研究目的
To develop a novel photocatalyst for decomposing organic pollutants by producing high-pressure phases of TiO2 at ambient conditions using nebulizer spray pyrolysis, and to study their structural, morphological, optical, electrical, and photocatalytic properties.
研究成果
Highly crystalline TiO2-II thin films were successfully deposited using nebulizer spray pyrolysis, showing dependence on substrate temperature. Films exhibit suitable optical bandgap and electrical properties. Photocatalytic degradation of methylene blue achieved up to 90% efficiency, demonstrating the potential of TiO2-II phase for environmental applications. Future work should focus on optimizing the synthesis and exploring other applications.
研究不足
The formation mechanism of high-pressure phases is not fully resolved. The study is limited to specific substrate temperatures and precursor conditions. Potential issues include re-evaporation at high temperatures and substrate effects on film properties.
1：Experimental Design and Method Selection:
The study uses nebulizer spray pyrolysis (NSP) technique to deposit TiO2 thin films at varying substrate temperatures (200–500 °C) to induce high-pressure phases. Titanium (IV) isopropoxide is used as the precursor with acetylacetone and hydrochloric acid for stabilization and hydrolysis control.
2：Sample Selection and Data Sources:
Microscope glass slides are used as substrates, cleaned and prepared before deposition. The precursor solution is prepared by mixing specific volumes of reagents.
3：List of Experimental Equipment and Materials:
Equipment includes a nebulizer spray pyrolysis setup, X-ray diffractometer (PANalytical Xpert Pro MP), field emission scanning electron microscope (JEOL JSM-6701 F), UV-Visible spectrophotometer (Thermo Scientific Evolution Bio 260), Hall effect measurement system, and equipment for temperature-dependent resistivity measurements. Materials include titanium isopropoxide, acetylacetone, hydrochloric acid, doubly distilled water, and methylene blue dye.
4：Experimental Procedures and Operational Workflow:
The precursor solution is sprayed onto heated substrates with controlled carrier gas pressure. Films are characterized structurally, morphologically, optically, and electrically. Photocatalytic activity is assessed by degrading methylene blue dye under visible light irradiation, measuring concentration changes over time.
5：Data Analysis Methods:
Structural analysis via XRD, morphological analysis via SEM, optical analysis via UV-Vis spectroscopy and Tauc's plot for bandgap, electrical analysis via Hall effect and resistivity measurements, and photocatalytic efficiency calculation using pseudo-first-order kinetics.
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