研究目的
To develop a sol-gel assisted nanostructured SnO2 thin film sensor for low concentration ammonia detection at room temperature with high response, selectivity, and fast response/recovery times.
研究成果
The fabricated nanostructured SnO2 thin film sensor demonstrates high response, selectivity, and fast response/recovery times for ammonia detection at room temperature, with a low detection limit of 500 ppb. The addition of glycerine enhances porosity and surface area, contributing to improved performance. The sensor shows good reproducibility and stability, making it suitable for applications in medical diagnostics and environmental monitoring.
研究不足
The sensor's performance is affected by humidity, with response decreasing at higher humidity levels. Long-term stability and integration into large-scale systems may require further optimization. The study is limited to laboratory conditions and specific analytes.
1：Experimental Design and Method Selection:
The sensor is fabricated using sol-gel spin coating technique with tin(II) chloride, acetic acid, methanol, and glycerine as precursors to enhance porosity and nanostructure. The sol is aged, spin-coated on alumina substrates with interdigitated gold electrodes, and annealed to crystallize SnO
2：Sample Selection and Data Sources:
The sensing layer is characterized using XRD, XPS, AFM, and SEM for structural and morphological analysis. Gas sensing tests are performed with ammonia, acetone, methanol, and 2-propanol at concentrations from
3：5 ppm to 500 ppm. List of Experimental Equipment and Materials:
Equipment includes spin coater, magnetic stirrer, annealing furnace, XRD (Rigaku Miniflex 600), XPS (PHI 5000 Versa Prob II, FEI Inc.), AFM (NTEGRA Prima), SEM (ZEISS), and data acquisition unit (Keysight 34972A LXI). Materials include tin(II) chloride, acetic acid, methanol, glycerine, and alumina substrates with gold electrodes (Dropsens, Spain).
4：Experimental Procedures and Operational Workflow:
The sol is prepared by dissolving precursors, stirring, aging, spin-coating, drying, and annealing. Gas sensing involves exposing the sensor to analytes in a sealed chamber, measuring resistance changes, and calculating response.
5：Data Analysis Methods:
Response is calculated as % response = (ΔR / Rb) * 100, where ΔR is change in resistance and Rb is baseline resistance. Response and recovery times are measured, and selectivity is assessed against other analytes.
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X-ray Diffractometer
Miniflex 600
Rigaku
Used for structural characterization and phase composition analysis of the SnO2 thin film.
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X-ray Photoelectron Spectrometer
PHI 5000 Versa Prob II
FEI Inc.
Used for chemical composition analysis of the SnO2 thin film.
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Scanning Electron Microscope
ZEISS
ZEISS
Used for particle size and surface morphology analysis of the SnO2 thin film.
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Data Acquisition Unit
34972A LXI
Keysight
Used for resistance measurement during gas sensing experiments.
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Atomic Force Microscope
NTEGRA Prima
NT-MDT
Used for topography and surface morphology analysis of the SnO2 thin film.
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Spin Coater
Used for depositing the sol-gel solution onto substrates.
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Magnetic Stirrer
Used for stirring the sol solution to ensure homogeneity.
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Annealing Furnace
Used for heat treatment and crystallization of the SnO2 thin film.
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Alumina Substrate with Gold Electrodes
Dropsens
Used as the substrate for depositing the SnO2 thin film and for electrical connections.
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