In the present study, Ag nanoparticles were synthesized in amorphous hydrogenated carbon films on glass substrates by RF-PECVD and RF-sputtering co-deposition method at the room temperature. Methyl orange was utilized as an analyte with different concentrations on Ag nanoparticles that were embedded in diamond-like carbon (DLC). Ultraviolet-visible (Uv-vis) spectroscopy, XRD analysis, Raman spectroscopy, Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscopy (FESEM) were performed to characterize films. Ag-DLC with an average size of less than 14 nm was the active site for surface-enhanced Raman scattering (SERS). Sensitivity of measurements in SERS spectra was increased by these types of thin films. This method of nano-particle synthesis is cost-effective and just requires a one-step synthesis. Such substrates can be used for several times. Moreover, they are useful for biosensors because of their hardness and other properties that may be subsequently referred.

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Co-depositing of nickel (Ni) and nitrogen (N2) in the diamond-like carbon (DLC) matrix was synthesized by pulsed laser deposition (PLD) technique. In the work presented here, N2 was injected as a reactive gas to optimize the optical, and structural properties of Ni:N-DLC thin films, although N2 to argon (Ar) gas ratio was kept constant. Statistical properties of thin films were calculated from the surface topographic images of 2Ni:N-DLC, 3Ni:N-DLC, and 4Ni-N-DLC samples. The characterization of samples have been carried out by by atomic force microscopy (AFM), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible spectroscopy. Band gap energies of 2Ni:N-DLC, 3Ni:N-DLC and 4Ni:N-DLC have been illustrated that the background N2 gas can be used for optimization of the electrical properties of Ni-DLC thin films.

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