ZnO And MoSexOy Modified TiO2 Nanotubes For Photoelectrochemical And Sensing Applications
One-dimensional (1D) anodic self-organized TiO2 nanotube layers have attracted considerable scientific and technological interest over a decade. The major drawbacks are their rather wide band gap energies (3.0–3.2 eV) with high photoactivity only in the ultraviolet (UV) spectral region (l � 390 n...
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| Format: | Thesis |
| Language: | English |
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2018
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| Online Access: | http://eprints.usm.my/48533/ http://eprints.usm.my/48533/1/NG%20SIOW%20WOON_hj.pdf |
| _version_ | 1848881181376905216 |
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| author | Ng, Siow Woon |
| author_facet | Ng, Siow Woon |
| author_sort | Ng, Siow Woon |
| building | USM Institutional Repository |
| collection | Online Access |
| description | One-dimensional (1D) anodic self-organized TiO2 nanotube layers have attracted
considerable scientific and technological interest over a decade. The major drawbacks
are their rather wide band gap energies (3.0–3.2 eV) with high photoactivity only in the
ultraviolet (UV) spectral region (l � 390 nm, �5% of the solar spectrum), relatively
low conductivity and high carrier recombination rate. Furthermore, as a high aspect
ratio (HAR) nanostructure, the deposition of a uniform secondary coating within the
TiO2 nanotube layers remains a challenge. To overcome these critical issues, present
work is intended (i) to synthesize anodic 1D TiO2 nanotube layers as an independent
semiconductor and for the incorporation of secondary materials; (ii) to produce homogeneous
and conformal ZnO and MoSexOy coatings by atomic layer deposition (ALD)
within TiO2 nanotube layers; (iii) to form heterostructure in order to enhance charge
transport efficiency, increase light absorption and extend the functional range to the visible
spectral region; and (iv) to evaluate UV photodetection responses, ethanol sensing
responses at low temperatures, photocurrent generation and photocatalytic degradation
of methylene blue (MB). The synthesis of the TiO2 nanotube layers was carried
out by a conventional electrochemical anodization of Ti sheet in fluorinated organic
electrolytes. A low bias, visible-blind, UV photodetector was constructed in a sandwich
structure comprising of ITO/electrolyte/TiO2 nanotubes/Ti for the first time to
investigate the photodetection in UV-A, B and C spectral regions. |
| first_indexed | 2025-11-15T18:14:56Z |
| format | Thesis |
| id | usm-48533 |
| institution | Universiti Sains Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T18:14:56Z |
| publishDate | 2018 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | usm-485332021-03-08T03:50:52Z http://eprints.usm.my/48533/ ZnO And MoSexOy Modified TiO2 Nanotubes For Photoelectrochemical And Sensing Applications Ng, Siow Woon QC1 Physics (General) One-dimensional (1D) anodic self-organized TiO2 nanotube layers have attracted considerable scientific and technological interest over a decade. The major drawbacks are their rather wide band gap energies (3.0–3.2 eV) with high photoactivity only in the ultraviolet (UV) spectral region (l � 390 nm, �5% of the solar spectrum), relatively low conductivity and high carrier recombination rate. Furthermore, as a high aspect ratio (HAR) nanostructure, the deposition of a uniform secondary coating within the TiO2 nanotube layers remains a challenge. To overcome these critical issues, present work is intended (i) to synthesize anodic 1D TiO2 nanotube layers as an independent semiconductor and for the incorporation of secondary materials; (ii) to produce homogeneous and conformal ZnO and MoSexOy coatings by atomic layer deposition (ALD) within TiO2 nanotube layers; (iii) to form heterostructure in order to enhance charge transport efficiency, increase light absorption and extend the functional range to the visible spectral region; and (iv) to evaluate UV photodetection responses, ethanol sensing responses at low temperatures, photocurrent generation and photocatalytic degradation of methylene blue (MB). The synthesis of the TiO2 nanotube layers was carried out by a conventional electrochemical anodization of Ti sheet in fluorinated organic electrolytes. A low bias, visible-blind, UV photodetector was constructed in a sandwich structure comprising of ITO/electrolyte/TiO2 nanotubes/Ti for the first time to investigate the photodetection in UV-A, B and C spectral regions. 2018-09 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/48533/1/NG%20SIOW%20WOON_hj.pdf Ng, Siow Woon (2018) ZnO And MoSexOy Modified TiO2 Nanotubes For Photoelectrochemical And Sensing Applications. PhD thesis, Universiti Sains Malaysia. |
| spellingShingle | QC1 Physics (General) Ng, Siow Woon ZnO And MoSexOy Modified TiO2 Nanotubes For Photoelectrochemical And Sensing Applications |
| title | ZnO And MoSexOy Modified TiO2 Nanotubes
For Photoelectrochemical And
Sensing Applications |
| title_full | ZnO And MoSexOy Modified TiO2 Nanotubes
For Photoelectrochemical And
Sensing Applications |
| title_fullStr | ZnO And MoSexOy Modified TiO2 Nanotubes
For Photoelectrochemical And
Sensing Applications |
| title_full_unstemmed | ZnO And MoSexOy Modified TiO2 Nanotubes
For Photoelectrochemical And
Sensing Applications |
| title_short | ZnO And MoSexOy Modified TiO2 Nanotubes
For Photoelectrochemical And
Sensing Applications |
| title_sort | zno and mosexoy modified tio2 nanotubes
for photoelectrochemical and
sensing applications |
| topic | QC1 Physics (General) |
| url | http://eprints.usm.my/48533/ http://eprints.usm.my/48533/1/NG%20SIOW%20WOON_hj.pdf |