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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 transient characteristics of the diodes made on samples from Table 1, which were exposed to 0.1% H2/N2 mixture. The influence of the surface coverage on the current of the diode which was reverse biased with the voltage of 0.1 V is shown.
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Figure 5: Current transient characteristics of the diodes made on samples from Table 1, which were exposed to 0.1% H2/N2 mixture. The influence of the surface coverage on the current of the diode which was reverse biased with the voltage of 0.1 V is shown.

Mentions: The mechanism of the detection is not discussed in detail and can be shortly described as follows. The hydrogen molecules are absorbed and dissociated at Pd surface; atomic hydrogen rapidly diffuses to the Pd/InP interface, where the dipole layer develops. Subsequently, the Schottky barrier height decreases and the electric current increases [12] (Figure 5).


Hydrogen sensors based on electrophoretically deposited Pd nanoparticles onto InP.

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

Current transient characteristics of the diodes made on samples from Table 1, which were exposed to 0.1% H2/N2 mixture. The influence of the surface coverage on the current of the diode which was reverse biased with the voltage of 0.1 V is shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Current transient characteristics of the diodes made on samples from Table 1, which were exposed to 0.1% H2/N2 mixture. The influence of the surface coverage on the current of the diode which was reverse biased with the voltage of 0.1 V is shown.
Mentions: The mechanism of the detection is not discussed in detail and can be shortly described as follows. The hydrogen molecules are absorbed and dissociated at Pd surface; atomic hydrogen rapidly diffuses to the Pd/InP interface, where the dipole layer develops. Subsequently, the Schottky barrier height decreases and the electric current increases [12] (Figure 5).

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