研究目的
To study the plasmonic interactions between silver nanoparticles and various rutile TiO2 facets to design a route towards an optimised polycrystalline film fabrication.
研究成果
The study demonstrates that the deposition of plasmonic silver particles on polycrystalline TiO2 films with high-angle grain boundaries results in larger Schottky barriers and better charge carrier separation than on monocrystalline TiO2 films. This interaction enhances the photoelectrochemical activity for water splitting under visible light illumination.
研究不足
The study focuses on the interactions between silver nanoparticles and rutile TiO2 facets, with a specific emphasis on grain boundary defects. The applicability of the findings to other metal-semiconductor systems or different TiO2 phases may require further investigation.
1：Experimental Design and Method Selection:
The study involved the hydrothermal synthesis of preferentially oriented [100] rutile TiO2 on a fluorine doped tin oxide (FTO) substrate, followed by silver photodeposition. Advanced Electron Microscopy and Electrochemical Impedance Spectroscopy (EIS) were used to study the interactions.
2：Sample Selection and Data Sources:
TiO2 films were prepared with and without HF as a directing agent. Silver was photodeposited on these films under different conditions.
3：List of Experimental Equipment and Materials:
Titanium(IV) butoxide, hydrochloric acid, hydrofluoric acid, sodium hydroxide, silver nitrate, sodium sulfate, FTO substrate, X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), EBSD system, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Potentiostat.
4：Experimental Procedures and Operational Workflow:
TiO2 films were synthesized hydrothermally, followed by silver photodeposition. The films were characterized using XRD, SEM, EBSD, Raman spectroscopy, and XPS. Photoelectrochemical measurements were conducted to evaluate the activity.
5：Data Analysis Methods:
Data from XRD, SEM, EBSD, Raman spectroscopy, XPS, and EIS were analyzed to understand the plasmonic interactions and photoelectrochemical activity.
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Titanium(IV) butoxide
Sigma-Aldrich
Used in the hydrothermal synthesis of TiO2 photoanodes.
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Hydrochloric acid
Merck
Used in the hydrothermal synthesis of TiO2 photoanodes.
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Hydrofluoric acid
Sigma-Aldrich
Used as a directing agent in the hydrothermal synthesis of TiO2 photoanodes.
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Silver nitrate
Ajax Finechem
Used for silver photodeposition on TiO2 films.
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FTO substrate
Tec 15
GreatCell Solar
Used as the substrate for TiO2 photoanodes.
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X-ray diffraction
PANalytical X’Pert PRO MPD
Used to examine the crystal structure of the TiO2 films.
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Field Emission Scanning Electron Microscopy
Zeiss ULTRA plus
Used to examine the morphological and lattice structural information of the TiO2 films.
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EBSD system
Oxford Instrument AZtec v3.0
Used for EBSD mapping of the samples.
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Raman spectroscopy
Renishaw InVia Reflex System spectrometer
Used for Raman spectroscopy of the samples.
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X-ray photoelectron spectroscopy
Specs SAGE 150 system
Used for XPS measurements of the samples.
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Potentiostat
eDAQ Potentiostat 466 system
Used for photoelectrochemical measurements.
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