nanotechnology, 33 (29).

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Abstract

We report on the usability aspect of triphenylene ligand-based metal-organic frameworks (MOF) as the potential gas sensing element in chemiresistive devices. Among various possibilities, we explored mono-metallic (Nickel-based) and bi-metallic (Nickel and copper-based) in room temperature gas sensing. Our investigations suggest that the chemiresistive device based on nickel catecholate MOFs were highly sensitive to ethyl alcohol gas in the concentration range of 5-100 ppm with decent sensing parameters such as response time, recovery time, repeatability, stability, etc. We also investigated bimetallic (Nickel and copper) catecholate based MOFs in gas sensing with different metallic content ratios (Cu: Ni:: 60:40 and 40:60). We found that the 1D Cu0.6Ni0.4-CAT nanostructures-based gas sensor to be selective towards H2 gas (0.2-7 ppm) at room temperature. We further explored the gas sensing abilities of Cu0.4Ni0.6-CAT based devices, and we found them to be selective towards NO2 gas. However, it was not possible to obtain the current versus concentration curve due to the gas molecules' aggressive chemisorption. However, the device could perform well (with a hysteresis error of 1/410) for detecting NO gas (which has the 2nd best absolute response after NO2). These results indicate that the ratio of metal ions in the MOF directly influences the sensing capabilities. Hence, rational synthetic variations in the metal content in MOF can lead to the design and develop highly selective and sensitive chemiresistive sensors. © 2022 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Nanotechnology
Publisher:	Institute of Physics
Additional Information:	The copyright for this article belongs to institute of Physics.
Keywords:	Ammonia; Chemical detection; Chemical sensors; Copper; Gases; Hydrogen; Metal ions; Nickel; Nickel compounds; Nitrogen oxides; Organometallics, Ammonia sensors; Catecholate; Gas sensing; Gas sensing behavior; Hydrogen sensor; Metal catecholates; Metallic nickel; Metalorganic frameworks (MOFs); Solvothermal; Triphenylenes, Gas detectors
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	20 Jun 2022 11:28
Last Modified:	20 Jun 2022 11:28
URI:	https://eprints.iisc.ac.in/id/eprint/73579

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