Impedance spectroscopy of single graphene layer at gas adsorption

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.