Thermal Stability of Cubic Boron Nitride Films Deposited by Chemical Vapor Deposition

Yu, Jie; Zheng, Zhenlong; Ong, H. C.; Wong, Kin Yau; Matsumoto, Shinya; Lau, Woon‐Ming

doi:10.1021/jp0610766

Cited by 19 publications

(10 citation statements)

References 31 publications

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“…Furthermore, the relatively higher thermal stability of BN could compensate the lower thermal stability of graphene-like carbon under harsher reaction conditions. [10] The encapsulated metal NPs are the cores of the chainmail catalysts, working like a heart pumping out electrons to the chain-mail surface. They are the origin of the reactivity and the source of the redistributed electrons.…”

Section: Viewpointmentioning

confidence: 99%

Chain Mail for Catalysts

2020

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Encapsulating transition‐metal nanoparticles inside carbon nanotubes (CNTs) or spheres has emerged as a novel strategy for designing highly durable nonprecious‐metal catalysts. The stable carbon layer protects the inner metal core from the destructive reaction environment and thus is described as chain mail for catalysts. Electron transfer from the active metal core to the carbon layer stimulates unique catalytic activity on the carbon surface, which has been utilized extensively in a variety of catalytic reaction systems. Here, we elaborate the underlying working principle of chain mail for catalysts as well as the key factors that determine their catalytic properties, and provide insights into the physicochemical nature of such catalyst architectures for further application of the strategy in rational catalyst design.

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Section: Viewpointmentioning

confidence: 99%

Chain Mail for Catalysts

2020

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“…[13][14][15][16] cBN/Si(001) films are potentially ideal substrate materials for various chemical or biological sensing applications, whereas the application of the cBN/Si(001) thin film is scarce, except for some applications in protective coatings and cutting tools, because of the difficulty in surface modification. Recently, we firstly reported that an cBN/Si(001) surface could be functionalized by a photochemical reaction to form an amine-terminated surface.…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering of 4-Aminothiophenol Adsorbed on Silver Nanosheets Deposited onto Cubic Boron Nitride Films

et al. 2010

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A simple method was found for the fabrication of silver nanosheets (AgNS) by the catalysis of gold nanoparticles (AuNP) on an amine-terminated cubic boron nitride (cBN) surface deposited on a Si(001) substrate in the presence of reductant. The morphology of the AgNS/AuNP/NH2-cBN/Si(001) sample was characterized by scanning electron microscopy and X-ray diffraction. The performance of the AgNS/AuNP/NH2-cBN/Si(001) sample as surface-enhanced Raman scattering (SERS) active substrate was evaluated by using 4-aminothiophenol (PATP) as the probe molecule. The SERS measurements showed that the maximum intensity was obtained on the AgNS/AuNP/NH2-cBN/Si(001) sample for 5 min silver deposition. Compared with the AuNP/NH2-cBN/Si(001) sample and a silver film/cBN/Si(001) prepared by the mirror reaction, the SERS signal of PATP was obviously improved on the above AgNS/AuNP/NH2-cBN/Si(001) film. The sensitivity and the stability of the AgNS/AuNP/NH2-cBN/Si(001) sample were also investigated.

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“…Boron nitride (BN) has many polymorphs, including sp 2 -bonded hexagonal BN (hBN), turbostratic BN (tBN) and sp 3 -bonded cubic BN (cBN) and wurtzite BN (wBN). Among them, cBN, structurally analogous to diamond, has strong covalent bonds which makes it an attractive material with excellent properties.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature solid state synthesis and in situ phase transformation to prepare nearly pure cBN

et al. 2011

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Cubic boron nitride (cBN) is synthesized by a low-temperature solid state synthesis and in situ phase transformation route with NH(4)BF(4), B, NaBH(4) and KBH(4) as the boron sources and NaN(3) as the nitrogen source. Furthermore, two new strategies are developed, i.e., applying pressure on the reactants during the reaction process and introducing the structural induction effect. These results reveal that the relative contents of cBN are greatly increased by applying these new strategies. Finally, almost pure cBN (∼90%) crystals are obtained by reacting NH(4)BF(4) and NaN(3) at 250 °C and 450 MPa for 24 h, with NaF as the structural induction material. The heterogeneous nucleation mechanism can commendably illuminate the structure induction effect of NaF with face center cubic structure. In addition, the induction effect results in the cBN nanocrystals presenting obvious oriented growth of {111} planes.

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Thermal Stability of Cubic Boron Nitride Films Deposited by Chemical Vapor Deposition

Cited by 19 publications

References 31 publications

Chain Mail for Catalysts

Chain Mail for Catalysts

Surface-Enhanced Raman Scattering of 4-Aminothiophenol Adsorbed on Silver Nanosheets Deposited onto Cubic Boron Nitride Films

Low-temperature solid state synthesis and in situ phase transformation to prepare nearly pure cBN

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