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Open AccessArticle

Detection of Hydrofluoric Acid by a SiO2 Sol-Gel Coating Fiber-Optic Probe Based on Reflection-Based Localized Surface Plasmon Resonance

1
Micro Systems Technology Center, ITRI South, Industrial Technology Research Institute, Tainan 709, Taiwan
2
College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
3
Chemical Engineering Department, National Chung-Cheng University, Chia-Yi, 621, Taiwan
*
Author to whom correspondence should be addressed.
Sensors 2011, 11(2), 1907-1923; https://doi.org/10.3390/s110201907
Received: 7 January 2011 / Revised: 18 January 2011 / Accepted: 26 January 2011 / Published: 1 February 2011
(This article belongs to the Section Chemical Sensors)
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 SiO2 sol-gel coating. This fiber-sensor was utilized to assess the relationship between HF concentration and SiO2 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. View Full-Text
Keywords: surface plasmon resonance; hydrofluoric acid; optical fiber; sol-gel; SiO2 surface plasmon resonance; hydrofluoric acid; optical fiber; sol-gel; SiO2
MDPI and ACS Style

Chen, I.-C.; Lin, S.-S.; Lin, T.-J.; Du, J.-K. Detection of Hydrofluoric Acid by a SiO2 Sol-Gel Coating Fiber-Optic Probe Based on Reflection-Based Localized Surface Plasmon Resonance. Sensors 2011, 11, 1907-1923.

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