Fiber optic based sensor for Ni2+.
This study aimed to combine the use of a Mach-Zehnder type interferometer and the hydrogel volume phase transition theory to quantitatively model the refractive index dependence upon Ni2+ concentration. A highly sensitive refractive index sensor was achieved via fusion splicing, sandwiching a 3 cm p...
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| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2013
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| Online Access: | http://hdl.handle.net/10356/53696 |
| _version_ | 1826129778175901696 |
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| author | Hong, Jesmond Xun Jie. |
| author2 | Chan Chi Chiu |
| author_facet | Chan Chi Chiu Hong, Jesmond Xun Jie. |
| author_sort | Hong, Jesmond Xun Jie. |
| collection | NTU |
| description | This study aimed to combine the use of a Mach-Zehnder type interferometer and the hydrogel volume phase transition theory to quantitatively model the refractive index dependence upon Ni2+ concentration. A highly sensitive refractive index sensor was achieved via fusion splicing, sandwiching a 3 cm photonic crystal fiber (PCF) longitudinally in the middle of two SMFs. The fully collapsed air holes at localized regions allowed the coupling of various modes and a red shift was detected when the fiber was subjected to medium of increasing refractive index. A poly-acrylamide hydrogel was then coated onto the PCF interferometer via a free radical polymerization mechanism. A novel method of copolymerizing glycidyl methacrylate with the monomer and cross-linkers incorporated epoxy groups as molecular recognition agents for 5-amino-8-hydroxyquinoline. At low concentration of Ni2+, the heavy metal form bisligand complexes with 8-hydroxyquinoline and serves as additional cross-linkages to the hydrogel, thereby causing it to shrink. At high concentration of Ni2+ however, Ni2+ bind to the ligand with a 1:1 ratio and break the cross-linkages, causing the hydrogel to swell. This Ni2+ induced hydrogel swelling and shrinkage manifests as a RI change, and can be transduced to an optical signal using the Mach-Zehnder type interferometer. |
| first_indexed | 2024-10-01T07:46:07Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/53696 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:46:07Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/536962023-03-03T15:39:45Z Fiber optic based sensor for Ni2+. Hong, Jesmond Xun Jie. Chan Chi Chiu School of Chemical and Biomedical Engineering DRNTU::Engineering This study aimed to combine the use of a Mach-Zehnder type interferometer and the hydrogel volume phase transition theory to quantitatively model the refractive index dependence upon Ni2+ concentration. A highly sensitive refractive index sensor was achieved via fusion splicing, sandwiching a 3 cm photonic crystal fiber (PCF) longitudinally in the middle of two SMFs. The fully collapsed air holes at localized regions allowed the coupling of various modes and a red shift was detected when the fiber was subjected to medium of increasing refractive index. A poly-acrylamide hydrogel was then coated onto the PCF interferometer via a free radical polymerization mechanism. A novel method of copolymerizing glycidyl methacrylate with the monomer and cross-linkers incorporated epoxy groups as molecular recognition agents for 5-amino-8-hydroxyquinoline. At low concentration of Ni2+, the heavy metal form bisligand complexes with 8-hydroxyquinoline and serves as additional cross-linkages to the hydrogel, thereby causing it to shrink. At high concentration of Ni2+ however, Ni2+ bind to the ligand with a 1:1 ratio and break the cross-linkages, causing the hydrogel to swell. This Ni2+ induced hydrogel swelling and shrinkage manifests as a RI change, and can be transduced to an optical signal using the Mach-Zehnder type interferometer. Bachelor of Engineering (Chemical and Biomolecular Engineering) 2013-06-07T01:21:30Z 2013-06-07T01:21:30Z 2013 2013 Final Year Project (FYP) http://hdl.handle.net/10356/53696 en Nanyang Technological University 68 p. application/pdf |
| spellingShingle | DRNTU::Engineering Hong, Jesmond Xun Jie. Fiber optic based sensor for Ni2+. |
| title | Fiber optic based sensor for Ni2+. |
| title_full | Fiber optic based sensor for Ni2+. |
| title_fullStr | Fiber optic based sensor for Ni2+. |
| title_full_unstemmed | Fiber optic based sensor for Ni2+. |
| title_short | Fiber optic based sensor for Ni2+. |
| title_sort | fiber optic based sensor for ni2 |
| topic | DRNTU::Engineering |
| url | http://hdl.handle.net/10356/53696 |
| work_keys_str_mv | AT hongjesmondxunjie fiberopticbasedsensorforni2 |