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Facile synthesis of SiO2@TiO2 hybrid NPs with improved photocatalytic performance
摘要： SiO2@TiO2 hybrid nanoparticles (NPs) were successfully prepared via a simple solvothermal approach using tetrabutyl titanate (Ti(OBu)4) as a titanium source. The morphology and crystal structure of the sample were characterised by scanning electron microscope, transmission electron microscope, and X-ray diffraction. The photocatalytic properties of SiO2@TiO2 hybrid NPs were also investigated in detail. The results showed that the layers of TiO2 NPs have been successfully coated onto the uniform silica sphere and transformed into anatase after calcination at 500°C. In addition, the photocatalytic activity of the as-obtained product was higher than that of the commercial P25-TiO2. The method for producing hybrid NPs has potential applications in building various types of hybrid NPs.
关键词： SiO2@TiO2 hybrid nanoparticles,photocatalytic performance,solvothermal approach,anatase titanium dioxide
更新于2025-09-23 15:21:21
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Laser‐Assisted, Large‐Area Selective Crystallization and Patterning of Titanium Dioxide Polymorphs
摘要： While ubiquitous in multiple industrial applications, the widespread use of solution-based precursors for crystalline titanium dioxide (TiO2) for optoelectronic device integration remains limited due to its high processing temperature. This limitation generates material compatibility issues and complicates the fabrication steps, especially for low-temperature substrates used in flexible hybrid electronics and low-cost photovoltaics. It is currently possible to crystallize TiO2 at lower processing temperatures, but it requires a carefully-controlled atmosphere or metallic doping of the amorphous precursor and can only achieve a low-yield conversion of the precursor. This paper presents a qualitative method for the processing of an amorphous photo-sensitive precursor in order to achieve high-yield conversion to highly-crystalline TiO2 at room-temperature and in ambient environment without added dopants using a low-energy laser. Moreover, it demonstrates the ability to controllably convert locally to anatase or rutile TiO2 only by adjusting the laser power density. This work shows real potential for the additive manufacturing of TiO2 structures for photo-catalysis, printable flexible hybrid electronics and low-cost photovoltaics using low-energy laser processing that is compatible with heat sensitive materials and flexible substrates.
关键词： rutile,anatase,titanium dioxide,laser-assisted conversion
更新于2025-09-11 14:15:04