A low temperature hydrogen sensor based on palladium nanoparticles

Gupta, D.; Dutta, Debasmita; Kumar, Manoj; Barman, P. B.; Sarkar, Chandan Kumar; Basu, S.; Hazra, Surajit Kumar

doi:10.1016/j.snb.2014.01.106

Cited by 85 publications

(58 citation statements)

References 43 publications

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“…Figure 6 presents the percentage response, the calculated response time for 90% change in signal upon exposure to hydrogen mixed with air, and the corresponding recovery time for reversal of the signal by 90% after the hydrogen supply was cut off. 16,25 A very fast (1 s to 2 s) response, high response magnitude, and fast recovery were found at 150°C (Fig. 6), where graphene showed p-type conductivity.…”

Section: Response Characteristics In Air and Hydrogen Mixed With Airmentioning

confidence: 95%

Temperature- and Hydrogen-Gas-Dependent Reversible Inversion of n-/p-Type Conductivity in CVD-Grown Multilayer Graphene (MLG) Film

Dutta

Hazra

Das

et al. 2016

Journal of Elec Materi

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In atmospheric-pressure chemical vapor deposition-grown multilayer graphene films, a reversible change from n-to p-type conductivity has been observed in the temperature range of 25°C to 150°C upon exposure to hydrogen. This study was conducted with a simple Pd/graphene/Pd planar device. The inversion was observed at around 100°C, below which it showed stable n-type response to hydrogen. The hydrogen response was quite fast (1 s to 2 s) at 150°C. A plausible mechanism has been developed to explain such inversion. The selectivity and stability of the device in both n-and p-regions were investigated in the temperature range of 25°C to 150°C.

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Section: Response Characteristics In Air and Hydrogen Mixed With Airmentioning

confidence: 95%

Temperature- and Hydrogen-Gas-Dependent Reversible Inversion of n-/p-Type Conductivity in CVD-Grown Multilayer Graphene (MLG) Film

Dutta

Hazra

Das

et al. 2016

Journal of Elec Materi

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“…Representative real-time sensing response to H 2 concentrations from 50 ppm to 2000 ppm in air at room temperature is shown in Figure 3. A stable baseline was obtained by flowing dry air for 5 h prior to H 2 exposure, however during sensing analysis a significant downward drift in baseline resistance was detected which grew to nearly 32% within 6 h. A similar slow decline in resistance has been recognized in H 2 sensors based on individual electrodeposited Pd nanowires 1 and Pd nanoparticles 5 . In these sensors, the decrease in baseline resistance was attributed to removal of oxygen species from the Pd surface.…”

Section: Sensor Analysis Of Pd Nanocrystalline Nanowiresmentioning

confidence: 55%

“…Particularly, nanostructured Pd is of interest due to its high surface-to-volume ratio. Various nanomaterials from nanowires 1-3 to nanotubes 4 to nanoparticles 5 have demonstrated effective H 2 sensing. Upon contact with Pd, H 2 gas adsorbs and dissociates to form H atoms, which then diffuse into the interstitial sites of Pd to form alpha-phase palladium hydride (α-PdH x ) 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Viral-templated nanocrystalline Pd nanowires for chemiresistive hydrogen (H₂) sensors

et al. 2014

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A palladium (Pd) nanowire-based hydrogen (H 2 ) sensor has been fabricated with a novel viral-templated assembly route. A filamentous M13 bacteriophage was used as the viral-template for assembly of Pd nanowires at ambient conditions. Scanning electron microscopy determined Pd nanowire distribution and morphology with the devices. The phage template concentration controlled the number of physical and electrical nanowire connections across the device. A greater phage concentration resulted in a higher connection density and thicker Pd deposition. A lower phage concentration generated devices which formed chain-like nanowires of Pd nanocrystals, whereas a higher phage concentration formed devices with a continuous mesh-like structure. The lower concentration devices showed 51-78% instantaneous response to 2000 ppm H 2 and response time less than 30 s.

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“…However, for nanoscale structures, the hydrogen sensing mechanism can differ. Due to the described lattice expansion, interconnections between nanostructures (e.g., Pd‐nanowires and ‐particles) are formed and intensified leading to a decrease of the film resistance, which can be used as well for hydrogen quantification .…”

Section: Introductionmentioning

confidence: 99%

Palladium thin films for hydrogen sensing in aqueous electrolytes

Walkner

Schimo

Mardare

et al. 2015

Physica Status Solidi (a)

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In this work, differently prepared palladium films are tested toward their hydrogen sensing properties in aqueous electrolytes. The Pd thin films were either electroless deposited, electrochemically deposited, or prepared by physical vapor deposition. The outcome of each fabrication process and characteristics of the Pd films were determined by means of SEM and cyclic voltammetry. Electrochemical impedance spectroscopy was performed in order to calibrate the prepared hydrogen sensors. The Pd films react on different hydrogen concentrations in the electrolyte by changing their electrical resistivity. Elemental hydrogen can diffuse into the Pd film leading to a lattice expansion and a phase transition. A second hydrogen sensing mechanism due to a change in charge transfer resistance can be observed.

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A low temperature hydrogen sensor based on palladium nanoparticles

Cited by 85 publications

References 43 publications

Temperature- and Hydrogen-Gas-Dependent Reversible Inversion of n-/p-Type Conductivity in CVD-Grown Multilayer Graphene (MLG) Film

Temperature- and Hydrogen-Gas-Dependent Reversible Inversion of n-/p-Type Conductivity in CVD-Grown Multilayer Graphene (MLG) Film

Viral-templated nanocrystalline Pd nanowires for chemiresistive hydrogen (H₂) sensors

Palladium thin films for hydrogen sensing in aqueous electrolytes

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A low temperature hydrogen sensor based on palladium nanoparticles

Cited by 85 publications

References 43 publications

Temperature- and Hydrogen-Gas-Dependent Reversible Inversion of n-/p-Type Conductivity in CVD-Grown Multilayer Graphene (MLG) Film

Temperature- and Hydrogen-Gas-Dependent Reversible Inversion of n-/p-Type Conductivity in CVD-Grown Multilayer Graphene (MLG) Film

Viral-templated nanocrystalline Pd nanowires for chemiresistive hydrogen (H2) sensors

Palladium thin films for hydrogen sensing in aqueous electrolytes

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Product

Resources

About

Viral-templated nanocrystalline Pd nanowires for chemiresistive hydrogen (H₂) sensors