PENGEMBANGAN SENSOR UAP AMONIA BERBASIS SERAT OPTIK DENGAN CLADDING TERMODIFIKASI NANOSERAT POLIANILIN

Abstract

It has been developed a fiber optic sensor system for detection of ammonia vapors. The designed system, a signal
transduction mechanism was based on the change in the evanescent wave absorption on core-modified cladding
interface when exposed with ammonia vapors. In this research, used polyaniline nanofiber synthesized by interfacial
polymerization as a modified cladding of fiber optic. The spectroscopy result shows a specific absorbance spectrum of
polyaniline nanofiber shifts to shorter wavelength when exposed with ammonia vapor due to the change of polyaniline
color from green to blue-purple. The response of fiber optic sensor was investigated by measuring the transmission
intensity of light beam through the fiber optic sensor system. It is obtained a fast response with a response time of 30
seconds and recovery time is about 30 seconds. The sensor also exhibits a good reversibility and repeatability.
Keywords: fiber optic sensor, evanescent wave, polyaniline nanofiber, ammonia vapors.