| The electrochemical properties of alkyl modified Si(111) are examined in both aqueous and organic solvents. In particular, H-Si, undecylenyic acid, N-Hydroxysuccinimide, and aromatic hydrazides are tested. Capacitive properties, impedance measurements and band bending are correlated with dipole characteristics of the terminal group. The amount of band bending is demonstrated to be dependent on the polarity of a substance. A visible decrease in band bending is found with monolayers that withdraw electron density away from the electrode. These measurements are confirmed using solid-state Kelvin probe data. Impedance Measurements evaluated at flatband enable the determination of defects as a function of modification and surface treatment. It is found that defects increase with subsequent surface treatments. The insulating capacity of the monolayer is also examined utilizing impedance measurements. |
