Investigations on Nanometer-Sized Ultramicroelectrodes(Ⅰ)——Fabrication, Characterization and Application of Ultramicrobandelectrode

Abstract

Abstract: The present paper reports the investigation and application of nanometer-sized gold band ul-tramicroelectrodes.The surfaces of the electrodes are revealed by scanning tunneling microscopy (STM), scanning electron microscopy(SEM) and X-ray photoelectron spectrum(XPS) respectively.Cyclic voltammetry and chronoamperometry are employed to characterize the electrodes.Diffusion model of hemicylinder microelectrode is employed to describe the diffusion behavior of ultramicroelec-trode whose band width is as small as 50 nm and the results obtained are satisfactory.Both theory and experimental results show that decrease of the band width has little effect on the faradic current at the ultramicrobandelectrodes, however, the non-faradic current is proportional to the area of those electrodes.So the higher signal to noise ratios are expected to obtained at those electrodes.Potassium fer-rocyanide is detected at 50 nm band ultramicroelectrode with 5.0×10^-7 mol/Ldetective limit.

Key words: Nanometer-sized ultramicroelectrodes, Potassium ferrocyanide, STM, SEM, XPS

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ZHANG Xue-Ji, ZHANG Wu-Ming, ZHOU Xing-Yao, WANG Zu . Investigations on Nanometer-Sized Ultramicroelectrodes(Ⅰ)——Fabrication, Characterization and Application of Ultramicrobandelectrode[J]. Chem. J. Chinese Universities, 1993, 14(7): 927.

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Investigations on Nanometer-Sized Ultramicroelectrodes(Ⅰ)——Fabrication, Characterization and Application of Ultramicrobandelectrode

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