A study of monitoring hydrogen using mesoporous TiO2 synthesized by anodization

Moon, Jongyun; Hedman, Hannu‐Pekka; Kemell, Marianna; Suominen, Arho; Mäkilä, Ermei; Hong, Kim Jae; Tuominen, Aulis; Punkkinen, Risto

doi:10.1016/j.snb.2013.05.070

Cited by 16 publications

(12 citation statements)

References 22 publications

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“…The humidity reduced the sensor responses of H 2 and C 2 H 6 O. In contradiction with our observations, Moon et al presented that H 2 sensing of mesoporous titania was not effected by humidity variations (5%, 15%, 42%RH) at 140 • C [52]. Similarly, hydrothermally grown TiO 2 nanorods did not change the response values towards 1-100 ppm VOCs (ethanol, methanol, and propanol) at 75 • C under humidity variations (8%, 52%, 75%RH) [53].…”

Section: Gas Sensingcontrasting

confidence: 99%

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

et al. 2019

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The chemical routes of metal oxidation in presence of hydrogen peroxide solutions are tailor-made for the synthesis of biocompatible metal oxide surfaces with clean intermediate and end products, such as oxides, hydroxides, hydrogen and water. The hydrolysis of titanium in hydrogen peroxide solutions is particularly interesting for medical applications, forming micro- and nanoscale titania surfaces. In this paper, the content of the hydrolysis solution is revised, allowing the fabrication of gas sensor devices based on nanoporous titania. Nanopore and microcrack formations were discussed in detail by monitoring the structural changes on the thin film surface with field-emission scanning electron microscopy (FE-SEM). A stable rutile crystalline phase was detected by glancing incidence X-ray diffraction (GI-XRD) measurement after repetitive hydrothermal processes. Electrical conductance measurements were carried out at high temperatures (400–600 °C) under humid airflow (40% RH@20 °C) with the injection of various concentrations of a wide set of test compounds (C2H3N, CO, H2, NO2, C2H6O), to observe the sensing capabilities of the material. Furthermore, the humidity effects on the sensing properties toward H2, CO, and C2H6O have been discussed.

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Section: Gas Sensingcontrasting

confidence: 99%

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

et al. 2019

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“…The sample annealed at 500°C showed only anatase peak (101). This is in good agreement with other studies reported [22,29]. However, in the case of TiO 2 nanotubes prepared from Ti foil, a mixture of anatase and rutile can be obtained when annealed at 480°C [34].…”

Section: Characterization Of Pd Decorated Nanotubular Tio 2 Layersupporting

confidence: 92%

“…Thus, much effort has been recently contributed to developing gas sensors using anodic TiO 2 nanostructures on alternative substrates, which provide various advantages for microelectronic applications [22][23][24]. Several studies have reported the TiO 2 preparation Page 4 of 34 A c c e p t e d M a n u s c r i p t 4 on different base substrates, such as, conductive film (Indium tin oxide and Si) [25,26] and insulators (Al 2 O 3 , SiO 2 and glass) [22,27].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have reported the TiO 2 preparation Page 4 of 34 A c c e p t e d M a n u s c r i p t 4 on different base substrates, such as, conductive film (Indium tin oxide and Si) [25,26] and insulators (Al 2 O 3 , SiO 2 and glass) [22,27]. Essentially, the use of isolating substrates, such as SiO 2 /Si, enables placement of metal electrodes under the anodic oxide layer [28].…”

Section: Introductionmentioning

confidence: 99%

“…This work showed that the reduction in sensor size could improve hydrogen detection properties. Using these TiO 2 nanotube sensors on isolating substrates, however, still would require further improvements considering the sensitivity, due to poorer hydrogen detection ability than sensors directly prepared from Ti foil [22].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen sensor of Pd-decorated tubular TiO2 layer prepared by anodization with patterned electrodes on SiO2/Si substrate

Moon

Hedman

Kemell

et al. 2016

Sensors and Actuators B: Chemical

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Fast Growth of Highly Ordered TiO2 Nanotube Arrays on Si Substrate under High-Field Anodization

et al. 2016

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Highly ordered TiO2 nanotube arrays (NTAs) on Si substrate possess broad applications due to its high surface-to-volume ratio and novel functionalities, however, there are still some challenges on facile synthesis. Here, we report a simple and cost-effective high-field (90–180 V) anodization method to grow highly ordered TiO2 NTAs on Si substrate, and investigate the effect of anodization time, voltage, and fluoride content on the formation of TiO2 NTAs. The current density–time curves, recorded during anodization processes, can be used to determine the optimum anodization time. It is found that the growth rate of TiO2 NTAs is improved significantly under high field, which is nearly 8 times faster than that under low fields (40–60 V). The length and growth rate of the nanotubes are further increased with the increase of fluoride content in the electrolyte.Graphical AbstractHighly ordered TiO2 nanotube arrays (NTAs) on Si substrate have been fabricated by high-field anodization method. A high voltage (90–180 V) leads to a high growth rate of TiO2 NTAs (35–47 nm s−1), which is nearly 8 times faster than the growth rate under low fields (40–60 V). Furthermore, the current density–time curves recorded during the anodization provide a facial method to determine the optimal anodization parameters, leading to an easy obtaining of the desired nanotubes.

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A study of monitoring hydrogen using mesoporous TiO2 synthesized by anodization

Cited by 16 publications

References 22 publications

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

Hydrogen sensor of Pd-decorated tubular TiO2 layer prepared by anodization with patterned electrodes on SiO2/Si substrate

Fast Growth of Highly Ordered TiO2 Nanotube Arrays on Si Substrate under High-Field Anodization

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