Abstract
Low frequency noise’s investigation in (bio-)chemical sensors on the base of electrolyte-gate field-effect devices, such as capacitive electrolyte-insulator-semiconductor (EIS) structures functionalized with single-walled carbon nanotubes (SWCNT) were carried out. At frequencies below 10 Hz, noise-reduction effect has been revealed in a functionalized EIS structure. This effect depends on the applied gate voltage and is stronger in the depletion regime. The presence of an additional SWCNT multilayer leads to essential reduction (by the factor of up to 100) of the 1/f-noise in comparison to bare EIS structure. A modified charge fluctuation noise model is developed. The model is successfully used for the explanation of noise peculiarities of p-Si/SiO2/Ta2O5/electrolyte and p-Si/SiO2/Ta2O5/dendrimer/SWCNT/electrolyte bio-chemical sensors. The results of noise spectra investigation should be taken into account for sensitivity enhancement of capacitive EIS biosensors, especially to improve the lower detection limit.
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Gasparyan, F.V. (2013). Noise Reduction in (Bio-) Chemical Sensors Functionalized with Carbon Nanotube Multilayers. In: Vaseashta, A., Khudaverdyan, S. (eds) Advanced Sensors for Safety and Security. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7003-4_11
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