Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid)
Heavy metal ions in drinking water is hazardous to human health. Notably, nickel would cause respiratory problems, DNA damage, and more. Before consuming unknown water sources, detection of these metal ions is necessary. A heavy metal ion optical fiber sensor based on Mach-Zehnder interferometer...
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2017
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| Online Access: | http://hdl.handle.net/10356/70966 |
| _version_ | 1826114375549714432 |
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| author | Maa, Han Lun |
| author2 | Chan Chi Chiu |
| author_facet | Chan Chi Chiu Maa, Han Lun |
| author_sort | Maa, Han Lun |
| collection | NTU |
| description | Heavy metal ions in drinking water is hazardous to human health. Notably, nickel would cause respiratory problems, DNA damage, and more. Before consuming unknown water sources, detection of these metal ions is necessary.
A heavy metal ion optical fiber sensor based on Mach-Zehnder interferometer (MZI) formed by using cascading with two coating-functionalized taper fibers was proposed and experimentally demonstrated.
The tapered fiber sensor with approximate sensing length of 1mm and waist diameter of 30µm was coated using layer-by-layer technique. This allows carbon nanotubes/ chitosan and poly(acrylic acid) to be stacked on each other, creating multiple bilayers that increase chelating sites for nickel ions to attach on. As the heavy metal ions got absorbed by the coating, transmission spectrum of MZI changes due to refractive index variation of the coating. By modulating the intensity of the spectrum, concentration of heavy metal ions can be measured.
Results shown that the design is suitable to detect low concentration nickel ions, from 0.3mM to 0.8mM, with sensitivity of 50.879dB/mM. It is also capable of detecting tin ions, with sensitivity of 11.782dB/mM. On top of this, the interferometric sensor is able for limited reuse, with negligible influence from temperature, making it a suitable choice for heavy metal ions detection in water bodies. |
| first_indexed | 2024-10-01T03:38:08Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/70966 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:38:08Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/709662023-03-03T15:33:45Z Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid) Maa, Han Lun Chan Chi Chiu School of Chemical and Biomedical Engineering DRNTU::Engineering::Bioengineering Heavy metal ions in drinking water is hazardous to human health. Notably, nickel would cause respiratory problems, DNA damage, and more. Before consuming unknown water sources, detection of these metal ions is necessary. A heavy metal ion optical fiber sensor based on Mach-Zehnder interferometer (MZI) formed by using cascading with two coating-functionalized taper fibers was proposed and experimentally demonstrated. The tapered fiber sensor with approximate sensing length of 1mm and waist diameter of 30µm was coated using layer-by-layer technique. This allows carbon nanotubes/ chitosan and poly(acrylic acid) to be stacked on each other, creating multiple bilayers that increase chelating sites for nickel ions to attach on. As the heavy metal ions got absorbed by the coating, transmission spectrum of MZI changes due to refractive index variation of the coating. By modulating the intensity of the spectrum, concentration of heavy metal ions can be measured. Results shown that the design is suitable to detect low concentration nickel ions, from 0.3mM to 0.8mM, with sensitivity of 50.879dB/mM. It is also capable of detecting tin ions, with sensitivity of 11.782dB/mM. On top of this, the interferometric sensor is able for limited reuse, with negligible influence from temperature, making it a suitable choice for heavy metal ions detection in water bodies. Bachelor of Engineering (Chemical and Biomolecular Engineering) 2017-05-12T05:21:15Z 2017-05-12T05:21:15Z 2017 Final Year Project (FYP) http://hdl.handle.net/10356/70966 en Nanyang Technological University 35 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Bioengineering Maa, Han Lun Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid) |
| title | Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid) |
| title_full | Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid) |
| title_fullStr | Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid) |
| title_full_unstemmed | Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid) |
| title_short | Detection of nickel ions using mach-zehnder inteferometric sensor coated with carbon nanotubes & chitosan & poly(acrylic acid) |
| title_sort | detection of nickel ions using mach zehnder inteferometric sensor coated with carbon nanotubes chitosan poly acrylic acid |
| topic | DRNTU::Engineering::Bioengineering |
| url | http://hdl.handle.net/10356/70966 |
| work_keys_str_mv | AT maahanlun detectionofnickelionsusingmachzehnderinteferometricsensorcoatedwithcarbonnanotubeschitosanpolyacrylicacid |