期刊
LANGMUIR
卷 37, 期 19, 页码 5783-5794出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c00092
关键词
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资金
- Mexican Council for Science and Technology [611509]
- PLAS@PAR LabEx (Cluster of Excellence in Plasmas Physics in Paris of the programme Investissements d'avenir) [ANR-11IDEX-0004-02]
- Academy of Finland [296338]
- InStreams profiling grant [326291]
- Academy of Finland (AKA) [296338, 296338] Funding Source: Academy of Finland (AKA)
Pulsed laser ablation in liquid (PLAL) is a powerful method for producing nanoparticle colloids with long-term stability, and the stability is influenced by the reactivities and chemical equilibria at the nanoparticle/solvent interface. X-ray photoelectron spectroscopy can be used to evaluate the degree of nanoparticle surface oxidation and composition.
Pulsed laser ablation in liquid (PLAL) is a powerful method for producing nanoparticle colloids with a long-term stability despite the absence of stabilizing organic agents. The colloid stability involves different reactivities and chemical equilibria with complex ionic-specific effects at the nanoparticle/solvent interface which must be strongly influenced by their chemical composition. In this work, the surface composition of PLAL-produced gold nanoparticles in alkaline and saline (NaBr) water is investigated by X-ray photoelectron spectroscopy on free-flying nanoparticles, exempt from any substrate or radiation damage artifact. The Au 4f photoelectron spectra with a depth profiling investigation are used to evaluate the degree of nanoparticle surface oxidation. In alkaline water, the results preclude any surface oxidation contrary to the case of nanoparticles produced in NaBr solution. In addition, the analysis of Br 3d core-level photoelectron spectra agrees with a clear signature of Br on the nanoparticle surface, which is confirmed by a specific valence band feature. This experimental study is supported by DFT calculations, evaluating the energy balance of halide adsorption on different configurations of gold surfaces including oxidation or adsorbed salts.
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