Plastic Optical Fiber pH Sensor Based on Sol-Gel Film
DOI:
https://doi.org/10.11113/jomalisc.v1.15Keywords:
Fiber-optic sensor, pH sensor, sol–gel, plastic optical fiberAbstract
A plastic optical fiber (POF) pH sensor is developed based on a sol-gel film. A sol-gel film was prepared by mixing tetramethyl orthosilicate (TMOS), trimethoxymethylsilane (MTMS), ethanol, distilled water and Neutral Red (NR) powder. Then, plastic optical fiber is coated by manually depositing the sol-gel film onto the tip of the POF. The sensing probe is dissolved into analytes with different pH levels, such as Coca-Cola (pH 3), tomato sauce (pH 4), black coffee (pH 5), tea (pH 6), distilled water (pH 7), soap (pH 8), baking soda (pH 9) and Clorox bleach(pH 10). The Refractive index will increase when the analytes are more acidic or more alkaline because they are concentrated with hydrogen and hydroxide ions at pH 3 and pH 10. The output power is varied based on the chemical reaction with the pH sol-gel film in the fiber-optic sensing probe. From the experimental results, it is concluded that the sensitivity of coated POF sensor, which is 0.0566 a.u/RIU, is higher than the sensitivity of the uncoated POF, which is 0.0429 a.u/RIU.
References
Bilro, L., Alberto, N., Pinto, J. L., & Nogueira, R. (2012). Optical sensors based on plastic fibers. Sensors (Switzerland), 12(9), 12184–12207.
Chauhan, R., Singh, H. S., & Shekhawat, R. (2016). The formulation between penetration depth and critical temperature of superconductors by thermal physics and electromagnetic theory. International Journal of Advanced Research, 4(10), 134–137.
Cennamo, N., Massarotti, D., Conte, L., & Zeni, L. (2011). Low cost sensors based on SPR in a plastic optical fiber forbiosensor implementation. Sensors, 11(12), 11752–11760.
Jeon, D., Yoo, W. J., Seo, J. K., Shin, S. H., Han, K. T., Kim, S. G. et al. (2013). Fiber-optic pH sensor based on sol-gel film immobilized with neutral red. Optical Review, 20(2), 209–213.
Islam, S., Bidin, N., Riaz, S., Krishnan, G., & Naseem, S. (2016). Sol-gel based fiber optic pH nanosensor: Structural and sensing properties’, Sensors and Actuators, A: Physical, vol. 238, pp. 8–18.
Khan, A. S., Khalid, H., Sarfraz, Z., Khan, M., Iqbal, J., Muhammad, N. et al. (2017). Vibrational spectroscopy of selective dental restorative materials. Applied Spectroscopy Reviews, 52(6), 507–540.
Kulkarni, V. S., & Shaw, C. (2016). Miscellaneous Physical, Chemical, and Microbiological Test Methods. Essential Chemistry for Formulators of Semisolid and Liquid Dosages, 193–221.
Pollock, C. R. (1995). Fundamentals of optoelectronics, Richard d Irwin, Burr Ridge II.
Rashid, A. R. A, Shamsuri, N. A. F. et al. (2019). Zinc oxide coated polymer optical fiber for measuring uric acid concentrations. Optoelectronics and Advanced Materials- Rapid Communications, 12(1-2), 63-68.
Rashid, A. R. A., Nasution, A. A., Suranin, A. H., Taib, N. A., Mukhtar, W. M., Dasuki, K. A., & Ehsan, A. A. (2017). Chemical tapering of polymer optical fiber. In EPJ Web of Conferences (Vol. 162, p. 01015).
Rovati, L., Fabbri, P., Ferrari, L., & Pilati, F. (2012). Plastic optical fiber pH sensor using a sol-gel sensing matrix. In Fiber Optic Sensors (pp. 415- 439).
Shaari, S., Rashid, A.R.A, Menon, P. S., Arshad, N. (2013). Al doped ZnO coated fiber optic for ultraviolet and acetone sensing. Advanced Science Letters, 19(5), 1306-1309.
Singh, S. (2002). Refractive index measurement and its applications. Physica Scripta, 65(2), 167–180.
Zhang, J., Ramana, P. V., Chandrappan, J., Tan, C. W., Chai, Y. Y., Khoo, Y. M., … Ramkumar, V. M. (2010). Development of optical subassembly for plastic optical fiber transceiver in high-speed applications. IEEE Transactions on Advanced Packaging, 33(2), 428–432.
