Thermal stability of UV light emitting boron nitride nanowalls

Merenkov, I. S.; Burovihina, Alena A.; Zhukov, Yu. M.; Kasatkin, Igor; Medvedev, Oleg; Zvereva, Irina A.; Косинова, М. Л.

doi:10.1016/j.matdes.2016.12.063

Cited by 9 publications

(9 citation statements)

References 59 publications

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“…Present results suggest that the annealing-induced oxidation of BNNWs proceeded in the way described in our previous study [67]. The adsorption of O2 is followed by a reaction with nitrogen and boron atoms resulting in the oxygen atoms embedment into the h-BN structure with the B-O bonds formation.…”

Section: Thermal Stabilitysupporting

confidence: 71%

“…However, the intensity of the component at 191.8 eV was significantly increased by 23% and 30% for the maze-like and wavy nanowalls, respectively. This peak corresponds to N-B-O bonding and indicates oxidation of nanowalls during annealing [38,67]. The concentration of B-C bonds decreased for wavy nanowalls, possibly due to the deeper oxidation and reaction between carbon and oxygen atoms.…”

Section: Thermal Stabilitymentioning

confidence: 98%

“…This difference can likely be related to many defects originated on the bends and edges of nanowalls. In our previous study, we showed that the randomly oriented maze-like h-BN nanowalls synthesized from borazine at 700 °С demonstrated higher thermal stability in comparison with nanowalls obtained at lower temperature [67]. Therefore, the structure of nanowalls is a critical factor for thermal stability and oxidation resistivity.…”

Section: Thermal Stabilitymentioning

confidence: 99%

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Orientation-controlled, low-temperature plasma growth and applications of h-BN nanosheets

et al. 2018

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Dimensionality and orientation of hexagonal boron nitride (h-BN) nanosheets are promising to create and control their unique properties for diverse applications. However, low-temperature deposition of vertically oriented h-BN nanosheets is a significant challenge. Here we report on the low-temperature plasma synthesis of maze-like h-BN nanowalls (BNNWs) from a mixture of triethylamine borane (TEAB) and ammonia at temperatures as low as 400 °C. The maze-like BNNWs contained vertically aligned stacks of h-BN nanosheets. Wavy h-BN nanowalls with randomly oriented nanocrystalline structure are also fabricated. Simple and effective control of morphological type of BNNWs by the deposition temperature is demonstrated. Despite the lower synthesis temperature, thermal stability and oxidation resistivity of the maze-like BNNWs are higher than for the wavy nanowalls. The structure and oxidation of the nanowalls was found to be the critical factor for their thermal stability and controlled luminescence properties. Cytotoxic study demonstrated significant antibacterial effect of both maze-like and wavy h-BN nanowalls against E. coli. The reported results reveal a significant potential of h-BN nanowalls for a broad range of applications from electronics to biomedicine.

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Section: Thermal Stabilitysupporting

confidence: 71%

Section: Thermal Stabilitymentioning

confidence: 98%

Section: Thermal Stabilitymentioning

confidence: 99%

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Orientation-controlled, low-temperature plasma growth and applications of h-BN nanosheets

et al. 2018

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“…Demonstrations are generally absent for other types of polymers. Thus, advanced synthesis approaches, such as chemical vapor deposition, − atomic layer deposition, , and other methods − should be further considered for the synthesis of polymeric photocatalysts to regulate the crystallinity. Meanwhile, many of the methods can be developed in parallel with the synthesis of films on substrates as photoanodes for the OER and other PEC applications. − Surface oxidation reaction.…”

Section: Conclusion and Outlooksmentioning

confidence: 99%

Semiconducting Polymers for Oxygen Evolution Reaction under Light Illumination

et al. 2022

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Sunlight-driven water splitting to produce hydrogen fuel has stimulated intensive scientific interest, as this technology has the potential to revolutionize fossil fuel-based energy systems in modern society. The oxygen evolution reaction (OER) determines the performance of overall water splitting owing to its sluggish kinetics with multielectron transfer processing. Polymeric photocatalysts have recently been developed for the OER, and substantial progress has been realized in this emerging research field. In this Review, the focus is on the photocatalytic technologies and materials of polymeric photocatalysts for the OER. Two practical systems, namely, particle suspension systems and film-based photoelectrochemical systems, form two main sections. The concept is reviewed in terms of thermodynamics and kinetics, and polymeric photocatalysts are discussed based on three key characteristics, namely, light absorption, charge separation and transfer, and surface oxidation reactions. A satisfactory OER performance by polymeric photocatalysts will eventually offer a platform to achieve overall water splitting and other advanced applications in a cost-effective, sustainable, and renewable manner using solar energy.

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“…Potential BN synthesis precursors include borane, borazine, and melamine diborate (MD). Among them, the widely used MD was selected and characterized. − The precursor additives strengthened the necking between the particles and filled the voids between the h-BN flakes. This approach resulted in spherical particles without a secondary phase, preserving the properties of h-BN.…”

Section: Introductionmentioning

confidence: 99%

Strategic Fabrication of Robust Spherical Hexagonal Boron Nitride Particles for Thermally Conductive Applications

Yun,

Nam,

Cho

et al. 2023

ACS Appl. Eng. Mater.

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Hexagonal boron nitride (h-BN) has a layered structure similar to graphite and thus exhibits excellent thermal stability, electrical insulation, and chemical and corrosion resistance, resulting in a material of choice in numerous applications. However, its unique layered structure of h-BN hinders the dense packing of h-BN flakes, which poses challenges in practical applications. In this study, we present a novel and practical approach for fabricating micrometer-sized sphericalshaped h-BN particles with enhanced strength. This strategy involves fusing h-BN flakes with h-BN synthetic precursors, a homogeneous material without heterogeneous additives. The precursor reacts between the aggregated particles to form new h-BN bonds that connect the h-BN flakes, which improves the bonding strength. The self-densification and fabrication of h-BN particles can be achieved with a significantly lower temperature of 1100 °C without any pressing process. The precursor additives strengthened the necking between the particles and filled the voids between the h-BN flakes. By appropriately controlling the precursor content, voids within the composite can be alleviated. This approach resulted in spherical particles without a secondary phase, preserving the properties of h-BN. This effective strategy opens up new application possibilities in ultrafine thermally conductive systems, including the latest semiconductor stack packaging or micro-LED devices.

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Thermal stability of UV light emitting boron nitride nanowalls

Cited by 9 publications

References 59 publications

Orientation-controlled, low-temperature plasma growth and applications of h-BN nanosheets

Orientation-controlled, low-temperature plasma growth and applications of h-BN nanosheets

Semiconducting Polymers for Oxygen Evolution Reaction under Light Illumination

Strategic Fabrication of Robust Spherical Hexagonal Boron Nitride Particles for Thermally Conductive Applications

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