Sensor and composition

Abstract

A sensor includes a sensor unit that detects a target substance in a liquid; current-voltage control means; and current-voltage measurement means, wherein the sensor unit includes first and second electrodes arranged adjacent to each other with a gap interposed between the first and second electrodes, and a composition disposed between the first and second electrodes and in contact with the first and second electrodes, the current-voltage control means and the current-voltage measurement means are electrically connected to the first and second electrodes, the composition includes a hydrophilic polymer, conductive fine particles, and an enzyme, the conductive fine particles and the enzyme are dispersed in the hydrophilic polymer, a content of the conductive fine particles to a total mass of the composition is a ratio in which the composition is in a percolation state on a mass basis, a product produced by a reaction between the target substance and the enzyme electrochemically interacts with the conductive fine particles, and an electric resistance value of the composition changes.

Dependencies are inferred from the claim text.