研究目的
To investigate the influence of ferroelectric domain configuration and Au nanoparticles on the photocatalytic activity of BaTiO3 fibers.
研究成果
BaTiO3 fibers calcined above 800°C exhibit ferroelectric properties that enhance photocatalytic activity, with single-domain structures outperforming multi-domain ones due to integrated internal electric fields. Au nanoparticles further improve activity via surface plasmon resonance, making them promising for photocatalysis.
研究不足
The study is limited to BaTiO3 fibers and Au nanoparticles; other materials or conditions are not explored. The critical size for domain transformation may vary, and the experiments are conducted under specific laboratory conditions, which may not fully represent all real-world applications.
1：Experimental Design and Method Selection:
The study uses a sol-gel-based electrospinning technique to synthesize BaTiO3 fibers, with calcination at different temperatures to vary phase structure and grain size. Au nanoparticles are loaded via photoreduction. Photocatalytic activity is evaluated by degrading rhodamine B (RhB) under UV-Vis light.
2：Sample Selection and Data Sources:
BaTiO3 fibers are prepared from barium acetate and tetrabutyl titanate, with polyvinylpyrrolidone as a binder. Samples are calcined at 600°C, 700°C, 800°C, and 900°C. Au loading is done on BT-800 and BT-900 fibers.
3：List of Experimental Equipment and Materials:
Equipment includes STA 449 F3 for TG-DSC, TECNAI G2 20 and JEOL 2011F for TEM/HRTEM/SAED/EDX, Smartlab for XRD, Leo-1530 for SEM, QUADRASORB SI for BET, U-4100 spectrophotometer for UV-Vis, CHI 660E electrochemical system for photocurrent, SPI4000&SPA300HV SPM for displacement measurement, and MFP-3D-SA PFM for domain imaging. Materials include barium acetate, acetic acid, tetrabutyl titanate, PVP, ethanol, HAuCl4, RhB, and others as specified.
4：Experimental Procedures and Operational Workflow:
Electrospinning is performed at 17 kV with a 1 ml/h rate. Fibers are calcined at specified temperatures. Au loading involves dispersing fibers with HAuCl4 and exposing to a 300 W mercury lamp. Photocatalysis involves stirring fibers with RhB solution, exposing to UV-Vis light, and measuring absorption at intervals.
5：Data Analysis Methods:
Data is analyzed using techniques such as XRD for phase identification, TEM for morphology, UV-Vis for band gap calculation, photocurrent measurements for charge separation efficiency, and kinetic analysis of RhB degradation rates.
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Transmission electron microscope
TECNAI G2 20
FEI
Used for TEM imaging and analysis.
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Transmission electron microscope
JEOL 2011F
JEOL
Used for TEM, HRTEM, SAED, and EDX analysis.
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X-ray diffractometer
Smartlab
Rigaku
Used for XRD measurements to analyze crystal structure.
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Scanning electron microscope
Leo-1530
Zeiss
Used for SEM studies to examine morphology.
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UV-Vis spectrophotometer
U-4100
HITACHI
Used for UV-Vis absorption and diffuse reflectance spectra measurements.
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Thermogravimetric-differential scanning calorimetry analyzer
STA 449 F3
Netzsch
Used for TG-DSC analysis to determine weight loss and thermal events.
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BET surface area analyzer
QUADRASORB SI
Quantachrome
Used to measure specific surface area.
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Electrochemical system
CHI 660E
Shanghai
Used for photocurrent measurements.
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Scanning probe microscopy system
SPI4000&SPA300HV
Seiko
Used for displacement measurement with conductive cantilever.
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Piezoresponse force microscope
MFP-3D-SA
Used for PFM to study domain structure.
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Mercury lamp
300 W
Used as light source for photoreduction and photocatalysis experiments.
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Xe lamp
300 W
Used as light source for photocurrent measurements.
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