A hydrogen gas sensor employing vertically aligned TiO2 nanotube arrays prepared by template-assisted method

Lee, Jiwon; Kim, Dai Hong; Hong, Sung Je; Jho, Jae Young

doi:10.1016/j.snb.2011.08.001

Cited by 101 publications

(53 citation statements)

References 26 publications

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“…This is also the case when designing sensors from TiO 2 nanotubes as illustrated in Figure 40. It shows the relative response and the sensitivity of two different titanium oxide nanotube array-based gas sensors; the data is taken from work of Li et al 47 and Lee et al 835 . In general, the relative change of resistivity can be calculated according to equation (12) and the sensitivity is estimated by its slope.…”

Section: Response and Sensitivitymentioning

confidence: 99%

One-Dimensional Titanium Dioxide Nanomaterials: Nanotubes

2014

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Section: Response and Sensitivitymentioning

confidence: 99%

One-Dimensional Titanium Dioxide Nanomaterials: Nanotubes

2014

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“…Since their introduction [1,2], TiO 2 nanotube layers produced by anodization of Ti have attracted wide interest due to their application in various fields, such as dye-sensitized solar cells [3][4][5][6][7], sensors [8][9][10] or photocatalysis [11][12][13]. Overviews about applications are also given in several review articles [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Self-organized Anodic TiO2 Nanotube Layers: Influence of the Ti substrate on Nanotube Growth and Dimensions

Sopha

Jäger

Knotek

et al. 2016

Electrochimica Acta

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In this contribution, various Ti thin substrates were explored and compared for the anodic growth of self-organized TiO 2 nanotube layers for the first time. In order to evaluate differences in the electrochemical anodization characteristics and the tube dimensions, five different Ti substrates from four established suppliers were anodized in the widely used ethylene glycol electrolytes containing 88 mM NH 4 F and 1,5 vol.% water. Two anodizations were carried out to elucidate an influence of the pre-anodized substrates used for the second anodization. By thorough evaluation of the nanotube dimensions, large variations between the dimensions of the nanotubes were found for the different substrates, ranging from ~32 µm to ~50 µm for the nanotube length and from ~109 nm to ~127 nm for the nanotube diameter after the second anodization. Upon AFM measurements, Goodfellow Ti substrates (99.99 % purity), yielded the smoothest surface and the highest degree of ordering from all substrates.Moreover, considerably different consumption of Ti substrates via anodization was revealed by profilometric measurements between the original non-anodized part of the Ti substrates, and the anodized part after the removal of the nanotube layer. Orientation imaging 2 microscopy revealed considerable differences in the size and orientation of the substrate grains.

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“…Since the first reports by Assefpour-Dezfuly in 1984 [1] and by Zwilling et al in 1999 [2], the formation of TiO 2 nanotubes by anodization of titanium has attracted significant attention due to the great application of the nanotubes in various fields, such as dye sensitized solar cells [3][4][5][6][7], sensors [8][9][10][11][12], photocatalysis [13][14][15], and biomedical applications [16][17][18]. For the first generation of nanotube arrays HF-containing electrolytes were employed [1,19,20].…”

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confidence: 99%

Effect of electrolyte age and potential changes on the morphology of TiO2 nanotubes

Sopha

Hromádko

Nechvílová

et al. 2015

Journal of Electroanalytical Chemistry

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In the present work we report on the influence of the age of ethylene glycol-based electrolytes on the synthesis of self-organized TiO 2 nanotube layers. Electrolytes of different ages, defined by the total duration for anodization, were explored in order to get insight about how the tube structure changes with the electrolyte age. The results show a strong dependence of the electrolyte age upon the nanotube length and diameter -a phenomena surprisingly not discussed in existing literature. When fresh electrolytes are employed, nanotube arrays with a high aspect ratio are received, while in older electrolytes (i.e. already used for anodization) the nanotube arrays exhibit low aspect ratios. This is very important aspect for the reproducible synthesis of the nanotube layers. Moreover, the effect of the potential on the nanotube dimensions was investigated. Linear dependence of the diameter upon the potential was observed. Last, but not least, the influence of a potential change towards the end of the anodization time was studied. By sweeping the potential to 100 V, or to 5 V and keeping this for one hour after applying a constant potential of 60 V for 4 hours, nanotubes underwent interesting morphological changes. In particular, when slow sweeping from 60 V to 5 V was carried out, small nanotubes grew in the gaps between the initial nanotubes. Interestingly, these nanotubes layers showed lower adhesion to the underlying substrates.

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A hydrogen gas sensor employing vertically aligned TiO2 nanotube arrays prepared by template-assisted method

Cited by 101 publications

References 26 publications

One-Dimensional Titanium Dioxide Nanomaterials: Nanotubes

One-Dimensional Titanium Dioxide Nanomaterials: Nanotubes

Self-organized Anodic TiO2 Nanotube Layers: Influence of the Ti substrate on Nanotube Growth and Dimensions

Effect of electrolyte age and potential changes on the morphology of TiO2 nanotubes

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