Highly efficient hydrogen sensors based on Pd nanoparticles supported on boron nitride coated ZnO nanowires

Weber, Matthieu; Kim, Jin‐Young; Kim, Jae‐Hun; Iatsunskyi, Igor; Coy, Emerson; Miele, Philippe; Bechelany, Mikhaël; Kim, Sang Sub

doi:10.1039/c9ta00788a

Cited by 131 publications

(75 citation statements)

References 90 publications

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“…[15][16][17] Recently, the sensors based on ZnO nanowires decorated with Pd nanoparticles have also been reported, which obtain high selectivity and sensitivity. 18,19 The poor response and low sensing selectivity of metal-oxide gas sensors towards chlorobenzene are caused by the chemically inert molecular structure of chlorobenzene. 20 Pt and Pd nanoparticles are considered to have better sensitization activity; however, Pd is more economical than Pt.…”

Section: Introductionmentioning

confidence: 99%

Well-dispersed Pd nanoparticles on porous ZnO nanoplates via surface ion exchange for chlorobenzene-selective sensor

Feng

Gao

et al. 2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Well-dispersed Pd nanoparticles on porous ZnO nanoplates via surface ion exchange for chlorobenzene-selective sensor

Feng

Gao

et al. 2019

RSC Adv.

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“…The vacuum chamber was set at a temperature of 220 • C, and the lines were heated at 100 • C in order to prevent condensation. Further details about both this deposition protocol and the associated ALD reactor can be found elsewhere [25,26].…”

Section: Eggshell Catalystsmentioning

confidence: 99%

Impregnation Protocols on Alumina Beads for Controlling the Preparation of Supported Metal Catalysts

et al. 2019

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Whereas the synthesis principles of supported metal catalysts are well documented in the open literature, impregnation protocols on shaped bodies represent sensitive industrial know-how and are, therefore, rarely found. We investigated various synthesis parameters for both wetness (WI) and dry (DI) impregnations to prepare Pd/γ–Al2O3 alumina beads. Two kinds of catalysts were achieved: homogeneously dispersed catalysts with no metal gradient across the beads and eggshell catalysts. A combination of optical images, Castaing microprobe analysis, elemental analysis, and TEM made it possible to discriminate between catalysts according to their metal loading, location across the bead diameter, and metal dispersion. Regardless of the macropore structure of the alumina beads, we found that volatile solvents (acetone) were preferred for preparing homogeneous catalysts by WI, whereas the use of a viscous aqueous solution (water/glycerol) in DI resulted in an eggshell-type catalyst. The atomic layer deposition (ALD) method was also investigated as a physical vapor phase deposition method for preparing eggshell catalysts. Representative-shaped catalysts were tested for CO oxidation as a model reaction in order to highlight the differences between catalysts with a homogeneous metal distribution (no metal gradient) and eggshell-type.

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“…Often, they suffer from some serious drawbacks such as (a) high operation temperatures (operation at room temperature has shown weak response to low concentration H 2 or have long response-recovery time; moreover, operating at high temperatures is very risky especially when the targeted gas is an explosive gas such as H 2 ); (b) they need a pre-treatment with UV light in order to become conductive; and (c) their fabrication is complicated and expensive (e.g. rf sputtering, dc sputtering, high vacuum facilities, pulsed laser deposition [16][17][18][19][20][21]).…”

Section: Introductionmentioning

confidence: 99%

Self-powered, flexible and room temperature operated solution processed hybrid metal halide p-type sensing element for efficient hydrogen detection

et al. 2020

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Hydrogen (H 2 ) is a well-known reduction gas and for safety reasons is very important to be detected. The most common systems employed along its detection are metal oxide-based elements. However, the latter demand complex and expensive manufacturing techniques, while they also need high temperatures or UV light to operate effectively. In this work, we first report a solution processed hybrid mixed halide spin coated perovskite films (CH 3 NH 3 PbI 3−x Cl x ) that have been successfully applied as portable, flexible, self-powered, fast and sensitive hydrogen sensing elements, operating at room temperature. The minimum concentrations of H 2 gas that could be detected was down to 10 ppm. This work provides a new pathway on gases interaction with perovskite materials, poses new questions that must be addressed regarding the sensing mechanisms involved. The utilization of halide perovskite sensing elements demonstrates their potential beyond solar cell applications. OPEN ACCESS RECEIVED

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Highly efficient hydrogen sensors based on Pd nanoparticles supported on boron nitride coated ZnO nanowires

Abstract: High selectivity and sensitivity were measured using a novel type of sensor device, based on ZnO nanowires (NWs) coated with a thin layer of boron nitride (BN) decorated with palladium nanoparticles (NPs).

Cited by 131 publications

References 90 publications

Well-dispersed Pd nanoparticles on porous ZnO nanoplates via surface ion exchange for chlorobenzene-selective sensor

Well-dispersed Pd nanoparticles on porous ZnO nanoplates via surface ion exchange for chlorobenzene-selective sensor

Impregnation Protocols on Alumina Beads for Controlling the Preparation of Supported Metal Catalysts

Self-powered, flexible and room temperature operated solution processed hybrid metal halide p-type sensing element for efficient hydrogen detection

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