Abstract: A biosensor includes a sensor element and probe molecules immobilized on a surface of the sensor element. The probe molecules are modified with a labeling substance to estimate an amount of the immobilized probe molecules on the sensor element.

Abstract: A biosensor is a field-effect transistor-based biosensor including an insulating substrate, and a measurement sensor and a reference sensor on the insulating substrate. A probe molecule is in the measurement sensor. The probe molecule has a first basic moiety in the measurement sensor, and a recognition moiety with a first end bound to the first basic moiety and a second end defining a distal end of the probe molecule. A second basic moiety is in the reference sensor and has a same structure as that of the first basic moiety of the probe molecule in the measurement sensor. The recognition moiety of the probe molecule in the measurement sensor is absent at the distal end of the second basic moiety.

Abstract: A field effect transistor includes a substrate, a material layer on a surface of the substrate and including a two-dimensional material or carbon nanotubes, and particles interposed between the substrate and the material layer.

Abstract: A semiconductor sensor includes an insulating substrate, a semiconductor sheet on the insulating substrate and including graphene or carbon nanotubes, a source electrode and a drain electrode, each being provided on the insulating substrate and electrically coupled to the semiconductor sheet, an oxide film extending over a surface of the semiconductor sheet and including silica, alumina, or a composite oxide of silica and alumina, and a receptor at a surface of the oxide film.

Abstract: A semiconductor sensor includes a substrate, a dielectric layer on the substrate, a first electrode on the dielectric layer, and a second electrode spaced apart from the first electrode and on the dielectric layer, a semiconductor sheet between the first electrode and the second electrode on the dielectric layer and electrically connecting the first electrode and the second electrode to each other, a third electrode at least a portion of which is covered by the dielectric layer and faces the semiconductor sheet with the dielectric layer interposed therebetween, and multiple first attraction portions at least on a surface of the third electrode or in or on the dielectric layer on the surface of the third electrode and attracting an object to be detected.

Abstract: A semiconductor device according to the present invention includes a substrate, a plurality of electrodes on the substrate, an insulator provided with one or a plurality of openings exposing at least one electrode among the plurality of electrodes on the substrate, the insulator covering at least a portion of the plurality of electrodes, and a semiconductor sheet on the insulator and one or a plurality of exposed portions exposed from the one or the plurality of openings on the substrate.

Abstract: A detector detects a target using a sensor and includes a measurement circuit to measure a signal from the sensor and a computation circuit to separate a signal measured by the measurement circuit into a variation component of the sensor and a response component of the sensor. The computation circuit performs analysis using a state space model including a state equation specified by time-series information of the variation component of the sensor and an observation equation specified by separation between the variation component of the sensor and the response component of the sensor.

Abstract: A graphene transistor includes a graphene layer including at least one sheet of graphene, a drain electrode and a source electrode each electrically connected to the graphene layer, a charge donor on at least one main surface of the graphene layer, the charge donor including an impurity charge, and a counter ion having a charge with a sign different from a sign of the impurity charge.

Abstract: A virus detection system is provided for receiving electrical signals that change quantitatively based on an amount of virus, via a communication line, from a measuring device equipped with graphene sensors that output the electrical signals that change quantitatively based on the amount of virus contained in samples collected from subjects and that associate the electrical signals with identification information for each subject. The virus detection further analyzes the amount of the virus contained in the samples collected from each of the subjects based on changes in the electrical signals outputted from the graphene sensors; and sends, via the communication line, analysis results on the amount of virus contained in the samples collected from each of the subjects to the communication terminal pre-registered to each subject.