اثر غلظت سود بر نانوذرات اکسید کبالت تهیه شده به روش هم رسوبی با مایع یونی بر پایه پیریدینیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پردیس علوم و تحقیقات خوزستان، دانشگاه آزاد اسلامی

2 واحد اهواز، دانشگاه آزاد اسلامی،

3 دانشگاه شهید چمران

چکیده

در این پژوهش، نانوذرات اکسید کبالت به روش هم رسوبی با مایع یونی N- اکتیل پیریدینیوم برمید [Br][OPy] در محیط آبی با تغییر غلظت NaOH تهیه شدند. ویژگی­های نانوذرات تهیه شده با طیف سنج تبدیل فوریه فروسرخ (FT-IR)، پراش سنج پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی اثر میدانی (FE-SEM)، مغناطیس سنج نمونه ارتعاشی (VSM) و طیف­سنج مرئی- فرابنفش (UV-Vis) بررسی گردیدند. براساس نتایج XRD، با افزایش غلظت NaOH، اندازه متوسط بلورک­ها کاهش یافت که در این جا، کوچکترین ذرات با استفاده از 3 میلی مول NaOH  به دست آمدند. بر پایه تصاویر FE-SEM، ذرات دارای ریخت کروی و صفحه مانند هستند. نمونه با کوچکترین اندازه بلورک­ها دارای بالاترین انرژی گاف نواری برابر با 01/3 الکترون ولت است. نتایج VSM نمونه­ها نشان داد که همه آنها ماهیت فرومغناطیسی دارند و مقدار مغناطش اشباع با کاهش اندازه ذرات کاهش یافته است.    

کلیدواژه‌ها

عنوان مقاله [English]

Effect of NaOH concentration on synthesis of cobalt oxide nanoparticles by pyridinium-based ionic liquid by co-precipitation method

نویسندگان [English]

  • Darband1 1
  • Tahanpesar 2
  • Badri 3
  • Sanaeishoar 2
1
2
3
چکیده [English]

In this study, nano-sized cobalt oxide samples were prepared by changing the NaOH concentration by co-precipitation using N-octyl pyridinium bromide [OPy][Br] ionic liquid in an aqueous medium. Properties of prepared nanostructures were investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), vibration sample magnetometer (VSM), and ultraviolet-visible (UV-Visible) spectroscopy. XRD diffraction results show that with increasing NaOH concentration, the average size of crystals decreased. In this paper, the smallest particles in the range of 19 to 23 nm were obtained using 3 mmol NaOH. Using FE-SEM images, it can be seen that the particles have a spherical and plate-like shape. The value of Eg for the sample with the smallest crystal size of 17 nm has the highest bandgap energy of 3.01 electron volts. VSM analysis of the samples showed that all samples were ferromagnetic in nature and the saturation magnetization of the samples decreased with decreasing particle size.
 

کلیدواژه‌ها [English]

  • Cobalt Oxide Nanostructure -N-Octylpyridinium Bromide
  • co-precipitation
  • Reflux in the Aqueous Medium

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سابقه مقاله

  • تاریخ دریافت: 03 مهر 1400
  • تاریخ بازنگری: 29 مهر 1400
  • تاریخ پذیرش: 30 آبان 1400

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