Investigation of relaxation of nanodiamond surface in real and reciprocal spaces

B. Palosz; C. Pantea; E. Grzanka; S. Stelmakh; Th Proffen; T. W. Zerda; W. Palosz

doi:10.1016/j.diamond.2006.09.001

Investigation of relaxation of nanodiamond surface in real and reciprocal spaces

B. Palosz, C. Pantea, E. Grzanka, S. Stelmakh, Th Proffen, T. W. Zerda, W. Palosz

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

66 Scopus citations

Abstract

The structure of a nanodiamond powder with an average grain size of 5 nm was investigated using large-Q neutron diffraction. Both Bragg scattering and PDF analysis were employed. The effect of annealing under vacuum at temperatures up to 1200 °C was studied. The studies lead to a tentative model of nanocrystalline diamond, where the core with a perfect diamond lattice is surrounded by a shell of compressed diamond lattice, and this core-shell structure is enveloped in a non-diamond carbon. The non-diamond envelope of nanograins, a "gas-like" carbon, is stable up to 1000 °C and transforms into a graphite phase (an onion-type structure) at about 1200 °C. The amount of non-crystalline carbon in the powder annealed below 1000 °C is about 10%. In the sample annealed at 1200 °C a graphite-type carbon, with a total of about 15% of sp² bonds is formed.

Original language	English
Pages (from-to)	1813-1817
Number of pages	5
Journal	Diamond and Related Materials
Volume	15
Issue number	11-12 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.diamond.2006.09.001
State	Published - Nov 2006
Externally published	Yes

Funding

This work has benefited from the use of NPDF at the Lujan Center at Los Alamos Neutron Science Center, funded by DOE Office of Basic Energy Sciences and Los Alamos National Laboratory (contract W-7405-ENG-36). The upgrade of NPDF has been funded by NSF through grant DMR 00-76488. Support of this work by NSF (grant NSF DMR 0502136) is gratefully acknowledged. The authors acknowledge the support by the Polish Ministry of Education and Science (grant 3T08A 02029).

Funders	Funder number
DOE Office of Basic Energy Sciences and Los Alamos National Laboratory	W-7405-ENG-36, DMR 00-76488, NSF DMR 0502136
Ministerstwo Edukacji i Nauki	3T08A 02029

Keywords

Diamond
Nanocrystals
Structure
neutron diffraction

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10.1016/j.diamond.2006.09.001

Cite this

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abstract = "The structure of a nanodiamond powder with an average grain size of 5 nm was investigated using large-Q neutron diffraction. Both Bragg scattering and PDF analysis were employed. The effect of annealing under vacuum at temperatures up to 1200 °C was studied. The studies lead to a tentative model of nanocrystalline diamond, where the core with a perfect diamond lattice is surrounded by a shell of compressed diamond lattice, and this core-shell structure is enveloped in a non-diamond carbon. The non-diamond envelope of nanograins, a {"}gas-like{"} carbon, is stable up to 1000 °C and transforms into a graphite phase (an onion-type structure) at about 1200 °C. The amount of non-crystalline carbon in the powder annealed below 1000 °C is about 10%. In the sample annealed at 1200 °C a graphite-type carbon, with a total of about 15% of sp2 bonds is formed.",

keywords = "Diamond, Nanocrystals, Structure, neutron diffraction",

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year = "2006",

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T1 - Investigation of relaxation of nanodiamond surface in real and reciprocal spaces

AU - Palosz, B.

AU - Pantea, C.

AU - Grzanka, E.

AU - Stelmakh, S.

AU - Proffen, Th

AU - Zerda, T. W.

AU - Palosz, W.

PY - 2006/11

Y1 - 2006/11

N2 - The structure of a nanodiamond powder with an average grain size of 5 nm was investigated using large-Q neutron diffraction. Both Bragg scattering and PDF analysis were employed. The effect of annealing under vacuum at temperatures up to 1200 °C was studied. The studies lead to a tentative model of nanocrystalline diamond, where the core with a perfect diamond lattice is surrounded by a shell of compressed diamond lattice, and this core-shell structure is enveloped in a non-diamond carbon. The non-diamond envelope of nanograins, a "gas-like" carbon, is stable up to 1000 °C and transforms into a graphite phase (an onion-type structure) at about 1200 °C. The amount of non-crystalline carbon in the powder annealed below 1000 °C is about 10%. In the sample annealed at 1200 °C a graphite-type carbon, with a total of about 15% of sp2 bonds is formed.

AB - The structure of a nanodiamond powder with an average grain size of 5 nm was investigated using large-Q neutron diffraction. Both Bragg scattering and PDF analysis were employed. The effect of annealing under vacuum at temperatures up to 1200 °C was studied. The studies lead to a tentative model of nanocrystalline diamond, where the core with a perfect diamond lattice is surrounded by a shell of compressed diamond lattice, and this core-shell structure is enveloped in a non-diamond carbon. The non-diamond envelope of nanograins, a "gas-like" carbon, is stable up to 1000 °C and transforms into a graphite phase (an onion-type structure) at about 1200 °C. The amount of non-crystalline carbon in the powder annealed below 1000 °C is about 10%. In the sample annealed at 1200 °C a graphite-type carbon, with a total of about 15% of sp2 bonds is formed.

KW - Diamond

KW - Nanocrystals

KW - Structure

KW - neutron diffraction

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U2 - 10.1016/j.diamond.2006.09.001

DO - 10.1016/j.diamond.2006.09.001

M3 - Article

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SN - 0925-9635

VL - 15

SP - 1813

EP - 1817

JO - Diamond and Related Materials

JF - Diamond and Related Materials

IS - 11-12 SPEC. ISS.

ER -

Investigation of relaxation of nanodiamond surface in real and reciprocal spaces

Abstract

Funding

Keywords

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