Sensing characteristics of an optical fiber sensor for hydrogen leak

Okazaki, Shinji; Nakagawa, Hidemoto; Asakura, Shukuji; Tomiuchi, Yoshimasa; Tsuji, Nobuhiko; Murayama, Hideaki; Washiya, Masahito

doi:10.1016/s0925-4005(03)00211-9

Cited by 119 publications

(80 citation statements)

References 16 publications

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“…Among them, optical methods such as fiber-optic gas sensors have the advantages of being explosion-proof and immune to electromagnetic noise. (6) Most optical sensors are based on changes in the optical properties of chemochromic materials such as palladium, (7) metal oxides, (8,9) metal hydrides, (10) and magnesium-containing alloys.…”

Section: Introductionmentioning

confidence: 99%

“…(9) Tungsten trioxide using palladium or platinum as the catalyst for the dissociation of the hydrogen molecule is a typical candidate for a gasochromic material. (13) These films are nearly transparent in air atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…(12) The authors have been developing a hydrogen sensor device based on the sol-gel-derived platinum-supported tungsten trioxide (Pt/WO 3 ) thin film and have demonstrated its performance as a sensor. (9) Many researchers reported that the gasochromic performance of WO 3 is severely influenced by fabrication parameters such as annealing conditions, catalyst loading, and others. (14)(15)(16)(17) To achieve low-cost and high-performance sensors, further improvements and optimization of sensing film are needed.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method

2017

Sensors and Materials

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The sensing performance of a sol-gel-derived Pt/WO 3 film used in an optical hydrogen gas sensor was evaluated and optimized. The Pt/WO 3 film was deposited on a quartz glass substrate by the sol-gel method based on the acidification of Na 2 WO 3 aqueous solutions. Optical transmittance changes of the films as a result of exposure to hydrogen-containing gas were measured in the near-infrared region. The sensor performance was severely affected by fabrication parameters such as annealing conditions, precursor concentration, and catalyst loading. In the case of annealing at 500 °C, high sensitivity and fast response were obtained. An annealing time of at least 0.5 h was required to attain stable performance, and long annealing times had no effect on the sensitivity. However, the sensor performance and transparency of the film became poorer in the case of a ratio of over 0.4. The atomic ratio of Pt to W showed a considerable effect on the sensing characteristics. Both the sensitivity and response kinetics were promoted with increasing Pt loading. When the ratio was about 0.35, maximum sensitivity was observed. The concentration of the Na 2 WO 4 solution used in the sol-gel process was also an important parameter. The sensitivity increased with increasing concentration since the thickness of the sensing film increased. The dependence of response speed on concentration was larger than that of recovery speed. When the film was exposed to H 2 /N 2 gas, good response was observed; the hydrogen detection limit was about 0.001 vol% and minimal influence of water vapor was noted. The sensing performance, however, became poorer because oxygen inhibited the reaction when the film was exposed to hydrogen-containing air.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method

2017

Sensors and Materials

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“…The optical and electrical properties of the 1D nanostructures coated with catalyst can change upon exposure to gas and can be restored upon reexposure to air even at room temperature. [13][14][15][16][17][18][19][20] Such low temperature-processes are very desirable in detecting toxic gases safely.…”

Section: Introductionmentioning

confidence: 99%

CO Gas-Sensor Based on Pt-Functionalized Mg-Doped ZnO Nanowires

Jin¹,

Park²,

Kim³

et al. 2012

Bulletin of the Korean Chemical Society

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Mg-doped ZnO one-dimensional (1D) nanostrutures were synthesized by using a thermal evaporation technique. The morphology, crystal structure, and sensing properties of the Mg-doped ZnO nanostructures functionalized with Pt to CO gas at 100 o C were examined. The diameters of the 1D nanostructures ranged from 80 to 120 nm and that the lengths were up to a few tens of micrometers. The gas sensors fabricated from multiple networked Mg-doped ZnO nanowires functionalized with Pt showed enhanced electrical response to CO gas. The responses of the nanowires were improved by approximately 70, 69, 111, and 81 times at CO concentrations of 10, 25, 50, and 100 ppm, respectively. Both the response and recovery times of the nanowire sensor for CO gas sensing were not nearly changed by Pt functionalization. It also appeared that the Mg doping concentration did not influence the sensing properties of ZnO nanowires as strongly as Pt-functionalization. In addition, the mechanism for the enhancement in the CO gas sensing properties of Mg-doped ZnO nanowires by Pt functionalization is discussed.

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“…These include conductometric sensors relying on conductance or resistance changes, potentiometric or amperometric devices utilizing solid-state electrochemical cells, semiconducting metal oxide field effect transistors (MOSFET), and mass sensitive devices based on bulk or surface acoustic waves. Other devices, such as thermoelectric sensors [2][3][4] or optical evanescent field devices [5,6] are beyond the scope of this review and are not included here.…”

Section: Introductionmentioning

confidence: 99%

Novel deposition techniques for metal oxide: Prospects for gas sensing

Sahner

Tuller

2008

J Electroceram

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With the growing need for high performance gas sensors, a variety of preparation methods have been introduced and investigated. In the present contribution, the focus is on novel means for preparing metal oxide gas sensor devices. First, the key gas sensor concepts are reviewed as well as the conventional deposition techniques widely used for thick and thin film deposition of metal oxides such as screen-printing and chemical and physical vapour deposition. This is followed by a review and examination of innovative deposition techniques developed within the past several years, focusing on methods with direct-write features as well as techniques offering precise control of micro-and nano-structural features of the deposited materials.

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Sensing characteristics of an optical fiber sensor for hydrogen leak

Cited by 119 publications

References 16 publications

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method

CO Gas-Sensor Based on Pt-Functionalized Mg-Doped ZnO Nanowires

Novel deposition techniques for metal oxide: Prospects for gas sensing

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Sensing characteristics of an optical fiber sensor for hydrogen leak

Cited by 119 publications

References 16 publications

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol&ndash;Gel Method

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol&ndash;Gel Method

CO Gas-Sensor Based on Pt-Functionalized Mg-Doped ZnO Nanowires

Novel deposition techniques for metal oxide: Prospects for gas sensing

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Product

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Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method