Title :
Empirical study of noise dependence in electrochemical sensors
Author :
Ghoreishizadeh, Sara S. ; Nanda, Gaurav ; Carrara, Sandro ; De Micheli, G.
Author_Institution :
Lab. of Integrated Syst., Swiss Fed. Inst. of Technol. (EPFL), Lausanne, Switzerland
Abstract :
We report the experimental study of noise in electrochemical biosensors as related to voltage and concentration. A comparison with experiments is performed for H2O2 and Ferrocyanide with bare sensors, and with sensors functionalized with Multi-Walled Carbon Nanotubes (MWCNT) modified electrodes. Chronoamperometry measurements at different voltages were carried out, followed by fast Fourier transform analysis of noise at different concentration of analyte to understand the effect of concentration and voltage on the noise Power Spectral Density (PSD) and the Signal over Noise (SNR) ratio. Experimental results demonstrate the presence of 1/f noise and its dependence on the state variables. The parameters of 1/f noise i.e. the amplitude coefficient and frequency power coefficients are extracted by curve fitting, and are characterized by comparing the coefficient in different molecules, electrodes, voltages and concentration.
Keywords :
1/f noise; biosensors; carbon nanotubes; chemical sensors; electrochemical electrodes; fast Fourier transforms; 1/f noise; C; H2O2; MWCNT modified electrodes; PSD; SNR; bare sensors; chronoamperometry measurements; curve fitting; electrochemical biosensors; fast Fourier transform analysis; ferrocyanide; multiwalled carbon nanotubes modified electrodes; noise dependence; power spectral density; signal over noise ratio; Biosensors; Electrodes; Graphite; Noise measurement; Signal to noise ratio; Voltage measurement; Ferrocyanide; H2O2; MWCNT; SNR; chronoamperometry; flicker noise; voltage and concentration effect;
Conference_Titel :
Advances in Sensors and Interfaces (IWASI), 2013 5th IEEE International Workshop on
Conference_Location :
Bari
Print_ISBN :
978-1-4799-0039-8
DOI :
10.1109/IWASI.2013.6576080
