Surface plasmon resonance (SPR) based sensors using Ag thin films
have been successfully applied for detection of nitrogen dioxide (NO2) gas. The
SPR sensors have Cobalt Phthalocyanine (Co-Pc) as active add layer. Surface
plasmon was generated via a prism coupler in Kretschmann configuration. It is
found that the sensitivity of SPR sensor is 0.14 ppm in ambient environment at
NTP. The simple structure of the SPR sensor makes it superior to liquid
chemical sensors for the detection of NO2.