Characterization of gold electrodes in phosphate buffered saline solution by impedance and noise measurements for biological applications

Author

McAdams, E.T. ; Jossinet, J. ; Subramanian, R. ; McCauley, R.G.E.

Author_Institution

NIBEC, Ulster Univ., Jordanstown

fYear

2006

fDate

Aug. 30 2006-Sept. 3 2006

Firstpage

4594

Lastpage

4597

Abstract

Impedance spectroscopy and noise measurements have been used to study gold electrodes of three different surface areas in phosphate buffered saline (PBS) solution. The gold-PBS solution interface can be modeled by a charge transfer resistance in parallel with an interfacial constant phase element (CPE) which are in series with the solution resistance. The voltage noise fluctuations were analyzed using the fast Fourier transform (FFT) method. It is found that the voltage noise power is characterized by a 1/f^alpha spectrum in the low frequency range. The value of alpha is observed to be double that of the CPE coefficient beta. The authors suggest a link between the interface impedance and the measured noise

Keywords

1/f noise; biomedical electrodes; biomedical measurement; charge exchange; electric impedance; electrochemical electrodes; fast Fourier transforms; fluctuations; gold; surface chemistry; thermal noise; 1/f^alpha spectrum; Au; biomedical measurement; charge transfer resistance; fast Fourier transform method; gold electrodes; impedance spectroscopy; interfacial constant phase element coefficient; noise measurements; phosphate buffered saline solution; surface areas; voltage noise fluctuations; voltage noise power; Biological system modeling; Charge transfer; Electrochemical impedance spectroscopy; Electrodes; Gold; Immune system; Low-frequency noise; Noise measurement; Surface impedance; Surface resistance;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE

Conference_Location

New York, NY

ISSN

1557-170X

Print_ISBN

1-4244-0032-5

Electronic_ISBN

1557-170X

Type

conf

DOI

10.1109/IEMBS.2006.260406

Filename

4462825