Coordination Polymer-Derived Multishelled Mixed Ni-Co Oxide Microspheres for Robust and Selective Detection of Xylene

Fengdong Qu; Wenan Shang; Dongting Wang; Shiyu Du; Tiju Thomas; Shengping Ruan; Minghui Yang

doi:10.1021/acsami.8b03487

Coordination Polymer-Derived Multishelled Mixed Ni-Co Oxide Microspheres for Robust and Selective Detection of Xylene

ACS Appl Mater Interfaces. 2018 May 2;10(17):15314-15321. doi: 10.1021/acsami.8b03487. Epub 2018 Apr 23.

Authors

Fengdong Qu^{1

2}, Wenan Shang², Dongting Wang², Shiyu Du², Tiju Thomas³, Shengping Ruan¹, Minghui Yang²

Affiliations

¹ State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering , Jilin University , Changchun 130012 , PR China.
² Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201 , PR China.
³ Department of Metallurgical and Materials Engineering , Indian Institute of Technology Madras , Chennai 600044 , Tamil Nadu , India.

PMID: 29652469
DOI: 10.1021/acsami.8b03487

Abstract

Multishell, stable, porous metal-oxide microspheres (Ni-Co oxides, Co₃O₄ and NiO) have been synthesized through the amorphous coordination polymer-based self-templated method. Both oxides of Ni and Co show poor selectivity to xylene, but the composite phase has substantial selectivity (e.g., S_xylene/ S_ethanol = 2.69) and remarkable sensitivity (11.5-5 ppm xylene at 255 °C). The short response and recovery times (6 and 9 s), excellent humidity-resistance performance (with coefficient of variation = 11.4%), good cyclability, and long-term stability (sensitivity attenuation of ∼9.5% after 30 days and stable sensitivity thereafter) all show that this composite is a competitive solution to the problem of xylene sensing. The sensing performances are evidently due to the high specific surface area and the nano-heterostructure in the composite phase.

Keywords: Ni−Co oxide; coordination polymers; gas sensor; multishell; xylene.