Title :
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
fDate :
Aug. 30 2006-Sept. 3 2006
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/falpha 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/falpha 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;
Conference_Titel :
Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE
Conference_Location :
New York, NY
Print_ISBN :
1-4244-0032-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2006.260406
