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Multi-dimensional templated synthesis of hierarchical Fe2O3/NiO composites and their superior ethanol sensing properties promoted by nanoscale p–n heterojunctions

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Abstract

A hierarchical NiO-based nanostructure, constructed from multi-dimensional building blocks, was fabricated by a synthesis method based on electrospinning and solution phase reaction. Fe was incorporated into the NiO nanostructure with highly uniform distribution via ion exchange reaction. A series of Fe2O3/NiO composites with different compositions were successfully synthesized with the hierarchical architecture well preserved. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and inductively coupled plasma-optical emission spectrometry (ICP-OES) were used to characterize the structure and to confirm the formation mechanism of the synthesized products. The gas sensing properties of the Fe2O3/NiO hierarchical composites were systematically investigated. The optimized composition of Fe2O3/NiO shows superior sensing performance towards ethanol, such as high sensitivity, fast response/recovery speed and good selectivity. The high gas sensing performance of the sensing material was mainly due to the completeness of the heterojunction assembly between n-type Fe2O3 and p-type NiO, as well as the amplification effect caused by assembling the heterojunctions on the nanoscale.

Graphical abstract: Multi-dimensional templated synthesis of hierarchical Fe2O3/NiO composites and their superior ethanol sensing properties promoted by nanoscale p–n heterojunctions

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Article information


Submitted
28 Oct 2019
Accepted
22 Dec 2019
First published
23 Dec 2019

Dalton Trans., 2020, Advance Article
Article type
Paper

Multi-dimensional templated synthesis of hierarchical Fe2O3/NiO composites and their superior ethanol sensing properties promoted by nanoscale p–n heterojunctions

S. Dong, D. Wu, W. Gao, H. Hao, G. Liu and S. Yan, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04185K

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