Synthesis of vertically aligned flower-like morphologies of BNNTs with the help of nucleation sites in Co–Ni alloy

Ahmad, Pervaiz; Khandaker, Mayeen Uddin; Amin, Yusoff Mohd

doi:10.1016/j.mssp.2015.04.017

Cited by 11 publications

(4 citation statements)

References 32 publications

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“…Accordingly, (101) seen in reacted tubes must arise from BN coatings (Figure a). Third, Raman profile at 1320–1360 cm –1 can be deconvoluted into two peaks at 1328 and 1351 cm –1 ; the former is the D-band from CNTs, and E 2g mode of h-BN is for the latter (Figure b). − …”

Section: Resultsmentioning

confidence: 99%

“…3b). [22][23][24] We find that BN coatings truly promote oxidative resistance and improvement is supported by TGA (Fig. 4) At T < 500°C, CNT weight loss is small and comes from water evaporation and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 6 burning of carbonaceous impurities at tube surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…The study indicates that BN nanotubes are isoelectronic and their FE characteristics include a single slope in F–N plot, stable J , and low oxidative damages . Production of BN nanotubes however is difficult and current techniques rely on discharge, laser heating, pyrolysis, and C/BN substitution. − Other methods have also been developed to generate BN nanotubes in a large scale, such as catalytic chemical vapor deposition − and Ar assisted thermal reduction . In fact, FE proceeds mainly through surface states and making of BN nanotubes is unnecessary.…”

Section: Introductionmentioning

confidence: 99%

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Hexagonal Boron Nitride Coated Carbon Nanotubes: Interlayer Polarization Improved Field Emission

Chang

Tsai

Lin

et al. 2015

ACS Appl. Mater. Interfaces

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Coating of h-BN onto carbon nanotubes induces polarization at interfaces, and charges become localized at N and C atoms. Field emission of coated tubes is found to be highly stable, and current density fluctuates within 4%. Study further reveals that the electric field established between coatings and tubes facilitates charge transfer across interfaces and electrons are emitted through occupied and unoccupied bands of N and B atoms.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hexagonal Boron Nitride Coated Carbon Nanotubes: Interlayer Polarization Improved Field Emission

Chang

Tsai

Lin

et al. 2015

ACS Appl. Mater. Interfaces

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“…Similar to graphene that has a large number of edges or defects, some defects such as boron and nitrogen vacancies are often detected or inevitable during the synthesis of h-BNNSs or hexagonal boron nitride nanotubes (h-BNNTs) ,− which often play an important role in the catalysis. − For example, Jin et al reported that the defects such as boron monovacancies indeed exist in h-BNNS . Interestingly, such defect sites have been previously demonstrated to possess active characteristics and readily accept foreign atoms or clusters such as Cu, Ag, Fe, Co, and nonmetal Si, transforming h-BNNSs from an inert material to a potentially active catalyst for ORR or CO oxidation. − Lyalin et al demonstrated theoretically that h-BNNSs with defect sites can possess catalytic activity for the ORR .…”

Section: Introductionmentioning

confidence: 99%

Defective Hexagonal Boron Nitride Nanosheet on Ni(111) and Cu(111): Stability, Electronic Structures, and Potential Applications

Gao

Wang

Lin

2016

ACS Appl. Mater. Interfaces

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Defective hexagonal boron nitride nanosheets (h-BNNSs) supported by Ni(111) and Cu(111) surfaces have been systematically studied in this work by first-principles methods. The calculation results show that various defects play an important role in enhancing the stability of h-BNNS/metal heterostructure. Importantly, significant electron transfer through the interface between metal substrate and h-BNNS to the defect sites can make h-BNNS more catalytically active. Using the oxygen reduction reaction (ORR) as a probe, it is shown that the binding energies of O2*, OH*, OOH*, and O* on h-BNNS/Cu(111) with a boron vacancy (VB) are quite similar to those observed on the Pt(111) surface, suggesting inert h-BNNS materials with defects can be functionalized by metal surfaces to become catalytically active for the ORR process. On the other hand, the reaction mechanism of CO oxidation on Ni(111) and Cu(111) supported h-BNNS with VB is systematically investigated. The h-BN/Cu(111) catalyst with a VB precovered by a CO species exhibits catalytic capacity for CO oxidation with a lower energy barrier compared with that on h-BN/Cu(111) without any defect. While on Ni(111) supported h-BNNS with a N vacancy, the defect site turns to be dominated by O2 and the energy barrier is significantly increased, indicating its dependence on the type of defect. This work will provide information for designing h-BN-based catalysts in heterogeneous catalysis.

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Electrospinning of BCNNTs/PVA/PEDOT composite nanofibers films for research thermoelectric performance

Jiang

Ban

et al. 2021

J of Applied Polymer Sci

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In recent years, the thermoelectric properties of one-dimensional boron nitride nanomaterials have gradually attracted widespread attention of researchers in the world. In this paper, boron carbon nitrogen based composite nanofiber films were prepared by electrospinning. It is found that the diameter of nanofibers decreases in BCNNTs/PVA/PEDOT composite films when electrospinning voltage rises, while diameter increases as PVA and BCNNTs concentration increase of electrospinning precursor solution. Finally, thermoelectric power factor is investigated of the composite nanofiber films. It is verified that thermoelectric properties of the films closely related to electrospinning quality. However, fiber density of single-layer BCNNTs/PVA/ PEDOT nanofiber film is too low, folding increase the density and thickness of multilayer BCNNTs/PVA/PEDOT nanocomposite fiber films, and the thermoelectric characteristics are significantly improved. The Seebeck coefficient can reach 3.62 mV/K and the power factor is 29.09 nW/mK 2 .

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Synthesis of vertically aligned flower-like morphologies of BNNTs with the help of nucleation sites in Co–Ni alloy

Cited by 11 publications

References 32 publications

Hexagonal Boron Nitride Coated Carbon Nanotubes: Interlayer Polarization Improved Field Emission

Hexagonal Boron Nitride Coated Carbon Nanotubes: Interlayer Polarization Improved Field Emission

Defective Hexagonal Boron Nitride Nanosheet on Ni(111) and Cu(111): Stability, Electronic Structures, and Potential Applications

Electrospinning of BCNNTs/PVA/PEDOT composite nanofibers films for research thermoelectric performance

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