FABRICATION OF FIBER OPTIC BASED SPR SENSOR USING AG/AU BIMETALLIC THIN FILMS FOR GLYCERIN DETECTION

• Main Author: Gemilang, Briana
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/78103
• Institution: Institut Teknologi Bandung

Optical biosensors offer significant benefits over conventional analytical techniques due to their advantages in detecting in real time and label-free for a wide range of chemical and biological substances. Surface Plasmon Resonance (SPR) based sensors have received particular attention in their development. SPR sensors are susceptible to changes in the refractive index at the interface between the metal layer and the dielectric medium. One type of SPR sensor that has recently been developed is an optical fiber-based SPR sensor. Compared to conventional SPR sensors, fiber-optic-based SPR sensors offer the advantages of being cost- effective and more straightforward structure. To obtain optimal fiber-optic-based SPR sensor parameters and improve sensor performance, the effect of metal film material and metal film thickness on the spectral characteristics of the sensor was studied. In this study, a fiber-optic-based SPR sensor was developed to detect glycerin concentration as a solution with different refractive index. Ag/Au nanomaterial is used as a recognition element in detecting glycerin with a thickness of Ag 31.8 nm and Au 21.2 nm. The characteristics of the sensing area were analyzed using a Scanning Electron Microscope with Energy Dispersive X-Ray (SEM-EDX) and UV- Vis Spectroscopy. By monitoring changes in the peak wavelength of the SPR resonance, the performance parameters of fiber-optic-based SPR sensors were obtained, and the sensor’s sensitivity is 0.2489 ± 0.011 nm/mM in the concentration range of 0.05-0.48 mM. This sensor has the advantages of simple structure and low cost, so it has good prospects in the field of biochemical sensing.