TY - JOUR
T1 - Graphite encapsulated nanocrystals produced using a low carbon
T2 - Metal ratio
AU - Host, Jonathon J.
AU - Teng, Mao H.
AU - Elliott, Brian R.
AU - Hwang, Jin Ha
AU - Mason, Thomas O.
AU - Johnson, D. Lynn
AU - Dravid, Vinayak P.
N1 - Funding Information:
This work was supported by National Science Foundation, Grant DMR-9202574, and by the MRL Program of the National Science Foundation at the Materials Research Center of Northwestern University, under Award No. DMR-9120521. Vinayak P. Dravid was also partially supported by the National Science Foundation NYI program, Grant DMR-9357513, with matching support from the Exxon Education Foundation.
PY - 1997/5
Y1 - 1997/5
N2 - Graphite encapsulated nanocrystals produced by a low carbon tungsten arc were analyzed to determine their chemistry, crystallography, and nanostructural morphology. Metallic nanocrystals of Fe, Co, and Ni are in the face-centered cubic (fcc) phase, and no trace of the bulk equilibrium phases of body-centered cubic (Fe) and hexagonal close-packed (Co) were found. Various analytical techniques have revealed that the encased nanocrystals are pure metal (some carbide was found in the case of Fe), ferromagnetic, and generally spherical. The nanocrystals are protected by turbostratic graphite, regardless of the size of the nanocrystals. The turbostratic graphite coating is usually made up of between 2 and 10 layers. No trace of any unwanted elements (e.g., oxygen) was found. The low carbon : metal ratio arc technique is a relatively clean process for the production of graphite encapsulated nanocrystals.
AB - Graphite encapsulated nanocrystals produced by a low carbon tungsten arc were analyzed to determine their chemistry, crystallography, and nanostructural morphology. Metallic nanocrystals of Fe, Co, and Ni are in the face-centered cubic (fcc) phase, and no trace of the bulk equilibrium phases of body-centered cubic (Fe) and hexagonal close-packed (Co) were found. Various analytical techniques have revealed that the encased nanocrystals are pure metal (some carbide was found in the case of Fe), ferromagnetic, and generally spherical. The nanocrystals are protected by turbostratic graphite, regardless of the size of the nanocrystals. The turbostratic graphite coating is usually made up of between 2 and 10 layers. No trace of any unwanted elements (e.g., oxygen) was found. The low carbon : metal ratio arc technique is a relatively clean process for the production of graphite encapsulated nanocrystals.
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U2 - 10.1557/JMR.1997.0175
DO - 10.1557/JMR.1997.0175
M3 - Article
AN - SCOPUS:0031145778
VL - 12
SP - 1268
EP - 1273
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 5
ER -