Electrical conductivity and microstructure of metal containing a-C:H films

Benndorf, Carsten; Boettger, E.; Fryda, M.; Haubold, H.‐G.; Klages, Claus‐Peter; Köberle, Hermann

doi:10.1016/0379-6779(91)91743-t

Cited by 18 publications

(12 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is known that metal containing carbon materials consist of metal or metal carbide clusters embedded in a matrix of carbon [8]. Using appropriate metals, the temperature coefficient of resistivity (TCR) can be adjusted by the metal concentration, ranging from highly negative TCR in the pure carbon matrix to positive, metallic like TCR in metal rich composites [6].…”

Section: Introductionmentioning

confidence: 99%

Structural and physical properties of highly piezoresistive nickel containing hydrogenated carbon thin films

Koppert

Uhlig²,

Schmid-Engel³

et al. 2012

Diamond and Related Materials

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Structural and physical properties of highly piezoresistive nickel containing hydrogenated carbon thin films

Koppert

Uhlig²,

Schmid-Engel³

et al. 2012

Diamond and Related Materials

View full text Add to dashboard Cite

“…Typically, these nanocomposites consist of nanocrystalline metal carbide (nc-MeC) in an amorphous matrix of, e.g., carbon (a-C) or SiC (a-SiC). The great potential of this type of coatings is their design possibilities; the material properties of the coatings can be controlled by the microstructure (grain size and matrix thickness) and also by the choice of transition metal (Me) [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The simplicity of binary nanocomposite coatings makes them an interesting alternative to ternary nanocomposites, especially when studying the microstructure and its connection to the properties of the coating for different transition metals.…”

Section: Introductionmentioning

confidence: 99%

Structural, mechanical and electrical-contact properties of nanocrystalline-NbC/amorphous-C coatings deposited by magnetron sputtering

Nedfors

Tengstrand

Lewin

et al. 2011

Surface and Coatings Technology

118

View full text Add to dashboard Cite

Niobium-carbide nanocomposite coatings with a carbon content varying from 43 -64 at.% were deposited by dual DC magnetron sputtering. X-ray diffraction, x-ray photoelectron spectroscopy and electron microscopy showed that all coatings consisted of nanometer sized NbC grains embedded in a matrix of amorphous carbon. Mechanical properties and electrical resistivity showed a strong dependency on the amount of amorphous carbon (a-C) and NbC grain size in the coating. The highest hardness (23 GPa), elastic modulus (295 GPa) and the lowest resistivity (260 µΩcm) were measured for the coating with about 15 % of a-C phase.Contact resistance measurements using a crossed cylinder set-up showed lowest contact resistance for the coating containing 33 % a-C (140 µΩ at a contact force of 100 N), which is comparable to a Ag reference (45 µΩ at a contact force of 100 N). Comparison with TiCbased nanocomposites studied under similar conditions showed that the Nb-C system has less tendency to form a-C and that lowest contact resistance is obtained at comparable amounts of a-C phase in both material systems (33 % for Nb-C compared to 35 % for Ti-C). With these good electrical contact properties, the Nb-C nanocomposites can be considered as a potential material for electrical contact applications.

show abstract

“…By tuning the TiC grain size and fraction of a-C matrix, the properties can be controlled as the matrix phase increases the toughness of the material and softens the nanocomposite compared to pure carbides but also provides a source of solid lubricant. [2][3][4][5][6][7][8] The nc-TiC has a NaCl crystal structure and its bonding is a mixture of covalent, ionic and metallic bonds where the covalent contribution consists of Ti e g -C 2p ͑pd ͒, Ti t 2g -C 2p ͑pd ͒, and Ti-Ti t 2g ͑dd ͒ bonds, 9 which are all found in the valence band.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and chemical bonding of nanocrystalline-TiC/amorphous-C nanocomposites

et al. 2009

View full text Add to dashboard Cite

The electronic structure of nanocrystalline ͑nc-͒ TiC/amorphous C nanocomposites has been investigated by soft x-ray absorption and emission spectroscopy. The measured spectra at the Ti 2p and C 1s thresholds of the nanocomposites are compared to those of Ti metal and amorphous C. The corresponding intensities of the electronic states for the valence and conduction bands in the nanocomposites are shown to strongly depend on the TiC carbide grain size. An increased charge transfer between the Ti 3d-e g states and the C 2p states has been identified as the grain size decreases, causing an increased ionicity of the TiC nanocrystallites. It is suggested that the charge transfer occurs at the interface between the nanocrystalline-TiC and the amorphous-C matrix and represents an interface bonding which may be essential for the understanding of the properties of nc-TiC/amorphous C and similar nanocomposites.

show abstract

Electrical conductivity and microstructure of metal containing a-C:H films

Cited by 18 publications

References 4 publications

Structural and physical properties of highly piezoresistive nickel containing hydrogenated carbon thin films

Structural and physical properties of highly piezoresistive nickel containing hydrogenated carbon thin films

Structural, mechanical and electrical-contact properties of nanocrystalline-NbC/amorphous-C coatings deposited by magnetron sputtering

Electronic structure and chemical bonding of nanocrystalline-TiC/amorphous-C nanocomposites

Contact Info

Product

Resources

About