Vol. 122, Issue 11, November 2010, pp.72-84

Excess Noises in (Bio-)Chemical Nanoscale Sensors

Ferdinand GASPARYAN

Department of Physics of Semiconductors & Microelectronics

Yerevan State University,

1 Alex Manoogian St., 0025 Yerevan, Armenia

Tel.: (37410) 57 83 82

E-mail: fgaspar@ysu.am

Received: 16 July 2010   /Accepted: 18 November 2010   /Published: 30 November 2010

Abstract: Brief overview of the basic tendencies of development of nanoscale (bio-) chemical sensors is presented. Last years’ experimental data and theoretical models for of low frequency excess noises are summarized and analyzed; in particularly works in the field of sensors functionalized by the nanoparticles, nanotubes and nanowires is discussed. Nanoscale field-effect transistors, electrolyte-gate field-effect devices and capacitive electrolyte-insulator-semiconductor structures were discussed. Single- and multi-walled and other material’s based nanotubes and nanowires were reviewed. Main mechanism of excess noises formation, behavior and peculiarities of the noise spectral density, and the Hooge parameter were analyzed. Role of the functionalization (with several nanoparticles, nanotubes and nanowires) on the essential reduction of 1/f-noise level is discussed.

Keywords: Low frequency noises, Sensors, Field-effect devices

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