Picosecond laser structuration under high pressures: Observation of boron nitride nanorods

Museur, L.; Petitet, J. P.; Michel, Jean-Pierre; Marine, W.; Anglos, Demetrios; Fotakis, C.; Kanaev, Andreï

doi:10.1063/1.3000457

Cited by 8 publications

(6 citation statements)

References 37 publications

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“…1 have been recently reported on photoluminescence and cathodoluminescence experiments of commercial hBN powder. 10,[39][40][41][42][43][44][45][46][47][48] However, in these publications, no distinctions were made between the broad band and structured emissions. We now assign the structured UV emission to impurities ͑probably C͒ and the broadband emission to deep DAP of strongly localized center.…”

Section: A Luminescence Around 4 Ev In Hbn Powder Samplesmentioning

confidence: 99%

“…1͑a͒ and 1͑b͔͒ has been reported in the past by numerous groups either in 10,43,46,47 or photoluminescence experiments. 10,14,[39][40][41][42]44,45,47,48 Some authors have assigned it to intrinsic luminescence of hBN molecular layers 47 or to phonon-assisted band-edge luminescence. 42 However, recent experiments 1 and theoretical calculations 34 indicate the hBN band-gap energy in the range from 6 to 6.5 eV that disables these interpretations.…”

Section: A Luminescence Of Polycrystalline Hbn Samplesmentioning

confidence: 99%

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Defect-related photoluminescence of hexagonal boron nitride

Museur

Feldbach²,

Kanaev³

2008

Phys. Rev. B

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234

227

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Photoluminescence of polycrystalline hexagonal boron nitride ͑hBN͒ was measured by means of time-and energy-resolved spectroscopy methods. The observed bands are related to donor-acceptor pair transitions, impurities, and structural defects. The excitation of samples by high-energy photons above 5.4 eV enables a phenomenon of photostimulated luminescence ͑PSL͒, which is due to distantly trapped conduction band electrons and valence band holes. These trapped charges are metastable and their re-excitation with low-energy photons results in anti-Stokes photoluminescence. The comparison of photoluminescence excitation spectra and PSL excitation spectra allows band analysis that supports the hypothesis of Frenkel-type exciton in hBN with a large binding energy.

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Section: A Luminescence Around 4 Ev In Hbn Powder Samplesmentioning

confidence: 99%

Section: A Luminescence Of Polycrystalline Hbn Samplesmentioning

confidence: 99%

Defect-related photoluminescence of hexagonal boron nitride

Museur

Feldbach²,

Kanaev³

2008

Phys. Rev. B

Self Cite

234

227

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“…Luminescence properties of high purity commercially available hBN microcrystal powders have been largely studied in cathodoluminescence [2][3][4][5] and photoluminescence [6][7][8][9][10][11][12][13][14] experiments. Due to the synthesis methods used, these powders are inherently contaminated by carbon, calcium and oxygen impurities.…”

Section: Therefore It Is Of Interest To Analyze and Compare Luminescmentioning

confidence: 99%

Photoluminescence properties of pyrolytic boron nitride

Museur

Kanaev

2009

J Mater Sci

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Abstract.We report on spectroscopic study of pyrolytic hBN (pBN) by means of time-and energyresolved photoluminescence methods. A high purity of pBN samples (though low crystallinity) allows complementary information about excited states involved into the luminescence process. We affirm our recent conclusions about the impurity-related nature of most of the fluorescence bands in microcrystalline hBN. In addition, a broad band centred at 3.7 eV previously not considered because of its superposition with an intense structured impurity emission is attributed to the radiative recombination of deep DAPs.3

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“…Boron carbide powders were milled for 100 h and subsequently treated with nitrogen at high temperature to produce BN nanorods . In another approach, Museur et al synthesized BN nanorods embedded in amorphous boron suboxides (B x O y ) through UV laser irradiation of a compacted BN powder pellet in a high‐pressure nitrogen environment …”

Section: Introductionmentioning

confidence: 99%

Laser‐Directed Assembly of Nanorods of 2D Materials

Ibrahim

Novodchuk

Mistry

et al. 2019

Small

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transparency thus connected networks of 1D nanomaterials [5] have been studied as a viable alternative to thin films of indium tin oxide, which suffer from drawbacks such as brittleness and indium scarcity. [6] Materials such as graphene and transition metal dichalcogenides (TMDs) exhibit excellent electrical properties due to their "flat" 2D chemical structure. Sheets or flakes of these materials can allow for large area coverage with high conductivity but typically at the expense of transparency. [7,8] An approach to improving transparency is utilizing these materials in 1D nanorod-like structures. Carbon nanotubes (CNTs) are the most popular 1D variant of graphene and have been utilized to form large area conducting films, although challenges remain with respect to their purification [9,10] and aggregation. [5] As an alternative to CNTs, the synthesis of carbon-based nanorods has been reported by utilizing arc discharge [11] and microwave plasma chemical vapor deposition (CVD) [12] methods. However, the arc discharge method requires an extensive filtering (Soxhlet extraction) and drying process, while the CVD method requires a high power and temperature (e.g., 850 °C). The growth of graphene nanoribbons has also been reported by ultrahigh vacuum thermal evaporation [13] and hydrothermal techniques, [14] yielding lengths of 20-450 nm and widths of 2-40 nm.In regards to TMDs, molybdenum disulfide (MoS 2 ) nanorods have been synthesized via a redox reaction in an aqueous solution (yielding a nanorod mixture of binary oxides (Mo x O y ) and binary sulfides (Mo x S y )), [15] hydrothermal synthesis, [16] and hydrothermal synthesis of MoO 3 nanorods combined with sulfurization. [17] Similar to MoS 2 , the synthesis of tungsten disulfide (WS 2 ) nanorods has been accomplished by lengthy hydrothermal [18,19] and sulfidation [20] methods. Zhang et al. used high energy ball milling of WS 2 powder for 122 h, after which the powder was used as a precursor in a hydrothermal reaction for nanorod growth. [21] Ball milling methods have also been used to produce boron nitride (BN) nanorods. Boron carbide powders were milled for 100 h and subsequently treated with nitrogen at high temperature to produce BN nanorods. [22][23][24] In another approach, Museur et al. synthesized BN nanorods embedded in amorphous boron suboxides (B x O y ) through UV laser irradiation of a compacted BN powder pellet in a high-pressure nitrogen environment. [25] Table 1 summarizes these previous efforts to fabricate nanorods of 2D materials. Many of these methods require Herein, the previously unrealized ability to grow nanorods and nanotubes of 2D materials using femtosecond laser irradiation is demonstrated. In as short as 20 min, nanorods of tungsten disulfide, molybdenum disulfide, graphene, and boron nitride are grown in solutions. The technique fragments nanoparticles of the 2D materials from bulk flakes and leverages molecular scale alignment by nonresonant intense laser pulses to direct their assembly into nanorods up to several micrometers i...

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Picosecond laser structuration under high pressures: Observation of boron nitride nanorods

Cited by 8 publications

References 37 publications

Defect-related photoluminescence of hexagonal boron nitride

Defect-related photoluminescence of hexagonal boron nitride

Photoluminescence properties of pyrolytic boron nitride

Laser‐Directed Assembly of Nanorods of 2D Materials

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