Nano scale investigation of particulate contribution to diamond like carbon film by pulsed laser deposition

Abstract

Raman mapping and AFAM are useful tools to evaluate the relative stiffness of DLC films embedded with micro graphitic particulates.

Tailored Hydrogen-Free Carbon Films by Tuning the sp2/sp3 Configuration

“…The core-level C 1s spectra obtained from all samples are asymmetric toward higher binding energy with a relatively broad FWHM of ∼2.2 eV, which implies that there were several sub-peaks corresponding to the superposition of sp 2 , sp 3 that reactions involving hydrogen were prohibited during the growth procedure. 6,40 Therefore, the changes observed in the PES spectra show that the main carbon configuration of the carbon films changes from sp 3 to sp 2 with increasing sputtering power, in agreement with the Raman spectroscopy results. Next, we explored the valence band structure of the carbon films from the PES spectra shown in Figure 3a.…”

“…As the sputtering power increases, the CC peak increases considerably, along with strong suppression of the C–O peak. All carbon had shown negligible amounts of hydrogen-terminated carboxyl (−COOH) regardless of sputtering power, which indicates that reactions involving hydrogen were prohibited during the growth procedure. , Therefore, the changes observed in the PES spectra show that the main carbon configuration of the carbon films changes from sp 3 to sp 2 with increasing sputtering power, in agreement with the Raman spectroscopy results.…”

“…Carbon allotropes have been utilized as major components in many different fields, such as mechanical protection, electronic devices, and energy harvesting, owing to their superior properties, including high hardness, thermal conductivity, transparency, low electrical resistivity, and chemical inertness. Because such properties are strongly influenced by the hybridization configuration of carbon atoms, it is important to understand the relationship between the hybridization structure of carbon and its properties and to find the optimum synthesis conditions for carbon films with appropriate sp 2 /sp 3 ratios. − Generally, amorphous carbon (a-C) films show higher hardness, , transparency, and thermal stability than hydrogenated amorphous carbon (a-C:H) films . This has attracted much research interest from various application fields, including lubricative or protective coating, electromagnetic wave shielding, sensors, and biology. , In addition, advances in deposition techniques, such as high-power impulse magneto sputtering (HiPIMS), − electron cyclotron resonance sputtering, and unbalanced magnetron sputtering, have facilitated the synthesis of diverse carbon nanostructures, providing greater opportunities for carbon-based applications.…”

Graphite nanocrystals coated paper-based electrode for detection of SARS-Cov-2 gene using DNA-functionalized Au@carbon dot core–shell nanoparticles

“…At higher times, the G peak shifts to lower wavenumbers [49] . The blue shift of G band caused by reducing the number of ordered aromatic rings contributes to the passing from graphite nanocrystals to amorphous carbon [50] . With increasing desorption time from 45 min to 1 h, graphite nanocrystals were formed in a bed of amorphous carbon.…”