Large Scale Growth and Characterization of Atomic Hexagonal Boron Nitride Layers

Li, Song; Ci, Lijie; Lu, Hao; Сорокин, Павел Б.; Jin, Chuanhong; Ni, Jie; Kvashnin, Alexander G.; Kvashnin, Dmitry G.; Lou, Jun; Yakobson, Boris I.; Ajayan, Pulickel M.

doi:10.1021/nl1022139

Cited by 2,404 publications

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“…The N 1s peak for N‐carbon can be deconvoluted into four contributions, that is, N1 (398.3 eV), N2 (399.9 eV), N3 (401.4 eV), and N4 (404.1 eV), which correspond to the pyridinic N, pyrrolic N, graphitic N, and oxidized N groups 12, 17, 39, 40, 41. A new peak observed at 397.6 eV for B,N‐carbon can be attributed to the N—B bond 42, 43. For B 1S, three B‐containing species can be clearly observed for B‐carbon, which are corresponded to the BC 3 (190.2 eV), BC 2 O (191.1 eV), and BCO 2 (192.3 eV) groups,14, 15, 44 while a new deconvoluted peak observed at 190.7 eV for B,N‐carbon is attributed to the B—N bond 42, 43, 45, 46, 47.…”

Section: Resultsmentioning

confidence: 99%

“…A new peak observed at 397.6 eV for B,N‐carbon can be attributed to the N—B bond 42, 43. For B 1S, three B‐containing species can be clearly observed for B‐carbon, which are corresponded to the BC 3 (190.2 eV), BC 2 O (191.1 eV), and BCO 2 (192.3 eV) groups,14, 15, 44 while a new deconvoluted peak observed at 190.7 eV for B,N‐carbon is attributed to the B—N bond 42, 43, 45, 46, 47. Based on the above analyses, B and N heteroatoms are successfully introduced into the carbon matrix (Figure 2), which is also supported by the C 1s and O 1s spectra (Figure S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

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B, N Codoped and Defect‐Rich Nanocarbon Material as a Metal‐Free Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions

et al. 2018

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The development of highly active, inexpensive, and stable bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts to replace noble metal Pt and RuO2 catalysts remains a considerable challenge for highly demanded reversible fuel cells and metal–air batteries. Here, a simple approach for the facile construction of a defective nanocarbon material is reported with B and N dopants (B,N‐carbon) as a superior bifunctional metal‐free catalyst for both ORR and OER. The catalyst is prepared by pyrolyzing the composites of ethyl cellulose and high‐boiling point 4‐(1‐naphthyl)benzeneboronic acid in NH3 atmosphere with an inexpensive Zn‐based template. The obtained porous B,N‐carbon with rich carbon defects exhibits excellent ORR and OER performances, including high activity and stability. In alkaline medium, B,N‐carbon material shows high ORR activity with an onset potential (E onset) reaching 0.98 V versus reversible hydrogen electrode (RHE), very close to that of Pt/C, a high electron transfer number and excellent stability. This catalyst also presents the admirable ORR activity in acidic medium with a high E onset of 0.81 V versus RHE and a four‐electron process. The OER activity of B,N‐carbon is superior to that of the precious metal RuO2 and Pt/C catalysts. A Zn–air battery using B,N‐carbon as the air cathode exhibits a low voltage gap between charge and discharge and long‐term stability. The excellent electrocatalytic performance of this porous nanocarbon material is attributed to the combined positive effects of the abundant carbon defects and the heteroatom codopants.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

B, N Codoped and Defect‐Rich Nanocarbon Material as a Metal‐Free Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions

et al. 2018

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“…[16] Moreover, it has excellent chemical stability in most aquatic environments. [17,18] Hexagonal boron nitride film (BNNF) (7−8 nm thick, ~20 layers) has been reported to slow down the corrosion of an underlying Cu substrate in a very dilute NaCl solution (0.1 M) for a few minutes.…”

Section: Publication Detailsmentioning

confidence: 99%

Atomically Thin Hexagonal Boron Nitride Nanofilm for Cu Protection: The Importance of Film Perfection

et al. 2016

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Coatings are routinely applied to protect metallic surfaces, and polymer coatings have been conventionally used where the thickness is not a dramatic issue.[1] For the next generation of nanoelectronics, nanoscale coatings are needed to accommo-date the compact design. 2D materials that can be fabricated into atomically thin film as a coating over the substrate can be a great choice. Graphene has recently been considered for this purpose, since it is robust and flexible, and the hexagonal hon-eycomb structure can effectively block any species, including helium.[2] Mixed results, however, have been reported. [3][4][5][6][7] Good short-term anticorrosion performance was observed, [3][4][5] but over time, accelerated Cu oxidation and corrosion in air were found in the presence of graphene compared to the bare Cu substrate. [8,9] This acceleration is likely due to the high con-ductivity that assists electron transfer in the two-component galvanic cell between Cu and graphene, facilitating oxygen reduction and Cu oxidation around the defects in the long run. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsKhan, M. Haque., Jamali, S. S., Lyalin, A., Molino, P. J., Jiang, L., Liu, H. Kun., Taketsugu Coatings are routinely applied to protect metallic surfaces, and polymer coatings have been conventionally used where the thickness is not a dramatic issue. [1] For the next generation of nano-electronics, nanoscale coatings are needed to accommodate the compact design. Twodimensional (2D) materials that can be fabricated into atomically thin film as a coating over the substrate can be a great choice. Graphene has recently been considered for this purpose, Submitted to 2 since it is robust and flexible, and the hexagonal honeycomb structure can effectively block any species, including helium. [2] Mixed results, however, have been reported. [3][4][5][6][7] Good shortterm anti-corrosion performance was observed, [3][4][5] but over time, accelerated Cu oxidation and corrosion in air were found in the presence of graphene compared to the bare Cu substrate. [8,9] This acceleration is likely due to the high conductivity that assists electron transfer in the two-component galvanic cell between Cu and graphene, facilitating oxygen reduction and Cu oxidation around the defects in the long run.Hexagonal boron nitride could, therefore, be considered for protection due to its insulating nature, [10][11][12][13] impermeability to small molecules (pore diameter 1.2 Å in the hexagon [14] ), robustness [15] , and transparency. [16] Moreover, it has excellent chemical stability in most aquatic environments. [17,18] Hexagonal boron nitride film (BNNF) (7−8 nm thick, ~20 layers) has been reported to slow down the corrosion of an underlying Cu substrate in a very dilute NaCl solution (0.1 M) for a few minutes. [19] BNNF (5 nm, i.e. ~15 layers, grown on Ni and then transferred to Cu) also improved the oxidation resistance of Cu substrate at 500 °C for 30 minutes. [20] As was learned from the case of graphe...

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“…The atomically thin crystalline, single layer h‐BN materials29, 30, 31 function as the intermediate layer and growth nuclei that provide not only an epitaxial intermediary between the substrate and the perovskite, but also as a cladding layer for better optical confinement in lasing due to its large bandgap. Furthermore, the h‐BN can also serve as a superior insulating dielectric layer (as compared to other layered materials like graphene, MoS 2 and black phosphor) for preventing shorts in practical devices 28, 32, 33.…”

Section: Introductionmentioning

confidence: 99%

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

et al. 2016

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Organic–inorganic metal halide perovskites have recently demonstrated outstanding efficiencies in photovoltaics as well as highly promising performances for a wide range of optoelectronic applications such as lasing, light emission, optical detectors, and even for radiation detection. Key to the realization of functional perovskite micro/nanosystems on the ubiquitous silicon optoelectronics platform is through sophisticated lithography. Despite the rapid progress made in halide perovskite lasing, direct lithographic patterning of perovskite films to form optical cavities on conventional substrates remains extremely challenging. This study realizes room‐temperature high‐quality factor whispering‐gallery‐mode lasing (Q ≈ 1210) from patterned lead halide perovskite microplatelets fabricated in periodic arrays on silicon substrate with micropatterned BN film as the buffer layer. By varying the size of the platelets, modal selectivity for single mode lasing can be achieved with different cavity sizes or by simply breaking the structural symmetry of the cavity through designing the pattern. Importantly, this work demonstrates a straightforward, versatile bottom‐up scalable strategy to realize high‐quality periodic perovskite arrays with variable cavity sizes for large‐area light‐emitting and optical gain applications.

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Large Scale Growth and Characterization of Atomic Hexagonal Boron Nitride Layers

Cited by 2,404 publications

References 41 publications

B, N Codoped and Defect‐Rich Nanocarbon Material as a Metal‐Free Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions

B, N Codoped and Defect‐Rich Nanocarbon Material as a Metal‐Free Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions

Atomically Thin Hexagonal Boron Nitride Nanofilm for Cu Protection: The Importance of Film Perfection

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

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