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Keywords:

  • azo coupling;
  • diazonium salts;
  • electrografting;
  • organic layers;
  • surface modification
Thumbnail image of graphical abstract

So simple: The in situ synthesis of an aryldiazonium salt and an azo-aryldiazonium salt by azo coupling from sulfanilic acid and aniline is reported. Formation of a mixed organic layer is monitored by cyclic voltammetry and atomic force microscopy. A compact mixed layer is obtained with a global roughness of 0.4 nm and 10–15 % vertical extension in the range 1.5–6 nm.