研究目的
To investigate the gas sensing properties of PbTiO3 nanostructures, particularly their sensitivity, selectivity to ethanol, and resistance to humidity interference in ambient atmosphere.
研究成果
PbTiO3 nanoplates synthesized via hydrothermal method exhibit high sensitivity and selectivity to ethanol with negligible humidity interference, making them suitable for applications in breath alcohol detection and air quality monitoring in humid environments.
研究不足
The study is limited to PbTiO3-based sensors and specific gases; long-term stability and real-world application testing may require further investigation. The mechanism for selectivity is not fully explained and needs systematic study.
1：Experimental Design and Method Selection:
A one-step hydrothermal method was used to synthesize PbTiO3 nanostructures with different TiO2 sources. Gas sensing properties were measured using chemiresistive sensors.
2：Sample Selection and Data Sources:
PbTiO3 samples were synthesized from rutile, anatase, and P25 TiO2 powders. Gas sensing data were collected for various gases and humidity levels.
3：List of Experimental Equipment and Materials:
X-ray diffractometer (XRD; Rigaku D/max-RC), scanning electron microscope (SEM; Hitachi S-4800), high-resolution transmission electron microscope (HRTEM; Tecnai F20), Teflon-lined stainless autoclave, magnetic stirrer, micropipette, alumina substrate with Au electrodes. Chemicals: Pb(NO3)2, TiO2 powders (rutile, anatase, P25), KOH, deionized water.
4：Experimental Procedures and Operational Workflow:
Synthesis involved hydrothermal reaction at 200°C for 10h. Sensors were fabricated by drop-coating slurry onto substrates and annealing at 600°C. Gas sensing measurements were performed at 300-500°C with controlled gas concentrations and humidity.
5：0h. Sensors were fabricated by drop-coating slurry onto substrates and annealing at 600°C. Gas sensing measurements were performed at 300-500°C with controlled gas concentrations and humidity. Data Analysis Methods:
5. Data Analysis Methods: Gas response (S = Rg/Ra) was calculated. XRD, SEM, HRTEM, and DRIFT spectroscopy were used for characterization.
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X-ray diffractometer
D/max-RC
Rigaku
Identify phase structure of synthesized materials
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Scanning electron microscope
S-4800
Hitachi
Morphology observation of samples
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High-resolution transmission electron microscope
Tecnai F20
FEI
Analyze crystal plane orientation
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Teflon-lined stainless autoclave
Hydrothermal reaction vessel
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Magnetic stirrer
Mix solutions during synthesis
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Micropipette
Drop-coat slurry onto substrates
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Alumina substrate
Base for sensor electrodes
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Au electrodes
Conductive contacts for sensors
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