Devices and methods for selective detection of cannabinoids

A device for detecting at least one substance in a sample, the device comprising:

• an electrochemical sensor comprising;
• a gate layer;
• a dielectric layer;
• a source electrode, a drain electrode and an organic semiconducting layer, wherein the organic semiconductor layer is provided between the source electrode and the drain electrode for providing a current pathway therebetween;
• wherein the organic semiconducting layer is modified with a probe, said probe being a sensitizing agent, such that said organic semiconducting layer is sensitized to cannabinoids in said sample, and wherein said organic semiconductor layer comprises at least one of:
• CuPc, F16CuPc, FePc, AlClPc, ts-CuPc, H2Pc, CoPc, or tbt-CuPc;
• a voltage source electrically coupled to the gate layer and the source electrode;
• and
• processing means for measuring current flow and detecting a current level indicative of a presence of said substance and/or levels thereof in the sample,
• wherein said substance is a cannabinoid,
• wherein said probe comprises an alkaline solution of a diazonium salt,
• wherein interactions between said organic semiconducting layer, said probe, and said substance in said sample affects at least one electrochemical property of said organic semiconducting layer,
• and wherein said source electrode, said drain electrode, and said organic semiconducting layer form an OFET circuit formed within an integrated circuit.

A method for determining a presence of a cannabinoid in a sample, the method comprising:

• a) contacting said sample with a sensor element;
• b) measuring an analog signal, said analog signal being indicative of one or more electrochemical properties of said sensor element;
• c) determining that at least one cannabinoid is present in said sample if said analog signal indicates a change in said electrochemical properties of said sensor element;
• wherein said sensor element is treated with a probe layer prior to step a) to thereby sensitize said sensor element to cannabinoids in said sample;
• wherein said probe layer comprises an alkaline solution of a diazonium salt;
• wherein, when said cannabinoid is in contact with said sensor element, said electrochemical properties of said sensor element are affected by interactions between said cannabinoid, said probe, and said sensor element, and wherein said sensor element comprises at least one of:
• CuPc, F16CuPc, FePc, AICIPc, ts-CuPc, H2Pc, CoPc, or tbt-CuPc.