Analyte detector for detecting at least one analyte in at least one fluid sample

1. An analyte detector for detecting at least one analyte in at least one fluid sample, the analyte detector comprising:

at least one multipurpose electrode exposable to the fluid sample,

at least one field-effect transistor in electrical contact with the multipurpose electrode, and

at least one electrochemical measurement device in electrical contact with the multipurpose electrode,

wherein the electrochemical measurement device is configured for performing at least one electrochemical measurement using the multipurpose electrode, and wherein the field-effect transistor is configured for performing at least one transistor measurement using the multipurpose electrode,

wherein the analyte detector further comprises at least one controller, wherein the controller is connected to the field-effect transistor and to the electrochemical measurement device and wherein the controller is configured for controlling the at least one transistor measurement by using the field-effect transistor and wherein the controller additionally is configured for controlling the at least one electrochemical measurement by using the electrochemical measurement device.

2. The analyte detector according to claim 1 , wherein the controller is configured for controlling the at least one transistor measurement by measuring a drain current of the field-effect transistor.

3. The analyte detector according to claim 1 , wherein the controller is configured for sequentially triggering at least one measurement using the field-effect transistor and the at least one electrochemical measurement.

4. The analyte detector according to claim 3 , wherein the controller is configured for repeatedly performing a sequence of the at least one measurement using the field-effect transistor and the at least one electrochemical measurement.

5. The analyte detector according to claim 1 , wherein the multipurpose electrode is in electrical contact with a gate electrode of the field-effect transistor.

6. The analyte detector according to claim 1 , wherein the multipurpose electrode is at least partially identical with at least one element selected from the group consisting of the gate electrode of the field-effect transistor and a channel of the field-effect transistor.

7. The analyte detector according to claim 1 , wherein the analyte detector comprises at least one graphene layer interconnecting at least two electrically conductive electrodes, wherein the graphene layer is accessible to the analyte, wherein the multipurpose electrode comprises at least one element of the group consisting of: at least one of the at least two electrically conductive electrodes, the graphene layer.

8. The analyte detector according to claim 1 , wherein the at least one multipurpose electrode is in electrical contact with one or both of a source electrode or a drain electrode of the field-effect transistor.

9. The analyte detector according to claim 1 , wherein the analyte detector comprises at least one further electrode exposable to the fluid sample, the at least one further electrode comprising at least one electrode selected from the group consisting of a counter electrode and a reference electrode, wherein the electrochemical measurement device is configured for performing the at least one electrochemical measurement using the multipurpose electrode and the further electrode.

10. The analyte detector according to claim 1 , wherein the multipurpose electrode comprises at least one functional component exposed to its surface, wherein the at least one functional component is configured for interacting with the analyte.

11. The analyte detector according to claim 10 , wherein the functional component comprises at least one receptor compound, the receptor compound being capable of binding the at least one analyte.

12. The analyte detector according to claim 11 , wherein the receptor compound is capable of binding the at least one analyte is selected from the group consisting of: antibodies and fragments thereof, aptamers, peptides, enzymes, nucleic acids, receptor proteins or binding domains thereof and hydrophilic polymers capable of mediating a salting-out effect.

13. The analyte detector according to claim 1 , wherein the electrochemical measurement device is configured for performing at least one electrochemical measurement selected from the group consisting of: a cyclic voltammetry measurement; an impedance measurement; a potentiostatic measurement; an amperometric measurement; electrochemical impedance spectroscopy; voltammetry; amperometry; potentiometry; coulometry.

14. The analyte detector according to claim 1 , wherein the analyte detector further comprises at least one fluid channel, wherein the at least one multipurpose electrode is disposed to be in contact with the fluid sample within the fluid channel.

15. The analyte detector according to claim 1 , wherein the at least one field-effect transistor is selected from the group consisting of: an ion-sensitive field-effect transistor (ISFET); a chemically sensitive field-effect transistor (ChemFET); a biological field-effect transistor (BioFET); an enzyme field-effect transistor (ENFET); an extended-gate field-effect transistor (EGFET); a solution- or liquid-gated FET.

16. A method for detecting at least one analyte in at least one fluid sample, the method using the analyte detector according to claim 1 , the method comprising the following steps:

a) providing at least one multipurpose electrode;

b) providing the at least one fluid sample in contact with the multipurpose electrode;

c) performing at least one transistor measurement by using at least one field-effect transistor in electrical contact with the at least one multipurpose electrode; and

d) performing at least one electrochemical measurement by using the multipurpose electrode.

17. The method according to claim 16 , wherein in method step c) at least one transistor measurement value is generated, wherein in method step d) at least one electrochemical measurement value is generated, wherein the transistor measurement value and electrochemical measurement value are combined for one or both of quantitatively or qualitatively detecting the at least one analyte in the fluid sample.

18. The analyte detector according to claim 1 , wherein the at least one multipurpose electrode is at least partially covered by a membrane which is permeable by the analyte.