Using impedance porous GaAs-based for biomedical gas sensor

Porous GaAs was formed electrochemically on n-type GaAs in a HF:C2H5OH (1:3) electrolyte. The surface morphology of porous GaAs has been studied using interference microscope image and scanning electron microscope (SEM). The hodographs of the total impedance and the adsorption influence of ethanol and acetone vapor on the charge transfer were examined. The use of the impedance spectroscopy of porous GaAs for the detection of different gases was proposed.