High permittivity from defective carbon-coated Cu nanocapsules
Creators
- 1. State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams and School of Materials Science and Engineering, Dalian University of Technology, Dalian, Liaoning 116024 (China)
Description
Carbon-coated Cu [Cu(C)] nanocapsules were prepared by a DC arc discharge method in a methane (CH4) atmosphere, and characterized by x-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning differential thermal analysis (SDTA), transmission electron microscopy (TEM) and Raman spectroscopy. The results show that the as-made product consists of carbon-coated Cu nanocapsules and giant onion-like fullerenes (GOLFs) in the diameter range of 20-50 nm. The graphite outer shells effectively protect the Cu cores from environmental oxidation, and have a greater defect density in comparison with bulk graphite and carbon nanotubes (CNTs). Its relatively complex permittivity (εr = ε'+iε'') is also measured at 2-18 GHz. The values of ε' and ε'' reach 14.5 and 4.1, respectively, exhibiting excellent electromagnetic wave loss ability
Additional details
Identifiers
- DOI
- 10.1088/0957-4484/18/27/275701;
- PII
- S0957-4484(07)46460-1;
Publishing Information
- Journal Title
- Nanotechnology (Print)
- Journal Volume
- 18
- Journal Issue
- 27
- Journal Page Range
- p. 275701
- ISSN
- 0957-4484
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 38088831
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- COMPARATIVE EVALUATIONS; DENSITY; DIFFERENTIAL THERMAL ANALYSIS; ELECTROMAGNETIC RADIATION; FULLERENES; GHZ RANGE; GRAPHITE; METHANE; NANOTUBES; OXIDATION; PERMITTIVITY; POINT DEFECTS; RAMAN SPECTROSCOPY; THERMAL GRAVIMETRIC ANALYSIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION
- Descriptors DEC
- ALKANES; CARBON; CHEMICAL ANALYSIS; CHEMICAL REACTIONS; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DIELECTRIC PROPERTIES; DIFFRACTION; ELECTRICAL PROPERTIES; ELECTRON MICROSCOPY; ELEMENTS; EVALUATION; FREQUENCY RANGE; GRAVIMETRIC ANALYSIS; HYDROCARBONS; LASER SPECTROSCOPY; MICROSCOPY; MINERALS; NANOSTRUCTURES; NONMETALS; ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; QUANTITATIVE CHEMICAL ANALYSIS; RADIATIONS; SCATTERING; SPECTROSCOPY; THERMAL ANALYSIS