Cathodic electropaint insulated tips for electrochemical scanning tunneling microscopy

Scott N. Thorgaard; Philippe Buhlmann

doi:10.1021/ac071307k

Cathodic electropaint insulated tips for electrochemical scanning tunneling microscopy

Scott N. Thorgaard, Philippe Buhlmann

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

A method of preparing tungsten tips insulated for in situ scanning tunneling microscopy (STM) work is presented. Tips were electrocoated at low applied voltages using an organic solution of the cathodic electropaint rather than the more frequently utilized electropaint emulsions. The insulated tips were then characterized using cyclic voltammetry and electrochemical STM (EC-STM). They displayed low Faradaic leakage currents under electrochemical conditions and provided for high-resolution STM imaging in electrolyte solution. Flat terraces on a monocrystalline Au surface and adlayers of 5,10,15,20-tetraphenyl-21H,23H-porphine cobalt(II) were imaged under potential control in dilute HClO₄ using the fabricated tips, and atomic or molecular resolution images were obtained in both cases. The developed procedure allows for the fast, reproducible generation of large numbers of electrically insulated tungsten tips suitable for EC-STM imaging experiments.

Original language	English (US)
Pages (from-to)	9224-9228
Number of pages	5
Journal	Analytical chemistry
Volume	79
Issue number	23
DOIs	https://doi.org/10.1021/ac071307k
State	Published - Dec 1 2007

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abstract = "A method of preparing tungsten tips insulated for in situ scanning tunneling microscopy (STM) work is presented. Tips were electrocoated at low applied voltages using an organic solution of the cathodic electropaint rather than the more frequently utilized electropaint emulsions. The insulated tips were then characterized using cyclic voltammetry and electrochemical STM (EC-STM). They displayed low Faradaic leakage currents under electrochemical conditions and provided for high-resolution STM imaging in electrolyte solution. Flat terraces on a monocrystalline Au surface and adlayers of 5,10,15,20-tetraphenyl-21H,23H-porphine cobalt(II) were imaged under potential control in dilute HClO4 using the fabricated tips, and atomic or molecular resolution images were obtained in both cases. The developed procedure allows for the fast, reproducible generation of large numbers of electrically insulated tungsten tips suitable for EC-STM imaging experiments.",

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AB - A method of preparing tungsten tips insulated for in situ scanning tunneling microscopy (STM) work is presented. Tips were electrocoated at low applied voltages using an organic solution of the cathodic electropaint rather than the more frequently utilized electropaint emulsions. The insulated tips were then characterized using cyclic voltammetry and electrochemical STM (EC-STM). They displayed low Faradaic leakage currents under electrochemical conditions and provided for high-resolution STM imaging in electrolyte solution. Flat terraces on a monocrystalline Au surface and adlayers of 5,10,15,20-tetraphenyl-21H,23H-porphine cobalt(II) were imaged under potential control in dilute HClO4 using the fabricated tips, and atomic or molecular resolution images were obtained in both cases. The developed procedure allows for the fast, reproducible generation of large numbers of electrically insulated tungsten tips suitable for EC-STM imaging experiments.

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Cathodic electropaint insulated tips for electrochemical scanning tunneling microscopy

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