期刊
LANGMUIR
卷 35, 期 36, 页码 11859-11871出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.9b02159
关键词
-
资金
- Mexican Council for Science and Technology [611509]
- Agence Nationale de la Recherche: CASTORS project [ANR-13-JS04-0002]
- Agence Nationale de la Recherche: PLAS@PAR project (Cluster of Excellence in Plasmas Physics in Paris - programme Investissements d'avenir) [ANR-11-IDEX0004-02]
- Academy of Finland
The surface chemistry of gold nanoparticles produced by the pulsed laser ablation in liquids method is investigated by X-ray photoelectron spectroscopy (XPS). The presence of surface oxide expected on these systems is investigated using synchrotron radiation in conditions close to their original state in solvent but free from substrate or solvent effects which could affect the interpretation of spectroscopic observations. For that purpose we performed the experiment on a controlled free-standing nanoparticle beam produced by combination of an atomizer and an aerodynamic lens system. These results are compared with those obtained by the standard situation of deposited nanoparticles on silicon substrate. An accurate analysis based on Bayesian statistics concludes that the existence of oxide in the free-standing conditions cannot be solely confirmed by the recorded core-level 4f spectra. If present, our data indicate an upper limit of 2.15 +/- 0.68% of oxide. However, a higher credence to the hypothesis of its existence is brought by the structureless valence profile of the free-standing beam. Moreover, the cross-comparison with the deposited nanoparticles case clearly evidences an important misleading substrate effect. Experiment with free-standing nanoparticles is then demonstrated to be the right way to further investigate oxidation states on Au nanoparticles.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据