Figure 3
From: Characterization of a gold coated cantilever surface for biosensing applications
Uncleaned and cleaned gold coated samples to test effectiveness of electrochemical cleaning protocol with XPS. X-Ray Photoelectron Spectroscopy (XPS) data are shown for the Au4f, C1s and O1s peaks for uncleaned (A) and cleaned (B) gold samples. The percent surface composition for the uncleaned gold surface is 43.7% gold, 41.2% carbon and 9.4% oxygen based on the survey scan. The gold peak can be increased to 61.7% by electrochemically cleaning the surface. Additionally, carbon and oxygen are decreased to 33.8% and 4.5% respectively.