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Copper nanoparticles encapsulated in multi-shell carbon cages

Title data

Schaper, Andreas ; Hou, Haoqing ; Greiner, Andreas ; Schneider, R. ; Phillipp, Fritz:
Copper nanoparticles encapsulated in multi-shell carbon cages.
In: Applied Physics A. Vol. 78 (January 2004) Issue 1 . - pp. 73-77.
ISSN 1432-0630
DOI: https://doi.org/10.1007/s00339-003-2199-0

Official URL: Volltext

Abstract in another language

Nanoparticles are attracting increasing interest because of their high potential for a great number of practical applications, such as optical and electronic devices, nanoscale storage, and delivery systems. Using Cu-phthalocyanine as precursor material, we have synthesized multi-shell graphitic carbon nanospheres without and with metal encapsulation, depending on the pyrolysis conditions. The encapsulated elemental copper nanocrystals achieved using that route were of the order of 50 nm in size. The particles were characterized in detail by high-resolution transmission electron microscopy (HRTEM) and by energy filtering microscopy (EFTEM). The concentric graphitic carbon shells of the as-grown particles were clearly discernable. After in situ high-temperature annealing, an increase in the degree of order was observed. Under high-voltage electron irradiation and heating, a melting point reduction of the enclosed nanosized copper of more than 200 K could be detected, as compared to the melting point 1083degreesC of bulk copper. Time-resolved imaging revealed the displacement of the melting copper by migration through the carbon shells, leaving intact carbon cages with a central hole. At intermediate stages of this process the transformation into a hexagonal morphology of the copper nanocrystals was observed.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: MAGNETIC-PROPERTIES; ELECTRON-MICROSCOPY; METAL ATOMS; ARC METHOD; PARTICLES; SPHERES; NANOTUBES; CARBIDE; ONIONS; NANOCLUSTERS
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 14 Apr 2015 08:09
Last Modified: 14 Apr 2015 08:09
URI: https://eref.uni-bayreuth.de/id/eprint/9734