研究目的
Investigating the acetone sensing properties of pure and Al-doped ZnO made by flame spray pyrolysis (FSP).
研究成果
Al-doped ZnO exhibited high sensing response of 245, response time of ~3 s and sensitivity of S = 23 ppm-1 for the detection of 10 ppm acetone at an optimum operational temperature of 450 °C. The enhanced sensing properties are attributed primarily to a higher density of oxygen vacancies, higher carrier concentration and slightly larger specific surface area than that in Al-doped ZnO made by HT.
研究不足
The study focuses on the sensing properties of Al-doped ZnO NPs for acetone detection, with potential areas for optimization in terms of sensitivity and selectivity under varying humidity conditions.
1：Experimental Design and Method Selection
The study involves the synthesis of Al-doped ZnO nanoparticles (NPs) by flame spray pyrolysis (FSP) and hydrothermal method (HT), and their characterization for acetone sensing properties.
2：Sample Selection and Data Sources
Pure and Al-doped ZnO NPs were synthesized and characterized. Sensing measurements were conducted at 250 to 500 °C using a gas detecting system.
3：List of Experimental Equipment and Materials
Field-emission scanning electron microscope (FE-SEM; JEOL 7001F), X-ray diffraction (XRD, Ultima IV/ME 200DX, Rigaku), transmission electron microscopy (TEM, JEOL JEM ARM 200F), X-ray photoelectron spectroscopy (XPS, K-alpha Thermo VG), UV-visible spectrophotometer (UV-vis, V-650 JASCO), N2 adsorption-desorption analysis (Autosorb-iQ2ST/MP Quantachrome).
4：Experimental Procedures and Operational Workflow
The precursor solutions were supplied through the FSP nozzle and dispersed into a fine spray. The produced NPs were collected on a glass fiber filter. Sensor devices were fabricated by mixing the NPs with α-terpineol to form a paste and dispersed onto interdigitated Pt electrodes.
5：Data Analysis Methods
The sensing properties were measured using a combination of a current source (Keithley 6220) and a nanovoltmeter (Keithley 2182). The sensing response for acetone was calculated as: Response = (Rair – Rgas)/Rgas.
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Field-emission scanning electron microscope
JEOL 7001F
JEOL
Probing the shape and morphology of the as-prepared ZnO NPs
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X-ray diffraction
Ultima IV/ME 200DX
Rigaku
Characterizing the crystal structure and microstructure of the NPs
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Transmission electron microscopy
JEOL JEM ARM 200F
JEOL
Characterizing the microstructure of the NPs
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X-ray photoelectron spectroscopy
K-alpha Thermo VG
Thermo VG
Performing surface elemental analysis
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UV-visible spectrophotometer
V-650
JASCO
Examining the optical properties of the ZnO NPs
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Current source
Keithley 6220
Keithley
Measuring the sensing properties
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Nanovoltmeter
Keithley 2182
Keithley
Measuring the sensing properties
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N2 adsorption-desorption analysis
Autosorb-iQ2ST/MP
Quantachrome
Measuring the Brunauer-Emmett-Teller (BET) specific surface area of the NPs
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