Response kinetics of a fiber-optic gas sensor using Pt/WO3 thin film to hydrogen

Matsuyama, N.; Okazaki, Shinji; Nakagawa, Hidemoto; Sone, Hayato; Fukuda, K.

doi:10.1016/j.tsf.2009.01.126

Cited by 39 publications

(18 citation statements)

References 16 publications

(15 reference statements)

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“…9(a). The reason behind this is the chemical sensitization effect of PdO NPs in the system, because the PdO NPs act as a catalyst, which facilitates the dissociation of oxygen molecules into O atoms: [46][47][48] O 2(gas) ↔ 2O (ads)…”

Section: Gas-sensing Mechanism Of the Pdo@zno P-n Heterojunction Csnsmentioning

confidence: 99%

Construction of novel hybrid PdO–ZnO p–n heterojunction nanostructures as a high-response sensor for acetaldehyde gas

et al. 2019

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Section: Gas-sensing Mechanism Of the Pdo@zno P-n Heterojunction Csnsmentioning

confidence: 99%

Construction of novel hybrid PdO–ZnO p–n heterojunction nanostructures as a high-response sensor for acetaldehyde gas

et al. 2019

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“…[12][13][14][15][16][17][18][19][20][21][22][23] This feature helps find any difference of time dependences of electrical response and optical transmittance response, because the former is more sensitive to surface reaction and the latter is more dependent on the bulk reaction throughout the light path. The time dependences of optical reflectance due to the reflected light from the gas-film interface or that from the film-substrate interface may have some difference if diffusion of detected gas molecules/atoms needs some time to diffuse inside the material.…”

Section: A Flexibility and Versatilitymentioning

confidence: 99%

“…[12][13][14][17][18][19][20][21][22] In continuous flow method, admixture containing the detected gas is kept to flow throughout a test. If a net H 2 flow of 0.016 sccm is applied as in the previous example, a flow of 16 000 sccm of balancing gas is required to dilute H 2 to 1 ppm.…”

Section: B Control Of Gas Compositionmentioning

confidence: 99%

“…In continuous flow technique without pumping, 14,[20][21][22] the switching of gaseous environment relies on diffusion mechanism and hence is usually smooth. In our system, evacuation of the measurement chamber is forced by a vacuum pump, and the ensuing charging step is conducted by opening a valve for the gas to rush into the measurement zone via a free expansion-like process.…”

Section: Accuracy In Response Time Measurementmentioning

confidence: 99%

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Versatile computer-controlled system for characterization of gas sensing materials

Zhao

Huang

Wong

et al. 2011

Review of Scientific Instruments

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Enhanced H2 sensitivity at room temperature of ZnO nanowires functionalized by Pd nanoparticles J. Appl. Phys. 110, 084312 (2011) Expanded beam deflection method for simultaneous measurement of displacement and vibrations of multiple microcantilevers Rev. Sci. Instrum. 82, 105112 (2011) High quality factor graphene varactors for wireless sensing applications Appl. Phys. Lett. 99, 163105 (2011) The extended surface forces apparatus. IV. Precision static pressure control Rev. Sci. Instrum. 82, 103902 (2011) Effect of temperature on CO detection sensitivity of ZnO nanorod-gated AlGaN/GaN high electron mobility transistors Appl. Phys. Lett. 99, 142107 (2011) Additional information on Rev. Sci. Instrum. Design of a system used for characterizing gas sensing materials is described. It is distinctive of being able to measure electrical and optical responses of a sample simultaneously, control a number of measurement parameters, perform fast exchange of gaseous environment, and be fully controlled automatically. These features make the system to be versatile in determining most concerned performance indexes of a gas sensing material (e.g., sensitivity, stability, selectivity, response/recovery times, etc.) as functions of various combinations of measurement conditions (e.g., gas concentrations, temperature, total pressure, content of interferants, photo assist, relative humidity, soaking time in a fixed gas concentration, and number of switching cycles in a dynamic test, etc.). Rationales of the designs associated with general gas sensing mechanics are discussed.

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“…Over the past few decades, there have been many reports on gas sensors based on different nanomaterials, including ZnO, Ga 2 O 3 , TiO 2 , WO 3 , SnO 2 , In 2 O 3 , and Fe 2 O 3 , nanostructures. In addition, gas sensors have also been fabricated by synthesis methods involving doping, surface functionalization, and the use of heterostructures . Among these methods, the functional modification of the surfaces of nanostructures with protuberances is probably the simplest and most effective technique for improving gas sensor performance.…”

Section: Introductionmentioning

confidence: 99%

NO₂ Sensing Properties of Bead‐like TeO₂ Nanostructures Fabricated Using Different O₂ Flow Rates

Shin

Park

Jeong

et al. 2015

Bulletin Korean Chem Soc

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We report the synthesis of bead-like TeO 2 nanowire (NW)-based NO 2 gas sensors using different O 2 flow rates. The performance of these sensors was compared with that of a sensor based on smooth TeO 2 NWs. The smooth TeO 2 NWs were grown directly from Te powder by thermal evaporation in air (i.e., without using O 2 gas), while the bead-like TeO 2 NWs were synthesized by transporting the evaporated Te precursor indirectly using reactive O 2 gas at flow rates of 20-40 sccm. Scanning electron microscopy showed that the bead-like TeO 2 NWs had uneven surfaces on which protruding nanoparticles with sizes of 20-100 nm were attached. The nanoparticle size varied with the O 2 flow rate used. The responses of the gas sensors based on the multi-networked bead-like TeO 2 NWs were indicative of a higher change in their electrical resistance as well as better selectivity to NO 2 gas than those of the sensor based on the smooth TeO 2 NWs. The individual responses-to 50 ppm NO 2 gas at 350 C-of the sensors based on TeO 2 NWs fabricated without using O 2 , using O 2 at 20 sccm, using O 2 at 30 sccm, and using O 2 at 40 sccm were 113, 188, 220, and 345%, respectively. The underlying mechanisms responsible for the improved performances of the bead-like TeO 2 NW-based sensors are also discussed.

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Response kinetics of a fiber-optic gas sensor using Pt/WO3 thin film to hydrogen

Cited by 39 publications

References 16 publications

Construction of novel hybrid PdO–ZnO p–n heterojunction nanostructures as a high-response sensor for acetaldehyde gas

Construction of novel hybrid PdO–ZnO p–n heterojunction nanostructures as a high-response sensor for acetaldehyde gas

Versatile computer-controlled system for characterization of gas sensing materials

NO₂ Sensing Properties of Bead‐like TeO₂ Nanostructures Fabricated Using Different O₂ Flow Rates

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Response kinetics of a fiber-optic gas sensor using Pt/WO3 thin film to hydrogen

Cited by 39 publications

References 16 publications

Construction of novel hybrid PdO–ZnO p–n heterojunction nanostructures as a high-response sensor for acetaldehyde gas

Construction of novel hybrid PdO–ZnO p–n heterojunction nanostructures as a high-response sensor for acetaldehyde gas

Versatile computer-controlled system for characterization of gas sensing materials

NO2 Sensing Properties of Bead‐like TeO2 Nanostructures Fabricated Using Different O2 Flow Rates

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Product

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About

NO₂ Sensing Properties of Bead‐like TeO₂ Nanostructures Fabricated Using Different O₂ Flow Rates