| Summary: | 碩士 === 義守大學 === 材料科學與工程學系碩士班 === 97 === This study aims to investigate the crystal structure, surface morphology and antimicrobial ability of the (Zr53Cu30Ni9Al8)99.5Si0.5 and (Cu42Zr42Al8Ag8)99.5Si0.5 amorphous alloy thin films prepared by DC sputtering. From the structural analysis by XRD and TEM, the (Zr53Cu30Ni9Al8)99.5Si0.5 and (Cu42Zr42Al8Ag8)99.5Si0.5 thin films exhibited an excellent glass forming ability. According to the SEM observation and the AFM analysis, the surface roughness of SUS 304 stainless steel significantly reduced form 7 nm to about 1 nm after the deposition of amorphous thin films. To evaluate the antimicrobial capability of the (Zr53Cu30Ni9Al8)99.5Si0.5 and (Cu42Zr42Al8Ag8)99.5Si0.5 amorphous alloy thin films, the organisms such as Candida albicans, Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus were chosen. During the incubation test of the microbes, the digital photography record to the growth images at each period of setting time and then assessed the areas of growth by the software of Image-Pro Plus. According to the images analysis, the amorphous alloy thin films possess a much better antimicrobial effect than that of SUS 304 stainless steel substrates. In particular, the (Cu42Zr42Al8Ag8)99.5Si0.5 amorphous alloy thin films exhibit a long-term antimicrobial capability. In summary, the surface roughness of the amorphous thin films acts as an important factor to affect the antimicrobial capability. The microbes are difficult to attach and move on an ultra-smooth surface. Then, the biological activities of the microbes are effectively suppressed. This study offers new findings for the BMGs in the medical applications.
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