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

Sensors

I-Cherng Chen²  Shiu-Shiung Lin¹  Tsao-Jen Lin³ 

[1] College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan;E-Mails:;Micro Systems Technology Center, ITRI South, Industrial Technology Research Institute, Tainan 709, Taiwan; E-Mail:;Chemical Engineering Department, National Chung-Cheng University, Chia-Yi, 621, Taiwan

关键词: surface plasmon resonance;    hydrofluoric acid;    optical fiber;    sol-gel;    SiO₂;   

DOI  :  10.3390/s110201907

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.