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Highly Active Co‐Based Catalyst in Nanofiber Matrix as Advanced Sensing Layer for High Selectivity of Flexible Sensing Device
Author(s) -
Wang Kang,
Li Jing,
Li Wei,
Wei Wei,
Zhang Hao,
Wang Lili
Publication year - 2019
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201800521
Subject(s) - nanofiber , nanomaterials , materials science , nanoparticle , heterojunction , active layer , nanotechnology , molecule , selectivity , catalysis , electrospinning , layer (electronics) , optoelectronics , polymer , chemistry , composite material , biochemistry , organic chemistry , thin film transistor
An efficient and economic sensing material for flexible chemical sensors is increasingly in great demand as a result of its potential application in the healthcare and environmental detection systems. Endowing the nanomaterials with high active facets serves as a promising method for the design of nanomaterials with advanced functionalities. New physicochemical properties of chemical sensor can be obtained by using high active facets nanoparticles combined in one‐dimensional (1D) nanofiber/wires. However, it remains a great challenge to conduct the development of 1D heterostructure sensing materials with high selectivity, in particular the ones that can perform under room temperature. Here, a high performance flexible sensing device based on Co 3 O 4 nanoparticles with specific (112) facet in α‐Fe 2 O 3 nanofiber is reported. The heterointerfaces and grain boundary allow the fast electrons transportation in sensing reactions and the (112) facets in Co 3 O 4 nanoparticles provide a large number of highly active sites where the selective absorption of ammonia gas molecules occurs. Consequently, the flexible gas sensor exhibits ultrahigh sensitivity (417%) and mechanical stability to ammonia gas molecules, which are proved by using density functional theory calculations.