Facile synthesis of stoichiometric InOCl mesoporous material for high performance formaldehyde gas sensors

•Stoichiometric InOCl semiconducting material was synthesized via a facile sol-gel and calcination method.•InOCl shows high formaldehyde response, selectivity and stability.•The visible luminescence infers existence of abundant crystal defects in InOCl. In recent years, it is urgent and challenging...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2020-09, Vol.319, p.128078, Article 128078
Main Authors: Bian, Yuzhi, Nie, Linfeng, Wang, Anqi, Zhang, Le, Yue, Renliang, Han, Ning, Chen, Yunfa
Format: Article
Language:English
Subjects:
Acetone
Benzene
crystalline
Detection
Ethanol
Formaldehyde
gas sensor
Gas sensors
Gases
InOCl
Metal oxides
Nanomaterials
Photoelectrons
Pollutants
Recovery time
Selectivity
Sol-gel processes
Stoichiometry
Toluene
X ray photoelectron spectroscopy
X ray powder diffraction
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Summary:•Stoichiometric InOCl semiconducting material was synthesized via a facile sol-gel and calcination method.•InOCl shows high formaldehyde response, selectivity and stability.•The visible luminescence infers existence of abundant crystal defects in InOCl. In recent years, it is urgent and challenging to prepare highly sensitive and stable formaldehyde metal oxide gas sensing materials, as to in-situ detecting the indoor air pollutant. Here, stoichiometric InOCl mesoporous nanomaterial was synthesized by a facile sol-gel and successive calcination method. The dosage of HCl was found to be the key parameter for the stoichiometry of the InOCl, which was polycrystalline with mesopores of about 1.87 nm, as characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), N2 adsorption–desorption and X-ray photoelectron spectroscopy (XPS). Importantly, when used as formaldehyde gas sensor, it shows a high response of 45 to 50 ppm HCHO with response/recovery time of 18 s and 47 s at a low working temperature of 200 °C. In the meanwhile, it also exhibits high selectivity over other interfering gases such as 50 ppm ethanol, acetone, benzene and toluene, and good stability during 16 days gas sensing test. All these results show the promise of this mesoporous material for high performance formaldehyde gas sensing applications.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2020.128078