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Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement

The tapered optical fiber (TOF) sensor based on localized surface plasmon resonance (LSPR) was experimentally demonstrated for determination of surrounding liquid refractive index (RI) changes. The reduction of tapered waist diameter was done by flame-brushing method which results in the diameter ra...

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Main Author: Musa, Nurfatin
Format: Thesis
Language:English
Published: 2020
Subjects:
Q Science (General)
Online Access:http://eprints.utm.my/id/eprint/102255/1/NurfatinMusaMFS2020.pdf.pdf
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spelling my.utm.1022552023-08-13T06:16:00Z http://eprints.utm.my/id/eprint/102255/ Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement Musa, Nurfatin Q Science (General) The tapered optical fiber (TOF) sensor based on localized surface plasmon resonance (LSPR) was experimentally demonstrated for determination of surrounding liquid refractive index (RI) changes. The reduction of tapered waist diameter was done by flame-brushing method which results in the diameter range of 6 μm to 18 μm. The sensing mechanism is based on the transmission shift in the monitored output spectra. Key parameter optimization of the TOF sensor has been investigated particularly on the coating time of gold nanoparticles (AuNPs) onto fiber substrate. Functionalization of AuNPs by self-assemble monolayer was carried out through dip coating technique. Five different coating periods of 24, 48, 72, 96 and 120 hours have been performed on the TOF and characterized by using field emission scanning electron microscopy (FESEM). Histogram analysis was extracted from the FESEM images in order to determine the average particle’s size while the coating thickness were measured based on the cross-section image analysis. The highest sensitivity of the sensor was recorded at 18.49314 nm/RI corresponding to 48 hours of coating time. The optimum thickness of coating layer was calculated around 53.11 nm along the average particle’s size of 15 nm. Energy dispersive X-ray (EDX) characterization shows 22.4% of gold element on deposited fiber surface which proved the existence of the gold on the tapered structure. The optimized sensor was further examined for its overall performance in terms of stability, reversibility and repeatability over RI range from 1.3324 to 1.4254. Stability test of the TOF sensor suggests that the output signals are stable at low and medium of RI but a little variation on highest RI was recorded around ±0.00594 a.u. For the reversibility check, the TOF sensor acquired good response with little variation of ±0.008 a.u. between ascending and descending measurement order. 2020 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/102255/1/NurfatinMusaMFS2020.pdf.pdf Musa, Nurfatin (2020) Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement. Masters thesis, Universiti Teknologi Malaysia. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:146314
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic Q Science (General)
spellingShingle Q Science (General)
Musa, Nurfatin
Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement
description The tapered optical fiber (TOF) sensor based on localized surface plasmon resonance (LSPR) was experimentally demonstrated for determination of surrounding liquid refractive index (RI) changes. The reduction of tapered waist diameter was done by flame-brushing method which results in the diameter range of 6 μm to 18 μm. The sensing mechanism is based on the transmission shift in the monitored output spectra. Key parameter optimization of the TOF sensor has been investigated particularly on the coating time of gold nanoparticles (AuNPs) onto fiber substrate. Functionalization of AuNPs by self-assemble monolayer was carried out through dip coating technique. Five different coating periods of 24, 48, 72, 96 and 120 hours have been performed on the TOF and characterized by using field emission scanning electron microscopy (FESEM). Histogram analysis was extracted from the FESEM images in order to determine the average particle’s size while the coating thickness were measured based on the cross-section image analysis. The highest sensitivity of the sensor was recorded at 18.49314 nm/RI corresponding to 48 hours of coating time. The optimum thickness of coating layer was calculated around 53.11 nm along the average particle’s size of 15 nm. Energy dispersive X-ray (EDX) characterization shows 22.4% of gold element on deposited fiber surface which proved the existence of the gold on the tapered structure. The optimized sensor was further examined for its overall performance in terms of stability, reversibility and repeatability over RI range from 1.3324 to 1.4254. Stability test of the TOF sensor suggests that the output signals are stable at low and medium of RI but a little variation on highest RI was recorded around ±0.00594 a.u. For the reversibility check, the TOF sensor acquired good response with little variation of ±0.008 a.u. between ascending and descending measurement order.
format Thesis
author Musa, Nurfatin
author_facet Musa, Nurfatin
author_sort Musa, Nurfatin
title Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement
title_short Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement
title_full Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement
title_fullStr Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement
title_full_unstemmed Localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement
title_sort localized surface plasmon resonance sensor based on gold-coated tapered optical fiber for refractive index measurement
publishDate 2020
url http://eprints.utm.my/id/eprint/102255/1/NurfatinMusaMFS2020.pdf.pdf
http://eprints.utm.my/id/eprint/102255/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:146314
_version_ 1775621960500248576
score 13.211869

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