Abstract
Abstract Nano-sized lanthanum hexaboride (LaB6)@ titanium dioxide (TiO2) particles with a core–shell structure has been successfully synthesized via a simple sol–gel method. LaB6@TiO2 particles were used as filler in polyvinyl butyral (PVB) matrix and performance of the TiO2 shell was evaluated. The core–shell nanoparticles were characterized for morphology and structure properties. X-ray diffraction and transmission electron microscope testing results confirm the formation of LaB6–TiO2 core–shell structure. In composite film, LaB6 improved the thermo-decomposing temperature of PVB matrix from 369.2 to 372.8°C, while the same amount of LaB6@TiO2 further increased the temperature to 381.0°C. In addition, TiO2 shell redshifted the maximum transmittance of the film from 605 to 669 nm in the visible region. In the near infrared region, its absorption peak shifted from 1,466 to 1,476 nm. This result will be helpful for the development of transparent and thermal insulating materials.
Highlights
As a thermionic electron emitter material, LaB6 is known for its excellent thermal stability, creep resistance, low work function, and so on
In order to detect the elements of the composite NPs, samples were analyzed by EDX, and the results are displayed in Figure 3c and d, corresponding to spots marked by the square and the circle in Figure 3a, respectively
LaB6@TiO2 NPs with a core–shell structure have been synthesized via a sol–gel-assisted hydrothermal method
Summary
As a thermionic electron emitter material, LaB6 is known for its excellent thermal stability, creep resistance, low work function, and so on. Up to now LaB6 is found to possess higher electronic emissivity than other materials and it has been extensively applied in various areas, such as electron lithography, high resolution optical system, and coating film for resistor [1,2,3,4]. The metal-like plasmonic material lanthanum hexaboride (LaB6) exhibits strong surface plasmon resonance absorption in the near infrared (NIR) region after being reduced to the nanoscale [5,6]. It indicates that LaB6 absorbs the NIR light, while maintaining high transparency in visible region. Different forms of the nanoparticles (NPs) like filler or coating of polymer films have found applications in glass curtain wall and automotive glass [8,9]
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