Fabrication of silver nanoparticiles on cylindrical surface of U-shaped fiber ATR sensor by material reduction

An implantable U-shaped fiber ATR (attenuated total reflection) sensor enhanced by silver nanoparticles (AgNPs) on cylindrical surface was presented for continuous glucose monitoring. U-shaped structure was addressed to increase effective optical length at limited implantable space to enhance the sensitivity of fiber ATR sensor. A novel method to fabricate silver nanoparticles on cylindrical surface of U-shaped fiber ATR sensor based on chemical reduction of its silver halide material directly without any preliminary nanoparticles synthesis and the following covalent bond or self-assembly was proposed. The silver nanoparticles will further enhance infrared absorption signal of fiber ATR sensor. The experiment result shows that the sensitivity of enhanced fiber ATR sensor enhanced by the silver nanoparticles is about three times than the normal one.