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Cover Picture: Local Modulation of the Redox State of p-Nitrothiophenol Self-Assembled Monolayers Using the Direct Mode of Scanning Electrochemical Microscopy (ChemPhysChem 7/2009)
The cover picture illustrates the principle of molecular writing using direct-mode scanning electrochemical microscopy (SECM). The redox state of the end groups of a p-nitrothiophenol self-assembled monolayer (SAM) is selectively reduced either to the hydroxylamine/nitoso redox couple or to the amino group. Besides the writing procedure, W. Schuhmann et al. demonstrate on p. 1066 that SECM can also be utilized for visualization or reading of the generated microstructure in feedback mode using hexacyanoferrate as redox mediator.