Formation Of Tio2nanotubular Structure In Fluorinated Ethylene Glycol Electrolytes Containing Additives By Anodisation

Taib, Mustaffa Ali Azhar (2018) Formation Of Tio2nanotubular Structure In Fluorinated Ethylene Glycol Electrolytes Containing Additives By Anodisation. PhD thesis, Universiti Sains Malaysia.

[img]
Preview
PDF
Download (450kB) | Preview

Abstract

TiO2 nanotube arrays (TNTs) have attracted significant interest as the most promising candidate for photo-induced reaction applications. The electrolyte composition is the one of critical factor for oxide formation by anodisation. The TNTs were fabricated in ethylene glycol (EG)/ ammonium fluoride (NH4F) electrolyte containing various additives (H2O, H2O2, KOH, LiOH and Na2CO3) as O2- and/or OH- providers. The properties including morphology, structural of formed oxide and crystallinity were investigated. The TNTs formed in EG/NH4F/H2O2 resulted in grassy structure (wall thickness ~ 10 nm) owing to high chemical etching at the tip of nanotubes. The TNTs formed in EG/NH4F/KOH electrolyte was partially crystalline with average tubes length 6.1 μm. The OH- ions suppress the excessive surface etching at the tips of nanotubes. Meanwhile, the addition of Na2CO3 in EG/NH4F electrolyte was successfully formed as-anodised free standing TNTs (FSTNTs) due to gas evolution which aids in weakening the adherence of anodic film on Ti. The as-anodised FSTNTs contain nanocrystallite anatase. The grassy TNTs demonstrated the highest c decolouration efficiency of MO (91.7%) after 2 h owing to the capability of anatase phase to retain at 600 oC at the tip of grassy structure.

Item Type: Thesis (PhD)
Subjects: T Technology
T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral (School of Material & Mineral Resource Engineering) > Thesis
Depositing User: Mr Mohamed Yunus Mat Yusof
Date Deposited: 02 Oct 2020 08:16
Last Modified: 22 Oct 2020 03:03
URI: http://eprints.usm.my/id/eprint/47433

Actions (login required)

View Item View Item
Share