The present patent describes a wire-free chemical sensor based on LC resonators formed by inductors connected to EIS (Electrolyte-Insulator-Semiconductor) capacitors - which are pH-sensitive - and EMIS (Electrolyte-Membrane-Insulator-Semiconductor) capacitors - which are sensitive to other chemical species in solution. The electrical connection to the solution (and to the membrane) is achieved by means of two electrodes, one being a reference electrode for obtaining a stable DC potential and the other being of low impedance for obtaining a high resonator quality factor. An external inductor coupled magnetically to the resonator's inductor is used to measure the resonant frequency remotely. The advantages offered by this wire-free chemical sensor are its simplicity, low cost, response speed and the non-toxic nature of the materials (it does not use batteries).