Photoluminescence from gas-suspended SiOx nanoparticles synthesized by laser ablation
Photoluminescence from gas-suspended SiOx nanoparticles synthesized by laser ablation
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DOI：
10.1063/1.121892
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发表时间：
1998-07-27
影响因子：
4
通讯作者：
Pennycook, SJ
中科院分区：
文献类型：
--
作者：
Geohegan, DB;Puretzky, AA;Pennycook, SJ
报道了通过将Si激光烧蚀到1-10 Torr He和Ar中形成的气体悬浮的直径为1-10 nm的SiOx颗粒的时间分辨光致发光（PL）光谱。三个光谱带（1.8，2.5和3.2 eV）类似于氧化多孔硅的PL测量，但具有明显的电子振动结构。用Z-对比透射电子显微镜成像和单个纳米颗粒的高分辨率电子能量损失谱线扫描确定颗粒尺寸和组成。最大化的紫色（3.2 eV）PL从气体悬浮的纳米颗粒与非原位SiO1.4整体颗粒化学计量。低温收集的气体悬浮的纳米粒子产生的网状聚集体膜表现出非常弱的FL。标准退火恢复强PL带无振动结构，但在其他协议与PL测量的气体悬浮的纳米粒子。(C)1998年美国物理学会。
Time-resolved photoluminescence (PL) spectra are reported for gas-suspended 1-10 nm diameter SiOx particles formed by laser ablation of Si into 1-10 Torr He and Ar. Three spectral bands (1.8, 2.5 and 3.2 eV) similar to PL from oxidized porous silicon were measured, but with a pronounced vibronic structure. Particle size and composition were determined with Z-contrast transmission electron microscopy imaging and high resolution electron energy loss spectroscopy linescans of individual nanoparticles. Maximized violet (3.2 eV) PL from the gas-suspended nanoparticles was correlated with an ex situ SiO1.4 overall particle stoichiometry. Cryogenically-collected gas-suspended nanoparticles produced web-like-aggregate films exhibiting very weak FL. Standard anneals restored strong PL bands without vibronic structure, but otherwise in agreement with the PL measured from the gas-suspended nanoparticles. (C) 1998 American Institute of Physics.