Direct observation and mechanism of increased emission sites in Fe-coated microcrystalline diamond films

Kalpataru Panda; B. Sundaravel; B. K. Panigrahi; Pin Chang Huang; Wen Ching Shih; Huang Chin Chen; I. Nan Lin

doi:10.1063/1.4729836

Direct observation and mechanism of increased emission sites in Fe-coated microcrystalline diamond films

Kalpataru Panda^*
, B. Sundaravel
, B. K. Panigrahi
, Pin Chang Huang
, Wen Ching Shih
, Huang Chin Chen
, I. Nan Lin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The electron field emission (EFE) properties of microcrystalline diamond (MCD) films are significantly enhanced due to the Fe coating and post-annealing processes. The 900°C post-annealed Fe coated diamond films exhibit the best EFE properties, with a turn on field (E ₀) of 3.42 V/m and attain EFE current density (J _e) of 170 μA/cm ² at 7.5 V/m. Scanning tunnelling spectroscopy (STS) in current imaging tunnelling spectroscopy mode clearly shows the increased number density of emission sites in Fe-coated and post-annealed MCD films than the as-prepared ones. Emission is seen from the boundaries of the Fe (or Fe ₃C) nanoparticles formed during the annealing process. In STS measurement, the normalized conductance dI/dV/ I/V versus V curves indicate nearly metallic band gap, at the boundaries of Fe (or Fe ₃C) nanoparticles. Microstructural analysis indicates that the mechanism for improved EFE properties is due to the formation of nanographite that surrounds the Fe (or Fe ₃C) nanoparticles.

Original language	English
Article number	124309
Journal	Journal of Applied Physics
Volume	111
Issue number	12
DOIs	https://doi.org/10.1063/1.4729836
Publication status	Published - 15-06-2012

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1063/1.4729836

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@article{80ae71cb803e443e8da849a48fbd04f5,

title = "Direct observation and mechanism of increased emission sites in Fe-coated microcrystalline diamond films",

abstract = "The electron field emission (EFE) properties of microcrystalline diamond (MCD) films are significantly enhanced due to the Fe coating and post-annealing processes. The 900°C post-annealed Fe coated diamond films exhibit the best EFE properties, with a turn on field (E 0) of 3.42 V/m and attain EFE current density (J e) of 170 μA/cm 2 at 7.5 V/m. Scanning tunnelling spectroscopy (STS) in current imaging tunnelling spectroscopy mode clearly shows the increased number density of emission sites in Fe-coated and post-annealed MCD films than the as-prepared ones. Emission is seen from the boundaries of the Fe (or Fe 3C) nanoparticles formed during the annealing process. In STS measurement, the normalized conductance dI/dV/ I/V versus V curves indicate nearly metallic band gap, at the boundaries of Fe (or Fe 3C) nanoparticles. Microstructural analysis indicates that the mechanism for improved EFE properties is due to the formation of nanographite that surrounds the Fe (or Fe 3C) nanoparticles.",

author = "Kalpataru Panda and B. Sundaravel and Panigrahi, \{B. K.\} and Huang, \{Pin Chang\} and Shih, \{Wen Ching\} and Chen, \{Huang Chin\} and Lin, \{I. Nan\}",

year = "2012",

month = jun,

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doi = "10.1063/1.4729836",

language = "English",

volume = "111",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

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T1 - Direct observation and mechanism of increased emission sites in Fe-coated microcrystalline diamond films

AU - Panda, Kalpataru

AU - Sundaravel, B.

AU - Panigrahi, B. K.

AU - Huang, Pin Chang

AU - Shih, Wen Ching

AU - Chen, Huang Chin

AU - Lin, I. Nan

PY - 2012/6/15

Y1 - 2012/6/15

N2 - The electron field emission (EFE) properties of microcrystalline diamond (MCD) films are significantly enhanced due to the Fe coating and post-annealing processes. The 900°C post-annealed Fe coated diamond films exhibit the best EFE properties, with a turn on field (E 0) of 3.42 V/m and attain EFE current density (J e) of 170 μA/cm 2 at 7.5 V/m. Scanning tunnelling spectroscopy (STS) in current imaging tunnelling spectroscopy mode clearly shows the increased number density of emission sites in Fe-coated and post-annealed MCD films than the as-prepared ones. Emission is seen from the boundaries of the Fe (or Fe 3C) nanoparticles formed during the annealing process. In STS measurement, the normalized conductance dI/dV/ I/V versus V curves indicate nearly metallic band gap, at the boundaries of Fe (or Fe 3C) nanoparticles. Microstructural analysis indicates that the mechanism for improved EFE properties is due to the formation of nanographite that surrounds the Fe (or Fe 3C) nanoparticles.

AB - The electron field emission (EFE) properties of microcrystalline diamond (MCD) films are significantly enhanced due to the Fe coating and post-annealing processes. The 900°C post-annealed Fe coated diamond films exhibit the best EFE properties, with a turn on field (E 0) of 3.42 V/m and attain EFE current density (J e) of 170 μA/cm 2 at 7.5 V/m. Scanning tunnelling spectroscopy (STS) in current imaging tunnelling spectroscopy mode clearly shows the increased number density of emission sites in Fe-coated and post-annealed MCD films than the as-prepared ones. Emission is seen from the boundaries of the Fe (or Fe 3C) nanoparticles formed during the annealing process. In STS measurement, the normalized conductance dI/dV/ I/V versus V curves indicate nearly metallic band gap, at the boundaries of Fe (or Fe 3C) nanoparticles. Microstructural analysis indicates that the mechanism for improved EFE properties is due to the formation of nanographite that surrounds the Fe (or Fe 3C) nanoparticles.

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VL - 111

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 12

M1 - 124309

ER -

Direct observation and mechanism of increased emission sites in Fe-coated microcrystalline diamond films

Abstract

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