Figure 4
From: A cyclodextrin-based approach for selective detection of catecholamine hormone mixtures
Surface analysis results of (top) FT-IR spectra and (bottom) XPS measurement at each step of the electrode functionalization: bare Au, cysteamine (thiol) coating, chlorobutyric acid (CA) treatment, and α -cyclodextrins (CDs) immobilization. Signature binding as well as key elements such as O 1 s, N 1 s, C 1 s and Cl 2p, distinguishes the surface coating at each functionalization step.