▎ 摘　　要

NOVELTY - A field-effect tube micro-sensor comprises field-effect transistor (FET) microelectrode, graphene layers and ion-imprinted polymer layers sequentially stacked from bottom to top. The FET microelectrode comprises substrate and interdigital electrode layer on surface of the substrate, and channel formed between interdigital electrode layer and substrate. The graphene layer and ion-imprinted polymer layer are located at the channel. The ion-imprinted polymer layer and the graphene layer are connected in crosslinked form. The ion-imprinted polymer in the ion-imprinted polymer layer is obtained by polymerizing polyetherimide and acrylic acid as monomers and cadmium (II) ion as template ions under ultraviolet light irradiation, and then removing the template ions. USE - Field-effect tube micro-sensor for detecting divalent cadmium ions in water (claimed). ADVANTAGE - The field-effect tube micro-sensor has improved detection sensitivity and recognition ability to divalent cadmium ions, and prolonged service life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of the field-effect tube micro-sensor, which involves using graphene oxide, polyetherimide, acrylic acid and divalent cadmium salt, and intermediate polymer.