سنتز نانوذره¬های روی دی اکسید دوپه‌شده با نقره با دو روش سل-ژل و هم رسوبی و مقایسه ویژگی فیزیکی-شیمیایی و فعالیت‌های پادباکتری آن ها
محورهای موضوعی : شیمی معدنی
میترا شعبانی نیا
1
,
منوچهر خراسانی
2
,
سحر بنی یعقوب
3
1 - دانشجوی دکترای شیمی معدنی دانشگاه آزاد اسلامی واحدعلوم وتحقیقات . تهران.ایران
2 - استاديار دانشکده مهندسی پلیمر و رنگ، دانشگاه صنعتی امیرکبیر، تهران، ایران.
3 - Department of chemistry, Science and research branch, Isalamic azad University, Tehran, Iran
کلید واژه: نانوذره¬های روی دیاکسید دوپه‌شده با نقره, سل-ژل, هم¬رسوبی, ویژگی پاد¬باکتری,
چکیده مقاله :
در این پژوهش، نانوذرههای روی دیاکسید دوپه‌شده با نقره (Ag-ZnO) با دو روش سل-ژل و همرسوبی سنتز و ویژگی پادباکتری نانوذرههای ZnO و Ag-ZnO بررسی شدند. طیفسنجی فروسرخ تبدیل فوریه (FTIR) گروه عاملی آن‌ها را شناسایی و تایید کرد که نقره با نانوذرههای روی اکسید دوپه شده است. نتیجههای بهدست‌آمده از پراش پرتو ایکس (XRD) ساختار ورتزیت شش‌ضلعی را برای نانوذرههای سنتزشده با هر دو روش نشان داد. بررسی ریخت سطح و تعیین اندازه و ترکیب نانوذرهها با میکروسکوپ الکترونی روبشی (SEM) انجام شد. تصویرهای SEM نشاندهنده حضور نانوذرههای انبوهه‌شده در هر دو روش بود، ولی در روش سل-ژل ریخت نانوذرهها به pH محلول پیشساز بستگی داشت. تغییر ریخت صفحه مانند به میله مانند زمانیکه pH محیط از ٧ به ١٠ افزایش یافت، مشاهده شد. فعالیت‌های پادباکتری نانوذرههای سنتزشده علیه باکتریهای اشریشیا کلی بهعنوان باکتری گرم منفی و استافیلوکوکوس اورئوس بهعنوان باکتری گرم مثبت با روش انتشار دیسک ارزیابی و مشاهده شد که فعالیت پادباکتریZnO با دوپه‌کردن Ag بهطور چشمگیری بهبود یافت. همچنین، این نانوذرهها در مقابل باکتریهای گرم مثبت ویژگی پادباکتری بیشتری نشان دادند.
In this research, silver-doped zinc oxide nanoparticles were synthesized using sol-gel and coprecipitation methods and the antibacterial behavior of them was evaluated. Fourier transform infrared spectroscopy (FTIR) identified the functional groups of synthesized samples and confirmed that Ag was doped well into ZnO nanoparticles. X-ray diffraction (XRD) confirmed the hexagonal wurtzite structure for the nanoparticles synthesized by using both methods. Surface morphology, particle size and composition of Ag-ZnO nanoparticles were studied by scanning electron microscope (SEM). The SEM images showed the agglomerations of the particles synthesized by using both methods but in sol-gel method morphology of nanoparticles depended on pH of precursor. Morphology changes from irregular forms of sheet-shaped to rod-shaped nanoparticles was observed when pH increased from 7 to 10. Antibacterial behaviors of the synthesized nanoparticles against Escherichia coli (E. Coli) as a gram-negative bacteria and Staphylococcus aureus as a gram-positive bacteria were evaluated by disk diffusion test method, and it was observed that the antibacterial activity of ZnO improved by Ag doping. Our results showed that synthesized nanoparticles show more antibacterial activity against S. aureus than E. Coli.
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