研究目的
To investigate the effect of various pH adjustment reagents on the hydrothermal synthesis of aluminum doped zinc oxide (AZO) and its near-infrared (NIR) absorption properties.
研究成果
The study successfully synthesized AZO with excellent NIR absorption properties using ammonia as the pH adjustment reagent. The use of urea as a pH-shift reagent during hydrothermal reaction further enhanced the NIR absorption properties. The initial state of Zn and Al ions in the precursor solution significantly affects the crystal phase of the product.
研究不足
The synthesis conditions, especially the temperature, were limited by the deformation of Teflon containers at temperatures above 240°C. The study also did not achieve nanoparticle synthesis, which is crucial for applications like infrared shielding films.
1：Experimental Design and Method Selection:
Hydrothermal synthesis was employed to synthesize AZO with various pH adjustment reagents (ammonia, TMAH, TEAH, TPAH, and urea). The crystal structure and NIR absorption properties of the synthesized powders were evaluated.
2：Sample Selection and Data Sources:
Precursor solutions were prepared using zinc nitrate hexahydrate and aluminum nitrate nonahydrate, adjusted to various pH levels with the pH adjustment reagents.
3：List of Experimental Equipment and Materials:
Teflon containers, stainless steel pressure vessels, XRD (Ultima IV, Rigaku), UV-Vis-NIR spectrophotometer (V-670, JASCO).
4：Experimental Procedures and Operational Workflow:
Precursor solutions were hydrothermally reacted at specified temperatures, followed by filtration, washing, and drying to obtain the synthesized powders.
5：Data Analysis Methods:
XRD for crystal structure analysis and UV-Vis-NIR spectrophotometry for reflectance measurements.
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