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.

paper information

Sensors and Actuators B: Chemical Volume 352, Part 2, 1 February 2022, 131046

Received 14 July 2021, Revised 28 October 2021, Accepted 1 November 2021, Available online 5 November 2021, Version of Record 10 November 2021.

Authors: Rohini B. Shinde, Akash S. Patil, Shrikant V. Sadavar, Yogesh M. Chitare, Vikas V. Magdum, Navnath S. Padalkar, Umakant M. Patil, Saji T. Kochuveedu, Vinayak G. Parale, Hyung-Ho Park, Chandrakant D. Lokhande, Jayavant L. Gunjakar

DOI : https://doi.org/10.1016/j.snb.2021.131046