2D-2D lattice engineering route for intimately coupled nanohybrids of layered double hydroxide and potassium hexaniobate: Chemiresistive SO2 sensor

Rohini B Shinde; Navnath S Padalkar; Shrikant V Sadavar; Shital B Kale; Vikas V Magdum; Yogesh M Chitare; Shirin P Kulkarni; Umakant M Patil; Vinayak G Parale; Hyung-Ho Park; Jayavant L Gunjakar

doi:10.1016/j.jhazmat.2022.128734

2D-2D lattice engineering route for intimately coupled nanohybrids of layered double hydroxide and potassium hexaniobate: Chemiresistive SO₂ sensor

J Hazard Mater. 2022 Jun 15:432:128734. doi: 10.1016/j.jhazmat.2022.128734. Epub 2022 Mar 17.

Affiliations

¹ Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India.
² Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea.
³ Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India. Electronic address: jlgunjakar.cir@dypgroup.edu.in.

PMID: 35334269
DOI: 10.1016/j.jhazmat.2022.128734

Abstract

2D-2D lattice engineering route is used to synthesize intimately coupled nanohybrids of layered double hydroxide (LDH) and potassium hexaniobate. The 2D-2D lattice engineering route is based on the electrostatically derived self-assembly of delaminated zinc-chromium-layered double hydroxide (ZC-LDH) nanosheets and potassium hexaniobate (HNb) nanosheets (ZCNb nanohybrids). The 2D-2D lattice-engineered ZCNb nanohybrids display expanded surface area, mesoporous anchored nanosheets network morphology, and intimate coupling between nanosheets. The 2D-2D lattice engineered ZCNb nanohybrids are used for the low temperature operated gas sensor. The ZCNb nanohybrids display outstanding selectivity for the SO₂, with the high response of 61.5% compared to pristine ZC-LDH (28.08%) and potassium niobate (8%) at 150 °C. Moreover, ZCNb sensors demonstrate superior response and recovery periods of 6 and 167 s at 150 °C, respectively. This result underscores the exceptional functionality of the ZCNb nanohybrids as efficient SO₂ sensors. Moreover, these findings vividly demonstrate that the 2D-2D lattice-engineered ZCNb nanohybrids are quite effective not only in improving the gas sensor activity but also in developing of new type of intimately coupled mesoporous LDH-metal-oxide based hybrid materials.

Keywords: Hexaniobate; Layered double hydroxide (LDH); Layered metal oxide; Protonation; SO(2) gas sensor.