期刊
NANO LETTERS
卷 21, 期 1, 页码 353-359出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03733
关键词
temperature-programmed desorption; nanoparticles; metals; plasmonic sensing; molecules; adsorption
类别
资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [678941/SINCAT]
- Knut and Alice Wallenberg Foundation project [2015.0055]
Temperature-programmed desorption (TPD) is a method widely used in surface science to determine the bonding strength and coverage of molecular mono- or multilayers on a surface. Traditional TPD using mass spectrometric readout may have issues as the signal can come from other surfaces in the chamber, while plasmonic TPD directly measures the surface coverage of molecular species adsorbed on metal nanoparticles under ultrahigh vacuum conditions.
Temperature-programmed desorption (TPD) allows for the determination of the bonding strength and coverage of molecular mono- or multilayers on a surface and is widely used in surface science. In its traditional form using a mass spectrometric readout, this information is derived indirectly by analysis of resulting desorption peaks. This is problematic because the mass spectrometer signal not only originates from the sample surface but also potentially from other surfaces in the measurement chamber. As a complementary alternative, we introduce plasmonic TPD, which directly measures the surface coverage of molecular species adsorbed on metal nanoparticles at ultrahigh vacuum conditions. Using the examples of methanol and benzene on Au nanoparticle surfaces, the method can resolve all relevant features in the submonolayer and multilayer regimes. Furthermore, it enables the study of two types of nanoparticles simultaneously, which is challenging in a traditional TPD experiment, as we demonstrate specifically for Au and Ag.
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