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Picosecond laser structuration under high pressures: Observation of boron nitride nanorods
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10.1063/1.3000457
/content/aip/journal/jap/104/9/10.1063/1.3000457
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/9/10.1063/1.3000457
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

View of hBN sample after laser irradiation with pulse duration of 150 ps (a) 5 ps (b), and 0.45 ps (c). Ambient gas is at with traces of . , , (a) and 248 nm [(b)–(c)].

Image of FIG. 2.
FIG. 2.

Raman spectra (488 nm, 40 mW) of the laser-irradiated hBN samples. The irradiation conditions are 150 ps/266 nm, (a) and 0.45 ps/248 nm [(b)–(d)]; the laser fluence is above [(a) and (c)–(d)] and below (b) the ablation threshold. The ambient gas is at 500 bar [(a)–(c)] with oxygen content of 20 mbar (a) and [(b)–(c)]. Ne gas at 500 bar pressure is used instead of in (d).

Image of FIG. 3.
FIG. 3.

Raman spectra (488 nm) of the irradiated hBN samples (0.45 ps, 248 nm, , ambient gas at 500 bar, and oxygen pressure ), taken at laser power varied from 4 to 40 mW. Four reference spectra of bulk hBN, irradiated pyrolytic BN, multiwall BN nanotubes, and graphite (c) taken at 40 mW cw-laser power are presented in the upper part of the figure.

Image of FIG. 4.
FIG. 4.

TEM images [(a), (c), and (e)–(f)] and electron diffraction patterns [(b and (d)] of fresh [(a) and (b)] and irradiated [(c)–(f)] hBN samples. The irradiation condition are 5 ps/248 nm, , ; ambient gas is at with traces of .

Image of FIG. 5.
FIG. 5.

TEM image (a) and electron diffraction pattern (b) of the hBN nanorod appeared in the irradiated area (irradiation condition as presented in Fig. 4).

Image of FIG. 6.
FIG. 6.

EELS analysis of hBN nanorod: (irradiation condition as presented in Fig. 4).

Image of FIG. 7.
FIG. 7.

Fluorescence excitation spectra (, not corrected for the primary monochromator efficiency) and fluorescence spectra of the original (a) and transformed (b) hBN samples .

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/content/aip/journal/jap/104/9/10.1063/1.3000457
2008-11-04
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Picosecond laser structuration under high pressures: Observation of boron nitride nanorods
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/9/10.1063/1.3000457
10.1063/1.3000457
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