研究目的
Investigating the UV-activated ethanol sensing responses at low temperatures using porous Zn2SnO4 nanofibers as a sensing active layer.
研究成果
The porous Zn2SnO4 nanofibers exhibited high response, good selectivity, and stability toward ethanol at low temperatures. The ethanol response was up to 32.5, and the calculated detection limit was as low as 1.6 ppm at 130 °C. Upon UV irradiation, a large number of electrons and holes were generated in the nanofibers. Consequently, a photoinduced O? species [O?(hν)] was produced through the reaction between photoinduced electrons and absorbed oxygen molecules.
研究不足
The long recovery time is mainly attributed the slow processes of the adsorption of oxygen and the formation of adsorbed oxygen species on the surface of Zn2SnO4 nanofibers. The dynamic testing method used in our case also contributes to the long response and recovery times.
1：Experimental Design and Method Selection:
Porous ternary Zn2SnO4 nanofibers were fabricated through an electrospinning technique.
2：Sample Selection and Data Sources:
Zn2SnO4 nanofibers were used as the sensing active layer.
3：List of Experimental Equipment and Materials:
X-ray diffractometer (XRD: Bruker D8 Advance), scanning electron microscope (SEM: Nova Nano-SEM450, Czech), transmission electron microscope (TEM: Tecnai G2 F20), nitrogen adsorption analyzer (ASAP 2020, Micromeritics, USA), X-ray photoelectron spectroscopy (XPS: VG Scientific, UK), Lambda 950 UV-Vis-NIR spectrophotometer, LED for UV irradiation (365 nm).
4：Experimental Procedures and Operational Workflow:
The sensor was fabricated by brushing the slurry onto an Ag-Pd electrode. The sensing characteristics were investigated via a dynamic testing method by using an intelligent gas sensing analysis system (CGS-4TPs, Beijing Elite Tech Co., Ltd., China).
5：Data Analysis Methods:
The sensing response (S) was defined as the ratio of the sensor resistance in air (Ra) to that in the test gas (Rg).
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X-ray diffractometer
Bruker D8 Advance
Bruker
Determining the crystalline structure of the Zn2SnO4 sample
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scanning electron microscope
Nova Nano-SEM450
Czech
Determining the morphological characteristics of the Zn2SnO4 sample
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transmission electron microscope
Tecnai G2 F20
Determining the morphological characteristics of the Zn2SnO4 sample
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nitrogen adsorption analyzer
ASAP 2020
Micromeritics
Estimating the surface area and pore structure of the nanofibers
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X-ray photoelectron spectroscopy
VG Scientific
UK
Analyzing the elemental compositions and chemical states of Zn2SnO4 nanofibers
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UV-Vis-NIR spectrophotometer
Lambda 950
Obtaining the UV-Vis diffuse reflectance spectrum of the nanofibers
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LED
UV irradiation (365 nm) in gas sensing measurements
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intelligent gas sensing analysis system
CGS-4TPs
Beijing Elite Tech Co., Ltd., China
Investigating the sensing characteristics via a dynamic testing method
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dynamic gas and liquid distribution system
DGL-III
Beijing Elite Tech Co., Ltd, China
Obtaining the test gas with the desired concentration
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