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Kim, Wang Ryeol; Park, Min Seok; Jung, Uoo Chang; Kwon, Ah Ram; Kim, Yong Whan; Chung, Won Sub
Surface & coatings technology, 03/2014, Volume: 243Journal Article, Conference Proceeding
Diamond-like carbon (DLC) films were deposited by the linear ion source (LIS)-physical vapor deposition condition changing the anode voltages from 800V to 1800V and bias voltages from 0V to −200V and characteristics of the films were investigated using Nano-indentation, Micro Raman spectroscopy, Field Emission-Scanning Electron Microscope (FE-SEM), Residual stress tester, Time-of-Flight Secondary Ion Mass Spectroscopy (TOF-SIMS) and X-ray Photoelectron Spectroscopy (XPS). The residual stress and hardness increased relatively with increasing the ion energy up to anode voltage of 1400V and −100 bias voltage respectively. From the Micro Raman analysis, the content of sp3 carbon in sp3/sp2 ratio was increased with increasing the anode voltage. From these results, residual stress and hardness of DLC films are increased as increase of anode voltages due to the enhancement of 3-dimensional cross-links between carbon atoms and dangling bond. Also, the internal compressive stress is increased with increasing the voltages. Therefore, the optimum anode and bias voltage are considered to be around 1400V and −100V respectively in these experimental conditions. ► DLC films were deposited by linear ion source — PVD method. ► sp3 bond is maximum at anode voltage above 1400V and bias voltage of −100V. ► DLC film hydrogen contents were 37at.%, and the hardness was 23GPa. ► The optimum anode voltage and bias voltage for DLC deposition are 1400V and −100V, respectively.
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