Development of a Taste Sensor Based on a Carbon Nanotube-Polymer Composite Material

A taste sensor consisting of a back-gate type field effect transistor (FET) chip based on carbon nanotube compound materials [poly(ethylene glycol) (PEG)-grafted single-walled carbon nanotubes (PEG-SWNTs)] was developed. The results of impedance measurements for five tastes (sourness, saltiness, bitterness, sweetness, and umami), are shown much difference for specific tastes which are difficult to identify by using Langmuir–Blodgett (LB) film. Moreover, the sensor is able to distinguish most of the experimental taste materials with a short response time (~60 s).