Nagoya University · Engineering
Professor Takayuki Tokoroyama's research lab specializes in the development and characterization of advanced carbon-based thin films, particularly diamond-like carbon (DLC) and CNx coatings, with a focus on their tribological properties and surface engineering applications. The lab investigates the influence of environmental factors—such as ultraviolet irradiation—on the chemical and mechanical performance of these coatings, employing advanced surface analysis techniques like XPS, AES, and Raman spectroscopy. A key research direction involves enhancing the depth resolution of Raman spectroscopy using surface-enhanced Raman scattering (SERS) with gold nanoparticles and sputtered gold, enabling precise structural analysis of ultra-thin carbon coatings on silicon substrates. The lab also explores the integration of nanomaterials and surface modification techniques to optimize coating durability and functionality for industrial applications.
Figures are computed from collected data and may differ slightly.
ABSTRACT The influence of ultraviolet (UV) irradiation on low frictional performance of CN x coatings with 100 nm thickness having nitrogen contents of 9%, 14% and 19% deposited on Si(100) substrate by ion beam mixing was investigated in N 2 atmosphere environment. Three UV lights of 254, 312 and 365 nm were used to irradiate the surface of CN x / Si(100) for 60 min. The changes of N / C ratio and atomic binding energy in the coating were analysed using Auger electron spectroscopy and X‐ray phot
In general, Raman analysis is one of the useful candidates to obtain structure of carbonaceous coatings. To improve the depth resolution of Raman analysis, surface-enhanced Raman Scattering (SERS) using gold nanoparticles (Au nanoparticles: AuNPs) and Au sputtered particles were investigated. The analysis was conducted to approximately 1.7, 2.4, 4.7, and 10.0 nm thickness of carbon coatings on silicon substrate with a 532 nm incident wavelength laser. The results indicated that the underlying si
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