Investigation of SU-8 as protection layer for prism SPR sensor towards reusable honey adulteration detection

• Published in: 2021 IEEE International Conference on Sensors and Nanotechnology (SENNANO) pp. 21 - 24
• Main Authors: Jaafar, M. B., Megat Hasnan, M. M. I., Othman, M. B., Nayan, N., Azman, Z., Yaacob, M., Zin, R. Mohd
• Format: Conference Proceeding
• Language: English
• Published: IEEE 22.09.2021
• Subjects: Conferences; honey adulteration detection; Linear regression; protection layer; Reflectivity; Resists; Sensitivity; Sensors; SU-8 photoresist film; surface plasmons resonance sensor; Water heating
• DOI: 10.1109/SENNANO51750.2021.9642662

This study presents the development of an Ag-based SPR sensor with the presence of SU-8 photoresist film as a protection layer for honey adulteration detection. The pure honey was adulterated by heating process from 30% until 18% water content of adulterated honey. The performance of Cr-Ag-(SU-8) SPR sensor was compared with the Cr-Ag SPR sensor without a protective layer. The resonance angle for these two sensors indicates a similar behavior by shifting to a higher angle than the pure honey. The sensor sensitivity for Cr-Ag and Cr-Ag-(SU-8) is 0.24448°/% which produces a linear regression of more than 96% for honey samples. The resonance angle for Cr-Ag-(SU-8) SPR sensor shows the same values after 24 hours although the reflectance curve is slightly broader. This proved that the SU-8 is capable to protect the Ag surface for repeatable uses. This work is a preliminary study of SU-8 for SPR protection layer to detect the adulteration of honey which based on the percentage of water content.