Polyoxotungstate intercalated self-assembled nanohybrids of Zn-Cr-LDH for room temperature Cl2 sensing

This article reports the preparation of mesoporous layered nanohybrids of zinc chromium layered double hydroxide (Zn-Cr-LDH) and polyoxotungstate (POW) anions via an exfoliation-reassembling process. The hybridization of Zn-Cr-LDH and POW anions leads to forming a layer-by-layer intercalated structu...

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Published in:Sensors and actuators. B, Chemical Chemical, 2022-02, Vol.352, p.131046, Article 131046
Main Authors: Shinde, Rohini B., Patil, Akash S., Sadavar, Shrikant V., Chitare, Yogesh M., Magdum, Vikas V., Padalkar, Navnath S., Patil, Umakant M., Kochuveedu, Saji T., Parale, Vinayak G., Park, Hyung-Ho, Lokhande, Chandrakant D., Gunjakar, Jayavant L.
Format: Article
Language:English
Subjects:
Ammonia
Anions
Chromium
Gas sensor
Hydrogen sulfide
Hydroxide
Hydroxides
Intercalation
LDH
Nanosheets
Nitrogen dioxide
Oxidation
Polyoxometalates
Room temperature
Selectivity
Self-assembly
Zinc
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Summary:This article reports the preparation of mesoporous layered nanohybrids of zinc chromium layered double hydroxide (Zn-Cr-LDH) and polyoxotungstate (POW) anions via an exfoliation-reassembling process. The hybridization of Zn-Cr-LDH and POW anions leads to forming a layer-by-layer intercalated structure with a randomly interconnected mesoporous nanoplate network composed of ‘restacked POW intercalated Zn-Cr-LDH nanosheets’ (Zn-Cr-WO). The gas-sensing performance of the pristine Zn-Cr-LDH and Zn-Cr-WO was investigated for oxidizing (NO2 and Cl2), and reducing (LPG, H2, H2S, CO and NH3) gases at room temperature. The Zn-Cr-WO nanohybrids displayed the highest selectivity towards Cl2. The Cl2 gas response for the pristine Zn-Cr-LDH is 25.2% which further increased to 66.8% after hybridization with POW anions. The Zn-Cr-WO nanohybrids showed fastest response and recovery times of 5 and 133 s, respectively, at room temperature. [Display omitted] •Mesoporous nanohybrids of polyoxotungstate intercalated Zn-Cr-LDH nanohybrids are prepared by exfoliation-reassembling.•The Zn-Cr-LDH-POW nanohybrids exhibits excellent Cl2 sensing properties at room temperature.•The remarkable Cl2 sensing performance is attributed to mesoporous structure and expanded gallery space.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2021.131046