Impedance spectroscopy of single graphene layer at gas adsorption

Abstract

Impedance spectroscopy and micro‐Raman spectroscopy were applied for analysis of single graphene layer. Despite that Raman spectra showed the high quality of studied layers (ratio of intensities of the D and G peaks ID/IG is better than <0.01), two semicircles on the Nyquist curve of the Ni–graphene–Ni structure suggest the existence of inhomogeneous regions. Exposure in ethanol and acetone vapors by different degrees affects the reactive and active resistance of graphene film. Moreover, the dynamic response behavior of impedance differs in the vapor of ethanol, acetone, and phenol. It ensures that impedance spectroscopy of graphene is a useful tool for detection of different gases.

On Some Important Results in Semiconductor Surface Science Obtained in Ukraine during the Independence Years (1991-2016)

“…The influence of nanoparticles of noble metals on the electric properties of nano-porous silicon was studied [22,23]. New types of effective chemical sensors were developed for detecting hydrogen, moisture, hydrogen-carbon compounds, heavy metals, and organic media, in which the luminescent or electric transducers on the basis of surface-barrier structures from porous silicon, titanium oxide, graphene, and other nanosubstances were applied [24][25][26][27]. The influence of surface states on the kinetics and the sensitivity of chemical sensors on the basis of Schottky structures was established [28].…”