Abstract
We have examined tetramethylthiourea (TMTU) adsorption on Au(111) with cyclic voltammetry, capacitance measurements, and in situ scanning tunneling microscopy (STM). Capacitance measurements indicate that TMTU is adsorbed over a wide potential range. A capacitance peak at higher potentials (ca. 650 mV vs SCE) is interpreted as arising from the displacement of TMTU by bisulfate/sulfate ions. High-resolution STM images show an ordered structure of TMTU on the gold surface. Three distinctive spots for each molecule are seen in the STM images. From these molecular resolution images a (3 × 3) structure for the TMTU adsorbate is deduced. Large changes are observed in the step and terrace morphology of the Au(111) substrate at potentials (+400 mV) slightly before the capacitance maximum assigned to TMTU desorption. The STM images indicate a slow etching of the gold surface at potentials slightly before the onset of TMTU desorption. This deduction has been further supported by inductively coupled plasma optical e...
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