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Production of nano-thin graphite films by CVD

This study presents the successful synthesis of nanometrically thin graphite films on nickel substrates using chemical vapor deposition (CVD) techniques. The films were created in a DC plasma-activated environment utilizing hydrogen and methane. Observations reveal that the graphene layers closely adhere to the substrate, with minimal ridging. Scanning Tunneling Microscopy (STM) confirmed an atomically smooth surface with typical hexagonal order, while Auger and Raman spectroscopy assessed the film thickness, estimated between 1-10 nm. Additionally, SEM images and detailed Raman analyses elucidate the film characteristics and growth mechanisms.

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Production of nano-thin graphite films by CVD

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  1. Production of nano-thin graphite films by CVD A.N. Obraztsov1,2 *, A.V. Tyurnina2, E.A. Obraztsova2, A.A. Zolotukhin2, K.N. Eltsov3, B.V. Andryushechkin3 1 University of Joensuu, Joensuu 801101, Finland 2 Moscow State University, Moscow 119992, Russia 3 General Physics Institute, Moscow 119991, Russia ABSTRACT Nanometrically thin graphite films were obtained on Ni substrates by chemical vapor deposition in DC plasma activated mixture of hydrogen and methane. The graphene layers in the film conformed the substrate surface except ridges of a few tens nanometers in height. The STM study shown an atomically smooth graphite surface with a typical hexagonal order in between the ridges. The supposed origin of the ridges is the difference in thermal expansion of nickel and graphite at CVD growth process. The film thickness is estimated to be in the range of 1 to 10 nm using Auger and Raman spectroscopy analysis.

  2. CVD process (carbon vapor deposition) CH4 900 – 1100 ºC

  3. SEM images of films deposited on Si (a) and Ni (b, c) substrates with identical conditions of CVD process. The image (c) obtained with sample tilt of 75°.

  4. STM images of surface of graphite film grown on Ni corresponding to atomic arrangement of ideal graphite single crystal (a) and with graphene layers stacking fault producing the moiré (b).

  5. Raman spectra of CVD films obtained on Si (curve 1) and Ni (curve 2) substrates. Spectrum 1 is presented after subtraction of PL.

  6. Schematic presentation of three stages in deposition process of graphite film on Ni substrate

  7. FCC HCP FCC HCP

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