Conductive nanoscopic ion-tracks in diamond-like-carbon

Zollondz, J.-H.; Schwen, Daniel; Nix, Anne-Katrin; Trautmann, C.; Berthold, J.; Krauser, J.; Hofsäß, H.

doi:10.1016/j.msec.2005.09.107

Cited by 14 publications

(25 citation statements)

References 10 publications

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“…Both experiments and simulations found that swift heavy projectiles in DLC lead to extended defects and structural modifications, with the production of nanohillocks on the surface along the ion trajectory [7]. Previous studies on ion-tracks in DLC show that SHI irradiations create conducting tracks embedded in the originally insulating DLC material, due to the transformation of sp 3 to sp 2 hybridization in the tracks [8][9][10].…”

Section: Introductionmentioning

confidence: 88%

Swift heavy ion effects on DLC-nanotube-diamond thin films

Ren

Djurabekova

Nordlund

2017

J. Phys. D: Appl. Phys.

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The composites based on a mixture of carbon nanotubes and diamond-like-carbon(DLC)-CNT are of great interest due to the potential to achieve unique electronic and optical properties with enhanced mechanical wear resistance. Swift heavy ion (SHI) irradiation of such carbon nanostucture composites suggest a way to tune the material's properties via localized structural modifications. We use classical molecular dynamics simulations combined with an inelastic thermal spike model to study the mechanisms of track formation by SHI in DLC-CNT-diamond thin films. We observe a clear increase of content of atoms with sp 2 hybridization compared to the initial structure. When the system reached an equilibrium state after the energy deposition, the track was structurally expanded outwards from the most underdense core. In addition, we found that the track radii are different in different composites, with smaller track radii in pure diamond and larger radii in DLC. Sputtering occurred predominantly from the track center.

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Section: Introductionmentioning

confidence: 88%

Swift heavy ion effects on DLC-nanotube-diamond thin films

Ren

Djurabekova

Nordlund

2017

J. Phys. D: Appl. Phys.

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“…the electronic energy loss. 16 The onset of conducting track formation occurs around 20-30 keV/nm and the highest track conductivities are obtained for maximum achievable electronic energy loss of about 40 keV/nm for 1GeV 238 U ions or 72 keV/nm for 30 MeV C 60 cluster ions. 17 Until now, beside ta-C conductive ion track formation was only observed in fullerene films.…”

Section: Introductionmentioning

confidence: 93%

Tuning the conductivity of vanadium dioxide films on silicon by swift heavy ion irradiation

et al. 2011

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We demonstrate the generation of a persistent conductivity increase in vanadium dioxide thin films grown on single crystal silicon by irradiation with 1 GeV 238U swift heavy ions at room temperature. VO2 undergoes a temperature driven metal-insulator-transition (MIT) at 67 °C. After room temperature ion irradiation with high electronic energy loss of 50 keV/nm the conductivity of the films below the transition temperature is strongly increased proportional to the ion fluence of 5·109 U/cm2 and 1·1010 U/cm2. At high temperatures the conductivity decreases slightly. The ion irradiation slightly reduces the MIT temperature. This observed conductivity change is persistent and remains after heating the samples above the transition temperature and subsequent cooling. Low temperature measurements down to 15 K show no further MIT below room temperature. Although the conductivity increase after irradiation at such low fluences is due to single ion track effects, atomic force microscopy (AFM) measurements do not show surface hillocks, which are characteristic for ion tracks in other materials. Conductive AFM gives no evidence for conducting ion tracks but rather suggests the existence of conducting regions around poorly conducting ion tracks, possible due to stress generation. Another explanation of the persistent conductivity change could be the ion-induced modification of a high resistivity interface layer formed during film growth between the vanadium dioxide film and the n-Silicon substrate. The swift heavy ions may generate conducting filaments through this layer, thus increasing the effective contact area. Swift heavy ion irradiation can thus be used to tune the conductivity of VO2 films on silicon substrates

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“…The electrical conductivity of the ion tracks depends on the sp 2 to sp 3 ratio of the DLC film, as reported in Ref. 7. While the conductivity of the nanowires increases with increasing sp 2 content of the film, the current contrast between on-track and off-track measurements decreases, meaning that the deposited film itself becomes more and more conductive as the sp 3 content is lowered.…”

Section: Methodsmentioning

confidence: 63%

Ion track lithography and graphitic nanowires in diamondlike carbon

Krauser

Nix

Gehrke

et al. 2008

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Ion track lithography is well established and is based on heavy ions of several hundred MeV energy passing through a polymer film and thereby changing the material properties along the trajectory of each ion. By selective chemical track etching, small channels (down to 20–30nm diameter) are formed which can be filled with another material or can serve as mask for further etching steps. Another application uses unetched ion tracks directly for nanostructuring. The authors’ investigations showed that graphitic nanowires are formed along ion tracks in insulating diamondlike carbon films. The diameter of these conducing filaments is in the order of 8nm. In the present article the authors describe a combination of these two possibilities to create several nanodevices such as cold field emission devices, quantum-based electronics, or interconnections in very-large-scale integrated circuits. Since the lithographic structure and the conducting filament are produced by the same ion track, the two parts of the device are self-aligned and need no further adjustment. Furthermore, it should be mentioned that the structure is created by a single ion and therefore is automatically very small in diameter and does not require special beam focusing.

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Conductive nanoscopic ion-tracks in diamond-like-carbon

Cited by 14 publications

References 10 publications

Swift heavy ion effects on DLC-nanotube-diamond thin films

Swift heavy ion effects on DLC-nanotube-diamond thin films

Tuning the conductivity of vanadium dioxide films on silicon by swift heavy ion irradiation

Ion track lithography and graphitic nanowires in diamondlike carbon

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