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Influence of oxidation state on water solubility of Si nanoparticles prepared by laser ablation in water

机译：氧化态对激光烧蚀制备的Si纳米颗粒在水中的溶解度的影响

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摘要

Femtosecond laser fragmentation from preliminarily prepared water-dispersed Si microcolloids was used to synthesize bare (ligand-free) spherical silicon nanoparticles (Si-NPs) with low size dispersion and controllable mean size from a few nm to several tens of nm. In order to control the oxidation state of Si-NPs, the fragmentation was performed in normal oxygen-saturated water (oxygen-rich conditions) or in water disoxygenated by pumping with noble gases (Ag, He) before and during the experiment (oxygen-free conditions). XPS and TEM studies revealed that Si-NPs were composed of Si nanocrystals with inclusions of silicon oxide species, covered by SiO_x(l < x < 2) shell, while the total oxide content depended whether Si-NPs were prepared in oxygen-rich or oxygen-free conditions. When placed into a dialysis box, water-dispersed Si-NPs rapidly dissolved, which was evidenced by TEM data. In this case, NPs prepared under oxygen-rich conditions demonstrated much faster dissolution kinetics and their complete disappearance after 7-10 days, while the dissolution process of less oxidized counterparts could last much longer (25-30 days). Much fast dissolution kinetics of more oxidized Si-NPs was attributed to more friable structure of nanoparticle core due to the presence of numerous oxidation-induced defects. Laser-synthesized Si-NPs are of paramount importance for biomedical applications.
机译：飞秒激光从预先制备的水分散的硅微胶体中分裂出来，用于合成裸露的（无配体的）球形硅纳米粒子（Si-NPs），该纳米粒子具有较低的尺寸分散性和可控制的平均尺寸，从几纳米到几十纳米。为了控制Si-NPs的氧化态，在实验之前和实验过程中，在正常的氧气饱和水中（富氧条件下）或通过用稀有气体（Ag，He）泵送脱氧的水中进行裂解（氧免费条件）。 XPS和TEM研究表明，Si-NPs由包含氧化硅物种的Si纳米晶体组成，被SiO_x（l

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  • 会议地点 San Francisco(US)
  • 作者

    Yu. V. Ryabchikov; A. Al-Kattan; V. Chirvony; J.F. Sanchez-Royo; M. Sentis; V. Yu. Timoshenko; A. V. Kabashin;

  • 作者单位

    Aix-Marseille University, CNRS, LP3 UMR 7341, Campus de Luminy - Case 917, 13288, Marseille Cedex 9, France;

    Aix-Marseille University, CNRS, LP3 UMR 7341, Campus de Luminy - Case 917, 13288, Marseille Cedex 9, France;

    UMDO - Unidad Asociada a CSIC-IMM, Instituto de Ciencias de los Materiales, Universidad de Valencia, PO Box 22085, 46071 Valencia, Spain;

    UMDO - Unidad Asociada a CSIC-IMM, Instituto de Ciencias de los Materiales, Universidad de Valencia, PO Box 22085, 46071 Valencia, Spain;

    Aix-Marseille University, CNRS, LP3 UMR 7341, Campus de Luminy - Case 917, 13288, Marseille Cedex 9, France,National Research Nuclear University "MEPhI", Bio-Nanophotonic Lab., 115409 Moscow, Russia;

    National Research Nuclear University "MEPhI", Bio-Nanophotonic Lab., 115409 Moscow, Russia,M.V. Lomonosov Moscow State University, Physics Department, 119991 Moscow, Russia;

    Aix-Marseille University, CNRS, LP3 UMR 7341, Campus de Luminy - Case 917, 13288, Marseille Cedex 9, France,National Research Nuclear University "MEPhI", Bio-Nanophotonic Lab., 115409 Moscow, Russia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Si nanoparticles; femtosecond laser and fragmentation ablation in water; dissolution;

    机译：硅纳米粒子；飞秒激光和水中的碎片消融；解散;

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