研究目的
Investigating the scalable synthesis of monoclinic VO2 microcrystals with reversible phase transition for applications in energy efficient smart windows, thermal actuators, and sensors.
研究成果
The two-step process of hydrothermal synthesis followed by argon annealing at 800°C successfully produced gram-scale monoclinic VO2 with 100% phase fraction and a reversible phase transition at 68°C. This method offers a scalable and cost-effective route for producing VO2 for industrial applications.
研究不足
The study is limited by the need for precise control over hydrothermal and annealing conditions to achieve 100% phase fraction of VO2 (M). The scalability of the process beyond gram scale and the integration of VO2 into practical devices remain challenges.
1：Experimental Design and Method Selection
The study combines hydrothermal synthesis with post-growth argon annealing to achieve gram-scale production of monoclinic VO2. The hydrothermal method was chosen for its scalability and cost-effectiveness, while argon annealing was used to mitigate intermediate phases and impurities.
2：Sample Selection and Data Sources
V2O5 precursor was used as the starting material. The synthesis involved varying hydrothermal growth times (20 to 60 hours) and annealing temperatures (600°C to 800°C) to optimize the phase fraction of VO2 (M).
3：List of Experimental Equipment and Materials
Equipment included a stainless steel autoclave for hydrothermal synthesis, a quartz tube furnace for annealing, and characterization tools such as XRD, FESEM, TEM, DSC, and Raman spectroscopy. Materials included V2O5, H2SO4, hydrazine hydrate, and NaOH.
4：Experimental Procedures and Operational Workflow
The process involved hydrothermal treatment of V2O5 at 220°C for varying times, followed by annealing in argon at different temperatures. Characterization was performed at each step to monitor phase and microstructure evolution.
5：Data Analysis Methods
Phase fraction was estimated from XRD patterns. Microstructural changes were analyzed using FESEM and TEM. Phase transition characteristics were studied using DSC and in-situ Raman spectroscopy.
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