研究目的
To investigate the synthesis, structural, optical, and photocatalytic properties of nitrogen and iron co-doped titania films using pulsed laser deposition technique in nitrogen/methane media.
研究成果
The study concluded that nitrogen and iron co-doped titania films synthesized at 550 °C with 5% iron oxide content exhibited the highest photocatalytic activity under both UV and visible light. The presence of Ti–N and Fe–N bonds, along with optimal content of Ti–O–Fe fragments, was responsible for the improved photocatalytic performance. The films showed significant bandgap narrowing and efficient photogenerated charge separation.
研究不足
The study is limited by the sensitivity of the equipment used for XRD measurements, which may not detect low crystallinity phases. Additionally, the photocatalytic activity was tested only under specific conditions (UV and VIS irradiation), and the reproducibility of the films' properties may vary with different synthesis parameters.
1：Experimental Design and Method Selection:
The study utilized pulsed laser deposition (PLD) technique in a nitrogen/methane (N2/CH4) (5:1) media at 1 mbar to synthesize nitrogen and iron co-doped titania films. The films were deposited on glass substrates at temperatures of 450 or 550 °C.
2：Sample Selection and Data Sources:
Iron oxide–titania composite targets with different mass concentrations (2.5, 5, and 10 wt%) of Fe2O3 or Fe3O4 were used. The films were characterized using SEM, EDS, XRD, Raman spectroscopy, XPS, and photocatalytic activity tests.
3：5, 5, and 10 wt%) of Fe2O3 or Fe3O4 were used. The films were characterized using SEM, EDS, XRD, Raman spectroscopy, XPS, and photocatalytic activity tests.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A KrF* excimer laser (λ = 248 nm and τFWHM = 25 ns) operated at 20 Hz frequency repetition rate was used for PLD. Other equipment included a FEI Inspect S scanning electron microscope, Rigaku Ultima IV diffractometer, JASCO NRS-7200 Raman microscope, ESCALAB Xi+ XPS setup, and Lambda 35 UV–VIS spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The PLD experiments were carried out inside a stainless steel reaction chamber. The laser beam was directed at 45° on the target surface. The films were characterized for their morphology, elemental composition, phase analysis, and photocatalytic activity.
5：Data Analysis Methods:
The data were analyzed using Casa XPS software for XPS spectra, and the photocatalytic activity was estimated via the reduction reaction of toxic dichromate ions.
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