Ultra-sensitive hydrogen gas sensors based on Pd-decorated tin dioxide nanostructures: Room temperature operating sensors

Lee, Jun Min; Park, Ji Eun; Kim, Seri; Kim, Sol; Lee, Eun-Young; Kim, Sung Jin; Lee, Wooyoung

doi:10.1016/j.ijhydene.2010.08.026

Cited by 108 publications

(46 citation statements)

References 21 publications

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“…In addition to low cost, these sensors demonstrate high sensitivity and fast response [8]. However, oxygen is always required in order to recover and maintain the sensing ability of such materials [9–12]. The traditional semiconducting metal oxides sensors also usually require the optimum operation temperature above 350 °C.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the H2S poisoning process for sensing composite material based on carbon nanotubes and metal oxides

Duan

Pirolli

Teplyakov

2016

Sensors and Actuators B: Chemical

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The poisoning of H2S sensing material based on the mixture of acid-treated carbon nanotubes, CuO and SnO2 was investigated by exposing the material to high doses of H2S (1% in volume) and following the changes spectroscopically. The presence of metal sulfides (CuS and SnS2), sulfates and thiols was confirmed on the surface of this material as the result of H2S poisoning. Further study revealed that leaving this material in air for extended period of time led to reoxidation of metal sulfides back to metal oxides. The formation of thiols and sulfates directly on carbon nanotubes is not reversible under these conditions; however, the extent of the overall surface reaction in this case is substantially lower than that for the composite material.

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Section: Introductionmentioning

confidence: 99%

Investigation of the H2S poisoning process for sensing composite material based on carbon nanotubes and metal oxides

Duan

Pirolli

Teplyakov

2016

Sensors and Actuators B: Chemical

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“…Recently, Lee et al [31] reported the preparation of Pd/ SnO 2 composite nanorods by using NaBH 4 as reducing agent via a solution process, but the size of the Pd nanoparticles is large, limited their applications in the catalysis. Here, we report a simple and water-phase route for the synthesis of a polyaniline (PANI)/SnO 2 /Pd tri-component hybrid nanorod consisting of sub-3 nm Pd nanocrystals supported on core-sheath PANI/SnO 2 nanorods with a outdiameter of about 100-150 nm through an electron transfer reduction process.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Xue

Nie

2012

Catal Lett

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A facile and aqueous-phase method based on the electron transfer reduction process for fabricating coresheath structured polyaniline (PANI)/SnO 2 composite nanorods supported Pd nanocatalyst has been demonstrated. The Pd nanoparticles synthesized by this strategy have a small size of smaller than 3.0 nm. The well dispersed Pd nanoparticles with small sizes supported on coresheath PANI/SnO 2 composite nanorods exhibited an ultrahigh catalytic activity during the catalytic reduction of p-nitrophenol into p-aminophenol by NaBH 4 in aqueous solution. The kinetic apparent rate constant (k app ) reach to be about 26.9 9 10 -3 s -1 . It is believed that this method could be extended to cover many kinds of other functional composite nanomaterials where the active component is expected to bring in new features and applications.

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“…So the observed room-temperature hydrogen sensitivity for Pt-doped TiO 2 nanoceramics can be well explained: hydrogen molecules are first split into hydrogen atoms by Pt, and then react with oxygen molecules adsorbed on TiO 2 at room temperature, and the resistance of TiO 2 is thus decreased. However, Pd is also known to have a catalytic effect for hydrogen and is often used for achieving room-temperature hydrogen sensors [19]; it is strange that Pd-doped TiO 2 nanoceramics are found to show no detectable responses to hydrogen at room temperature and form a sharp contrast with Pt-doped TiO 2 nanoceramics in this study.…”

Section: Figmentioning

confidence: 63%

Gas sensing capabilities of TiO2 porous nanoceramics prepared through premature sintering

et al. 2015

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Pure and noble metal (Pt, Pd, and Au) doped TiO 2 nanoceramics have been prepared from TiO 2 nanoparticles through traditional pressing and sintering. For those samples sintered at 550 ℃, a typical premature sintering occurred, which led to the formation of a highly porous microstructure with a Brunauer-Emmett-Teller (BET) specific surface area of 23 m 2 /g. At room temperature, only Pt-doped samples showed obvious response to hydrogen, with sensitivities as high as ~500 for 1000 ppm H 2 in N 2 ; at 300 ℃, all samples showed obvious responses to CO, while the responses of noble metal doped samples were much higher than that of the undoped ones. The mechanism for the observed sensing capabilities has been discussed, in which the catalytic effect of Pt for hydrogen is believed responsible for the room-temperature hydrogen sensing capabilities, and the absence of glass frit as commonly used in commercial thick-film metal oxide gas sensors is related to the high sensitivities. It is proposed that much attention should be paid to metal oxide porous nanoceramics in developing gas sensors with high sensitivities and low working temperatures.

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Ultra-sensitive hydrogen gas sensors based on Pd-decorated tin dioxide nanostructures: Room temperature operating sensors

Cited by 108 publications

References 21 publications

Investigation of the H2S poisoning process for sensing composite material based on carbon nanotubes and metal oxides

Investigation of the H2S poisoning process for sensing composite material based on carbon nanotubes and metal oxides

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Gas sensing capabilities of TiO2 porous nanoceramics prepared through premature sintering

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