研究目的
To develop a simple and efficient method for synthesizing hydrogenated TiO2 (H-TiO2) using an atmospheric-pressure plasma jet submerged in a titanium precursor solution, aiming to improve visible light absorption and electrical conductivity for environmental and optoelectronic applications.
研究成果
The submerged atmospheric-pressure plasma jet method successfully synthesized H-TiO2 with improved visible light absorption and electrical conductivity, attributed to decreased work function and narrowed band gap. This method offers advantages in terms of simplicity, rapid synthesis, and potential for mass production, making it promising for environmental and optoelectronic applications.
研究不足
The study does not address the long-term stability of H-TiO2 under operational conditions or the scalability of the synthesis method beyond laboratory scale. Additionally, the environmental impact of using HCl in the precursor solution is not discussed.
1：Experimental Design and Method Selection:
The study utilized an atmospheric-pressure plasma jet (APPJ) submerged in a TiOCl2 precursor solution for the synthesis of H-TiO2. The method was chosen for its simplicity, rapid synthesis time, and potential for mass production.
2：The method was chosen for its simplicity, rapid synthesis time, and potential for mass production. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The titanium precursor solution consisted of 40 vol% TiOCl2, 30 vol% HCl, and 30 vol% H2O. Commercial TiO2 powder (P25) was used for comparison.
3：2O. Commercial TiO2 powder (P25) was used for comparison. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The APPJ system included a 20-kHz medium-frequency power supply, a tungsten electrode, a quartz tube, and an aluminum rod anode. Other equipment included a centrifuge (DT5-2B), optical emission spectrometer (Spectra view 2100), HR-TEM (Tecnai G2 F30), HR-XRD (EMPYREAN), HR-XPS (MultiLab 2000), UPS (AXIS Ultra DLD), and UV–vis-NIR spectrophotometer (SolidSpec-3700DUV).
4：Experimental Procedures and Operational Workflow:
The APPJ was submerged in the TiOCl2 precursor solution, treated for 3 min, and the synthesized H-TiO2 was isolated by centrifugation, washed, and dried. The properties of H-TiO2 were then analyzed and compared to commercial TiO
5：Data Analysis Methods:
The synthesized H-TiO2 was characterized using various techniques including OES, HR-TEM, HR-XRD, HR-XPS, UPS, and UV–vis-NIR spectroscopy to evaluate its structural, optical, and electrical properties.
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HR-XPS
MultiLab 2000
Thermo Scientific
Used to examine the elemental composition and oxygen vacancies of H-TiO2.
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UV–vis-NIR spectrophotometer
SolidSpec-3700DUV
Shimadzu
Used to evaluate the optical properties of TiO2 and H-TiO2.
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HR-TEM
Tecnai G2 F30
FEI
Used to observe the morphology and lattice spacing of the synthesized H-TiO2 nanoparticles.
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HR-XRD
EMPYREAN
PANalytical
Used to analyze the crystal structures of TiO2 and H-TiO2.
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atmospheric-pressure plasma jet
Used for the synthesis of hydrogenated TiO2 by submerging in a titanium precursor solution.
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centrifuge
DT5-2B
Beijing Era Beili Co.
Used to isolate the synthesized H-TiO2 from the precursor solution.
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optical emission spectrometer
Spectra view 2100
K-MAC
Used to confirm excited various species generated from submerged APPJ in TiOCl2 precursor solution.
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UPS
AXIS Ultra DLD
KRATOS Inc.
Used to measure the work function of TiO2 and H-TiO2.
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