Abstract
In this work, silver film over silica nanosphere (AgFON) surfaces are shown to be thermally stable, SERS-active substrates that are suitable for use in ultrahigh vacuum (UHV) conditions. The metal FON surface is a materials general, cost-effective, and highly SERS-active surface. The SERS activity and thermal stability were investigated by adsorbing benzene, pyridine, and C60 onto the AgFON surface. We chose these adsorbates for the following reasons: (1) vibrational spectroscopy and temperature-programmed desorption (TPD) behavior of benzene adsorbed onto metal surfaces has been widely investigated and is a simple system to study, respectively; (2) characteristics of pyridine adsorption on the AgFON surface can be compared to a large body of previous studies; and (3) high-temperature studies of C60 adsorption can be performed. TPD demonstrates that the AgFON surface has two classes of adsorption sites: (1) those that mimic the behavior of single crystal surfaces and (2) defect sites with higher adsorba...
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