Silicon Nanocrystals Produced by Nanosecond Laser Ablation in an Organic Liquid

被引：60

作者：

Abderrafi, Kamal ^{[1
]}

Garcia Calzada, Raul ^{[1
]}

Gongalsky, Maxim B. ^{[2
]}

Suarez, Isaac ^{[1
]}

Abarques, Rafael ^{[1
]}

Chirvony, Vladimir S. ^{[1
]}

Timoshenko, Victor Yu ^{[2
]}

Ibanez, Rafael ^{[1
]}

Martinez-Pastor, Juan P. ^{[1
]}

机构：

[1] Univ Valencia, Inst Ciencia Mat, UMDO Unidad Asociada, CSIC IMM, Valencia 46071, Spain

[2] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 12期

关键词：

POROUS SILICON; GOLD NANOPARTICLES; SI NANOCRYSTALS; LIGHT-EMISSION; WATER; CONFINEMENT; NITROGEN; OXYGEN;

D O I：

10.1021/jp109400v

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Small (3-5 nm in diameter following HRTEM images) Si nanocrystals were produced in a two-stage process including (1) nanosecond laser ablation of a Si target in an organic liquid (chloroform) that results in formation of big composite polycrystalline particles (about 20-100 nm average diameter) and (2) ultrasonic post-treatment of Si nanoparticles in the presence of HP. The post-treatment is responsible for disintegration of the composite Si particles, release of small individual nanocrystals, and reduction of their size due to HF-induced etching of Si oxide. The downshift and broadening of the similar to S20 cm(-1) Raman phonon band of the small Si nanocrystals with respect to the bulk Si Raman band is consistent with the presence of similar to 4.5 nm Si nanocrystals. The photoluminescence spectra (450-900 nm) and decay kinetics of small Si nanocrystals were detected, and the possible origin of the luminescence is discussed.

引用

页码：5147 / 5151

页数：5

共 34 条

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