Detection of hydrofluoric acid by a SiO2 sol-gel coating fiber-optic probe based on reflection-based localized surface plasmon resonance.
A novel fiber-optic probe based on reflection-based localized surface plasmon resonance (LSPR) was developed to quantify the concentration of hydrofluoric acid (HF) in aqueous solutions. The LSPR sensor was constructed with a gold nanoparticle-modified PMMA fiber, integrated with a SiO(2) sol-gel coating. This fiber-sensor was utilized to assess the relationship between HF concentration and SiO(2) sol-gel layer etching reduction. The results demonstrated the LSPR sensor was capable of detecting HF-related erosion of hydrofluoric acid solutions of concentrations ranging from 1% to 5% using Relative RI Change Rates. The development of the LSPR sensor constitutes the basis of a detector with significant sensitivity for practical use in monitoring HF solution concentrations.
Micro Systems Technology Center, ITRI South, Industrial Technology Research Institute, Tainan 709, Taiwan. Eugenechen@itri.org.tw
I-Cherng
IC
Chen
Shiu-Shiung
SS
Lin
Tsao-Jen
TJ
Lin
Je-Kang
JK
Du
D006046:Gold / Q000737:chemistry; D006858:Hydrofluoric Acid / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry; D009716:Numerical Analysis, Computer-Assisted; D055100:Optical Fibers; D055620:Optical Phenomena; D017646:Organosilicon Compounds / Q000737:chemistry; D044367:Phase Transition; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012031:Refractometry; D012815:Signal Processing, Computer-Assisted; D012822:Silicon Dioxide / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
D017646:Organosilicon Compounds; C500739:tetramethyl orthosilicate; D006046:Gold; D012822:Silicon Dioxide; D019904:Polymethyl Methacrylate; D006858:Hydrofluoric Acid