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Hydrogen sensors based on electrophoretically deposited Pd nanoparticles onto InP.

Grym J, Procházková O, Yatskiv R, Piksová K - Nanoscale Res Lett (2011)

Bottom Line: Electrophoretic deposition of palladium nanoparticles prepared by the reverse micelle technique onto InP substrates is addressed.Schottky diodes based on these films show notably high values of the barrier height and of the rectification ratio giving evidence of a small degree of the Fermi level pinning.Moreover, electrical characteristics of these diodes are exceptionally sensitive to the exposure to gas mixtures with small hydrogen content.

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Affiliation: Institute of Photonics and Electronics, Academy of Sciences CR, v,v,i,, Prague 8, Czech Republic. grym@ufe.cz.

ABSTRACT
Electrophoretic deposition of palladium nanoparticles prepared by the reverse micelle technique onto InP substrates is addressed. We demonstrate that the substrate pre-deposition treatment and the deposition conditions can extensively influence the morphology of the deposited palladium nanoparticle films. Schottky diodes based on these films show notably high values of the barrier height and of the rectification ratio giving evidence of a small degree of the Fermi level pinning. Moreover, electrical characteristics of these diodes are exceptionally sensitive to the exposure to gas mixtures with small hydrogen content.

No MeSH data available.


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Current-voltage characteristics of the diodes made on samples from Table 1. The influence of the surface coverage on the forward and reverse characteristics is depicted.
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Figure 4: Current-voltage characteristics of the diodes made on samples from Table 1. The influence of the surface coverage on the forward and reverse characteristics is depicted.

Mentions: The second set included samples that are summarized in Table 1. Their I-V curves are shown in Figure 4. All samples were prepared on methanol-treated substrates at 100 V and tested for low percentage H2/N2 mixture of 0.1%. The deposition time was varied to change the surface coverage. All the investigated parameters reach its optimum values when the surface is partly covered by individual Pd NPs (1-hour deposition in Figure 1c). An outstanding value of the sensing response of 4.8 × 105 was achieved. This value is at least by two orders of magnitude higher than for any other Schottky diode-based sensor on III-V semiconductors. When shorter deposition times below 30 min are applied, the sensing response quickly decreases. Longer deposition times and full surface coverage bring results similar to those published by other groups for 0.1% H2/N2 mixtures [11,12].


Hydrogen sensors based on electrophoretically deposited Pd nanoparticles onto InP.

Grym J, Procházková O, Yatskiv R, Piksová K - Nanoscale Res Lett (2011)

Current-voltage characteristics of the diodes made on samples from Table 1. The influence of the surface coverage on the forward and reverse characteristics is depicted.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211486&req=5

Figure 4: Current-voltage characteristics of the diodes made on samples from Table 1. The influence of the surface coverage on the forward and reverse characteristics is depicted.
Mentions: The second set included samples that are summarized in Table 1. Their I-V curves are shown in Figure 4. All samples were prepared on methanol-treated substrates at 100 V and tested for low percentage H2/N2 mixture of 0.1%. The deposition time was varied to change the surface coverage. All the investigated parameters reach its optimum values when the surface is partly covered by individual Pd NPs (1-hour deposition in Figure 1c). An outstanding value of the sensing response of 4.8 × 105 was achieved. This value is at least by two orders of magnitude higher than for any other Schottky diode-based sensor on III-V semiconductors. When shorter deposition times below 30 min are applied, the sensing response quickly decreases. Longer deposition times and full surface coverage bring results similar to those published by other groups for 0.1% H2/N2 mixtures [11,12].

Bottom Line: Electrophoretic deposition of palladium nanoparticles prepared by the reverse micelle technique onto InP substrates is addressed.Schottky diodes based on these films show notably high values of the barrier height and of the rectification ratio giving evidence of a small degree of the Fermi level pinning.Moreover, electrical characteristics of these diodes are exceptionally sensitive to the exposure to gas mixtures with small hydrogen content.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Photonics and Electronics, Academy of Sciences CR, v,v,i,, Prague 8, Czech Republic. grym@ufe.cz.

ABSTRACT
Electrophoretic deposition of palladium nanoparticles prepared by the reverse micelle technique onto InP substrates is addressed. We demonstrate that the substrate pre-deposition treatment and the deposition conditions can extensively influence the morphology of the deposited palladium nanoparticle films. Schottky diodes based on these films show notably high values of the barrier height and of the rectification ratio giving evidence of a small degree of the Fermi level pinning. Moreover, electrical characteristics of these diodes are exceptionally sensitive to the exposure to gas mixtures with small hydrogen content.

No MeSH data available.


Related in: MedlinePlus