Multishelled NiO/NiCo2O4 hollow microspheres derived from bimetal-organic frameworks as high-performance sensing material for acetone detection

Qiong Chen; Yongheng Zhang; Shuyi Ma; Yuhua Wang; Peiyu Wang; Guoheng Zhang; Duojie Gengzang; Haiyan Jiao; Mingxiao Wang; Wanjun Chen

doi:10.1016/j.jhazmat.2021.125662

Multishelled NiO/NiCo₂O₄ hollow microspheres derived from bimetal-organic frameworks as high-performance sensing material for acetone detection

J Hazard Mater. 2021 Aug 5:415:125662. doi: 10.1016/j.jhazmat.2021.125662. Epub 2021 Mar 16.

Authors

Affiliations

¹ College of Electric Engineering, Key Laboratory for Electronic Materials of Northwest Minzu University, Northwest Minzu University, Lanzhou, Gansu 730030, PR China.
² Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, Gansu 730030, PR China.
³ Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou, Gansu 730030, PR China.
⁴ Postdoctoral Scientific Research Working Station of Beijing Science and Technology Innovation Research Center, Beijing 100020, PR China.
⁵ College of Electric Engineering, Key Laboratory for Electronic Materials of Northwest Minzu University, Northwest Minzu University, Lanzhou, Gansu 730030, PR China. Electronic address: wjchen@xbmu.edn.

PMID: 33761420
DOI: 10.1016/j.jhazmat.2021.125662

Abstract

Recently, tremendous research interest was stimulated to obtain advanced function materials with hierarchical structure and tailored chemical composition from metal-organic frameworks (MOFs) based precursors. Herein, Bimetal-organic frameworks of Ni-Co-BTC solid microspheres synthesized through hydrothermal method were acted as template to induce multishelled NiO/NiCo₂O₄ hollow microspheres by annealing treatment. When evaluated as gas sensing material, the optimal hybrid of NiO/NiCo₂O₄ (the molar ration of NiCo=1.5) multishelled hollow microspheres endowed a high sensitivity (17.86) to 100 ppm acetone with rapid response/recovery time (11/13 s) under low working temperature (160 °C) and the low detection limit reached 25 ppb. The enhanced mechanism was originated from the following aspects: the multishelled hollow architecture provided efficient diffusion path for gas molecules and sufficient active site for gas sensing reaction; the nanoscale p-p heterojunction created at NiO and NiCo₂O₄ nanoparticles interface amplified the resistance variation by tuning the potential barrier; the potent combination of the "chemical catalytic" effect of NiO and the "electrical catalytic" effect of NiCo₂O₄ improved the selective acetone detection.

Keywords: Acetone; Bimetal-organic frameworks; Gas sensor; Metal oxide semiconductor.

Publication types

Research Support, Non-U.S. Gov't