A gas sensor, wherein the gas sensor has a measuring channel with a gas inlet and a gas outlet, at least one receptor layer, a reference electrode and an analysis device, • wherein the reference electrode is capacitively coupled with the receptor layer, • wherein the reference electrode is connected in an electively conductive manner to the analysis device, • wherein the receptor layer is formed in the measuring channel, • wherein the measuring channel forms a dielectric layer between the receptor layer and the reference electrode, and • wherein the receptor layer has a support and an analyte-binding layer, • wherein the analyte-binding layer is a self-assembling monolayer which consists of molecules in accordance with the general formula R 1 -R 2 -X, • wherein R 1 is a coupling group, selected from the group containing sulphide, disulphide, sulphinyl, sulphino, sulpho, carbonothiol, thiosulphate, thiocyanate, isothiocyanate, preferably sulphide or thiosulphate, and wherein the molecules of the self-assembling monolayer are each coupled via R 1 to the support; • wherein the support is a layer of metal, wherein the metal is selected from the group containing gold, platinum, palladium, silver and copper; • wherein R 2 is a spacer, selected from the group containing alkane, alkene, alkyne, heteroalkane, heteroalkene, heteroalkyne, substituted alkanes, substituted alkenes, substituted alkynes, substituted heteroalkanes, substituted heteroalkenes, substituted heteroalkynes, ethers, amines; and • wherein X is an organic or organometallic group, which can interact with an analyte molecule, in particular an organic or organometallic group with at least one delocalized π-system, • and wherein the spacers R 2 of adjacent molecules are bound covalently to one another. • wherein the reference electrode is capacitively coupled with the receptor layer, • wherein the reference electrode is connected in an electively conductive manner to the analysis device, • wherein the receptor layer is formed in the measuring channel, • wherein the measuring channel forms a dielectric layer between the receptor layer and the reference electrode, and • wherein the receptor layer has a support and an analyte-binding layer, • wherein the analyte-binding layer is a self-assembling monolayer which consists of molecules in accordance with the general formula R 1 -R 2 -X, • wherein R 1 is a coupling group, selected from the group containing sulphide, disulphide, sulphinyl, sulphino, sulpho, carbonothiol, thiosulphate, thiocyanate, isothiocyanate, preferably sulphide or thiosulphate, and wherein the molecules of the self-assembling monolayer are each coupled via R 1 to the support; • wherein the support is a layer of metal, wherein the metal is selected from the group containing gold, platinum, palladium, silver and copper; • wherein R 2 is a spacer, selected from the group containing alkane, alkene, alkyne, heteroalkane, heteroalkene, heteroalkyne, substituted alkanes, substituted alkenes, substituted alkynes, substituted heteroalkanes, substituted heteroalkenes, substituted heteroalkynes, ethers, amines; and • wherein X is an organic or organometallic group, which can interact with an analyte molecule, in particular an organic or organometallic group with at least one delocalized π-system, • and wherein the spacers R 2 of adjacent molecules are bound covalently to one another.