Piezoresistive Ni:a-C:H thin films containing hcp-Ni or Ni3C investigated by XRD, EXAFS, and wavelet analysis

Uhlig, Steffen; Struis, Rudolf Paul Wilhelm Jozef; Schmid-Engel, Hanna; Bock, Jochen; Probst, Anne-Catherine; Freitag-Weber, Olivia; Zizak, Ivo; Chernikov, Roman; Schultes, Günter

doi:10.1016/j.diamond.2013.01.013

Cited by 24 publications

(22 citation statements)

References 18 publications

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“…61 Group (b) spacings could be assigned either to rh-Ni 3 C or to fcc-Ni. According to these findings, previous own work, and the literature on this material system, the initial Ni-rich phase of NCT type I is assigned to rh-Ni 3 C. 57,[62][63][64] The cross-sectional TEM image of NCT type II (Fig. 1d) shows the formation of a Ni-enriched layer appearing darker than the SiO 2 substrate and the resin glue on top of the film, which is used for TEM specimen preparation.…”

Section: Resultssupporting

confidence: 61%

Carbon : nickel nanocomposite templates – predefined stable catalysts for diameter-controlled growth of single-walled carbon nanotubes

et al. 2016

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Carbon : nickel (C : Ni) nanocomposite templates (NCTs) were used as catalyst precursors for diameter-controlled growth of single-walled carbon nanotubes (SWCNTs) by chemical vapor deposition (CVD). Two NCT types of 2 nm thickness were prepared by ion beam co-sputtering without (type I) or with assisting Ar(+) ion irradiation (type II). NCT type I comprised Ni-rich nanoparticles (NPs) with defined diameter in an amorphous carbon matrix, while NCT type II was a homogenous C : Ni film. Based on the Raman spectra of more than 600 individual SWCNTs, the diameter distribution obtained from both types of NCT was determined. SWCNTs with a selective, monomodal diameter distribution are obtained from NCT type I. About 50% of the SWCNTs have a diameter of (1.36 ± 0.10) nm. In contrast to NCT type I, SWCNTs with a non-selective, relatively homogeneous diameter distribution from 0.80 to 1.40 nm covering 88% of all SWCNTs are obtained from NCT type II. From both catalyst templates predominantly separated as-grown SWCNTs are obtained. They are free of solvents or surfactants, exhibit a low degree of bundling and contain negligible amounts of MWCNTs. The study demonstrates the advantage of predefined catalysts for diameter-controlled SWCNT synthesis in comparison to in situ formed catalysts.

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Section: Resultssupporting

confidence: 61%

Carbon : nickel nanocomposite templates – predefined stable catalysts for diameter-controlled growth of single-walled carbon nanotubes

et al. 2016

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“…However, some researchers suspected that the nanoparticles were contaminated by carbon and formed a structure similar to metastable Ni 3 C, in which the Ni arrangement is the same as that in hcp-Ni 12 13 . This ambiguity arose because it is difficult to distinguish hcp-Ni from Ni 3 C by X-ray diffraction (XRD) and normal extended X-ray absorption fine structure experiments 14 . Furthermore, the magnetism of hcp-Ni is still debated.…”

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confidence: 99%

61Ni synchrotron radiation-based Mössbauer spectroscopy of nickel-based nanoparticles with hexagonal structure

Masuda

Kobayashi

Kitao

et al. 2016

Sci Rep

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We measured the synchrotron-radiation (SR)-based Mössbauer spectra of Ni-based nanoparticles with a hexagonal structure that were synthesised by chemical reduction. To obtain Mössbauer spectra of the nanoparticles without 61Ni enrichment, we developed a measurement system for 61Ni SR-based Mössbauer absorption spectroscopy without X-ray windows between the 61Ni84V16 standard energy alloy and detector. The counting rate of the 61Ni nuclear resonant scattering in the system was enhanced by the detection of internal conversion electrons and the close proximity between the energy standard and the detector. The spectrum measured at 4 K revealed the internal magnetic field of the nanoparticles was 3.4 ± 0.9 T, corresponding to a Ni atomic magnetic moment of 0.3 Bohr magneton. This differs from the value of Ni3C and the theoretically predicted value of hexagonal-close-packed (hcp)-Ni and suggested the nanoparticle possessed intermediate carbon content between hcp-Ni and Ni3C of approximately 10 atomic % of Ni. The improved 61Ni Mössbauer absorption measurement system is also applicable to various Ni materials without 61Ni enrichment, such as Ni hydride nanoparticles.

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“…However structure of DLC films containing metal usually is more complex. Particularly In addition, metal clusters can contain carbides, as it was reported for DLC containing W [47], Cr [18], Ni [25,48]. Besides that metal nanoclusters embedded into the DLC nanocomposite films can be coated by interlayer having structure and/or composition different from the both metal nanocluster and DLC matrix.…”

Section: Accepted Manuscriptmentioning

confidence: 88%

Piezoresistive properties of diamond like carbon films containing copper

Meškinis

Gudaitis

Vasiliauskas

et al. 2015

Diamond and Related Materials

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Piezoresistive Ni:a-C:H thin films containing hcp-Ni or Ni3C investigated by XRD, EXAFS, and wavelet analysis

Cited by 24 publications

References 18 publications

Carbon : nickel nanocomposite templates – predefined stable catalysts for diameter-controlled growth of single-walled carbon nanotubes

Carbon : nickel nanocomposite templates – predefined stable catalysts for diameter-controlled growth of single-walled carbon nanotubes

61Ni synchrotron radiation-based Mössbauer spectroscopy of nickel-based nanoparticles with hexagonal structure

Piezoresistive properties of diamond like carbon films containing copper

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