| Summary: | Endoscope was used as tool to view internal part of human body in advanced medical devices especially for visual examination. However, the problem that disrupt this procedure is high possibility of human body fluids to stick and attach on the lenses will give limitation to the surgeons to see the desired part inside human body. Polytetrafluoroethylene (PTFE) is a popular hydrophobic coating that used to prevent fluid from adhering on endoscope lens and helps in decreasing the time-consuming to clean up the surface of the lens. In this study, a RF Magnetron sputtering method was performed to coat PTFE hydrophobic surfaces on two different lens materials, which are acrylonitrile butadiene styrene (ABS), styrene acrylonitrile (SAN). Physicochemical properties of uncoated and PTFE-coated samples were analyzed by using water contact angle test (goniometer), UV-Vis spectrometer, Fourier-transform infrared (FTIR) spectroscope, scanning electron microscope (SEM), and atomic force microscope (AFM). In this study, the parameter that has been investigated was the water contact angle on the surface of the samples with different sputtering time, which were 30 minutes, 60 minutes, 90 minutes and 120 minutes. From this study, the best sample of SAN samples was during sputtering time of 60 minutes with transmittance of 98.29% and contact angle of 121.53˚. Meanwhile, for ABS samples, the best sample of ABS was also during sputtering time of 60 minutes with transmittance of 98.63% and contact angle of 94.28˚.
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Based on the SEM and AFM results, PTFE does not spread homogeneously over the surface of samples where it is easily cause the coating to chip out from the surfaces. RMS roughness value of the coated-samples for both ABS and SAN show increase value each sputtering time. The RMS values for SAN samples were 50.7443 nm, 65.8518 nm, 74.1561 nm dan 78.9618 nm, for sputtering time of 30 minutes, 60 minutes, 90 minutes and 120 minutes, respectively. Whereas, the RMS values for ABS samples were 15.1248 nm, 69.4297 nm, 66.0436 nm dan 72.0760 nm, for sputtering time of 30 minutes, 60 minutes, 90 minutes and 120 minutes, respectively. For SAN samples, the best sample of SAN was during sputtering time of 60 minutes with transmittance of 98.29% and contact angle of 121.53˚. Meanwhile, for ABS samples, the best sample of ABS was also during sputtering time of 60 minutes with transmittance of 98.63% and contact angle of 94.28˚.
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