Spectroscopic Identification of Neurotoxin Tetramethylenedisulfotetramine (TETS) Captured by Supramolecular Receptor β-Cyclodextrin Immobilized on Nanostructured Gold Surfaces
Figure 3
Core-level XPS of N 1s (a), S 2p (b), Au 4f (c), and C 1s (d) of the TETS/HEXS CD inclusion complex on the different surfaces of a Klarite substrate. On each of the core-level spectra, the top (black) curve is taken from the SERS-active area and the bottom (red) curve is from the non-SERS-active flat Au surface. The molecule shown in (a) is that of TETS and the thiolated portion of a β-CD molecule is shown in (d). The arrows indicate the functional groups that are responsible for the observed XPS core-level peaks.
