An Amperometric Sensor for Sulfide Detection Based on Carbon Nanotubes

Abstract Carbon nanotubes, with their unique combination of electrical, optical, mechanical, and electrochemical properties, have attracted considerable attention for sensor applications. In this work, an amperometric sensor was constructed using single-walled carbon nanotubes and conducting polymer for the detection of sulfide. The polymer functionalized carbon nanotubes provided an excellent sensing platform with a large active surface area and enhanced electron-transfer properties, which confers high sensitivity. Electrochemical impedance spectroscopy investigation has shown that the excellent performances of the sensor can be attributed to the formation of a network of highly conductive carbon nanotubes well-dispersed in the polymer matrix. The carbon nanotube contents and operation potential of the sensor were optimized to achieve a high sensitivity.