A room-temperature operated hydrogen leak sensor

Nakagawa, Hidemoto; Yamamoto, Naoto; Okazaki, Shinji; Chinzei, T.; Asakura, Shukuji

doi:10.1016/s0925-4005(03)00201-6

Cited by 105 publications

(68 citation statements)

References 25 publications

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“…Hydrated WO 3 films obtained by the sol-gel method are characterized at all E values by continuous increase in D eff with their coloration with Li + [35], which is caused, in the opinion of the present authors, by an increase in electronic conductivity. This agrees with the fact that in the course of coloration of such films, their electronic conductivity increases by a factor of over 10 6 [36].…”

Section: Discussionsupporting

confidence: 89%

Optical and kinetic properties of cathodically deposited amorphous tungsten oxide films

Krasnov

Волков

Kolbasov

2006

Journal of Non-Crystalline Solids

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Section: Discussionsupporting

confidence: 89%

Optical and kinetic properties of cathodically deposited amorphous tungsten oxide films

Krasnov

Волков

Kolbasov

2006

Journal of Non-Crystalline Solids

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“…However, as they are commonly operated at elevated temperatures, typically several hundred degrees Celsius, to enhance gas sensitivities and enable fast and reversible reactions, the elevated operating temperatures are not favorable for many applications, particularly those involving flammable environments and those requiring low power operation. Only a few studies employing metal oxide semiconductors for room temperature hydrogen sensing can be found in the literature [32]. The TiO 2 nanotube array-based sensors can be operated at unheated room temperature to measure low concentration hydrogen, such as the transcutaneous gas, to determine the lactose intolerance [3] which is caused by the inability to digest significant amounts of lactose.…”

Section: Sensing Applications Of Titania Nanotube Arrays 21 Hydrogenmentioning

confidence: 99%

A review on TiO2 nanotube arrays: Fabrication, properties, and sensing applications

Yang

Luo

Cai³

et al. 2010

Chin. Sci. Bull.

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Fabrication, properties, and sensing applications of TiO 2 nanotubes have been reviewed, and the highly ordered TiO 2 nanotube arrays made by anodic oxidation in fluoride-contained electrolytes highlighted. The effect of anodization parameters (electrolyte, pH, and voltage) on the titania nanotube size and shape were discussed. The excellent biocompatibility of TiO 2 , the high orientation, the large surface area with tunable pore sizes, as well as the high electron transfer rate along with the nanotubes make TiO 2 nanotube array an ideal substrate for the sensor's fabrication and application. The sensors based on the TiO 2 nanotube arrays for sensing hydrogen, oxygen, humidity, glucose and hydrogen peroxide all exhibited low detection limit, high stability, very good reproducibility and high sensitivity. anodization, TiO 2 nanotube arrays, sensor Citation:Yang L X, Luo S L, Cai Q Y, et al. A review on TiO 2 nanotube arrays: Fabrication, properties, and sensing applications.Nanostructural titania is one of the most widely studied materials due to its unique and excellent properties in optics, electronics, photochemistry and biology, as well as its applications in photovoltaic cells, photocatalysis, and sensors [1-3]. Among the various forms of nanostructural titania, nanotubular titania has attracted increasing interest due to its highly ordered structure and the convenient controlling of the size. Reviews have been given on the fabrication, properties, and applications of titania nanotubes in solar cells [4−6]. It is known that the sensors are increasingly demanded in medicinal, industrial, environmental applications. Sufficient sensitivity, high stability, short response time and long length of life are all key factors for a sensor's application in practice. Generally, the performance of the chemical sensors is optimized by improving the electric properties of the sensor through modifying or selecting more ideal substrates with excellent morphology. With the advent of nanotechnology, it has become evident that nanoscale architectural features of the functional materials applied in sensing can yield superior and unexpected electric behaviors. Recently, TiO 2 nanotube arrays fabricated by anodization were applied in the fabrication of gas sensors and biosensors [3]. The highly uniform morphology, unique orientated growing property, and large surface area with controllable pore sizes as well as the facile fabrication make the titania nanotube array a promising functional material for application in sensors. Furthermore, the photovoltaic property of TiO 2 under UV illumination makes the sensors self-clean the contamination, resulting in a long length of life. Consequently, in this review we focus on the recent developments in the fabrication, modification, and sensing application of the anodized titania nanotubes, which would open up new avenues for the development of sensors.

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“…However, these types of sensors usually have some limitations, such as the requirement for high temperatures, which creates problems for their widespread use. Except for titanium oxide (in nanotube form), only a few metal oxide semiconductors, such as tungsten oxide and porous silicon, are applicable for room temperature hydrogen sensing, [3][4][5] and among these few metal oxide semiconductors with different structures, titanium oxide nanotubes are noticeable because of their extraordinary sensitivity to the presence of hydrogen gas at such low concentrations. If titanium oxide nanotubes are synthesized properly, when exposed to hydrogen at room temperature, they can represent a large change in electrical properties.…”

Section: Introductionmentioning

confidence: 99%

The effect of highly ordered titania nanotube structures on hydrogen gas detection

Asl

Alavi

Ahmadi

2012

Surface & Interface Analysis

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Different titanium oxide nanotubes were synthesized by anodizing the surface of titanium foil in two electrolyte solutions containing hydrofluoric acid and ethylene glycol. The samples were heat-treated in a furnace. The microstructure and phase transformations of the nanotubes were investigated by X-ray diffraction and field emission-scanning electron microscope. The nanoscale geometry of the nanotubes is responsible for the outstanding hydrogen gas sensitivities. A remarkable variation in electrical conductance has been observed in titanium oxide nanotube arrays that were prepared in hydrofluoric acid. This sensor exhibits a large resistance variation in the presence of very small quantities of hydrogen gas at 25 C. The sensors show reversibility, repeatability, negligible drift, and wide dynamic range.

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A room-temperature operated hydrogen leak sensor

Cited by 105 publications

References 25 publications

Optical and kinetic properties of cathodically deposited amorphous tungsten oxide films

Optical and kinetic properties of cathodically deposited amorphous tungsten oxide films

A review on TiO2 nanotube arrays: Fabrication, properties, and sensing applications

The effect of highly ordered titania nanotube structures on hydrogen gas detection

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