اثر نسبت منظری و خلوص نانولوله‌های کربن چنددیواره بر شکل‌شناسی سطح و خواص الکتریکی نانوالیاف کامپوزیتی

نوع مقاله: پژوهشی

نویسنده

اصفهان، دانشگاه صنعتی اصفهان، دانشکده مهندسی نساجی، صندوق پستی: 83111-84156

چکیده

الکتروریسی محلول‌های پلیمری دارای نانوذرات، نوعی قابلیت تولید نانوالیاف کامپوزیتی نوین برای کاربردهای کارآمد است. در پژوهش حاضر، آثار نسبت منظری و خلوص نانولوله‌های کربن چنددیواره (MWCNTs) بر خواص ساختاری و الکتریکی نانوالیاف کامپوزیتی تولید شده با روش الکتروریسی بررسی شده‌اند. ابتدا، نانولوله‌های کربن مصرفی با استفاده از میکروسکوپی الکترونی پویشی (SEM) و طیف‌سنجی رامان مطالعه شدند. سپس، پراکنش برای تهیه محلول‌های نانوکامپوزیتی دارای MWCNTs به روش فیزیکی و با استفاده از ماده سطح‌فعال غیریونی انجام شد. در انتها، محلول‌های کامپوزیتی تهیه شده به سرنگ شیشه‌ای متصل به منبع تغذیه جریان DC اضافه شدند و فرایند الکتروریسی با استفاده از ولتاژ kV 15 بین سوزن و جمع‌کننده انجام شد. نتایج حاکی از وابستگی خلوص و بلورینگی نانولوله‌های کربن به شدت پیک G و نسبت پیک‌های G/D است. خواص ساختاری نانوالیاف کامپوزیتی نشانگر وابستگی شدید آن به ابعاد نانولوله‌های کربن است، به‌طوری که در نسبت‌های منظری بیشتر، خواص ساختاری نانوالیاف بهبود می‌یابد. تحلیل ساختاری نانوالیاف کامپوزیتی نشانگر تغییر ساختار نانوالیاف با افزایش قطر MWCNTs است. ساختارهای بسیار صاف از نانوالیاف کامپوزیتی دارای %1 وزنی نانولوله کربن حاکی از کیفیت پراکنش بسیار مناسب نانولوله‌های کربن روی ساختار نانوالیاف تولید شده است. نانوالیاف کامپوزیتی با مقدار خلوص و نسبت منظری ییشتر، خواص الکتریکی مطلوب‌تری دارند. همچنین، مقدار رسانندگی الکتریکی نانوالیاف کامپوزیتی را می‌توان از مقادیر S/cm 10-8 (عایق) تا 3-10 S/cm (رسانا) با انتخاب نانولوله کربن با نسبت منظری و مقدار خلوص متفاوت تنظیم کرد. بنابراین، استفاده از نانولوله‌های کربن با نسبت منظری و خلوص بیشتر در ساختار نانوالیاف کامپوزیتی روش بسیار مناسبی برای توسعه ویژگی‌های ساختاری و عملکرد الکتریکی نانوالیاف الکتروریسی شده به‌شمارمی‌آید.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Multi-Walled Carbon Nanotubes' Aspect Ratio and Purity on the Surface Morphology and Electrical Properties of Composite Nanofibers

نویسنده [English]

  • Komil Nasouri
Department of Textile Engineering, Isfahan University of Technology, P.O. Box: 84156-83111,
چکیده [English]

Hypothesis: Electrospinning of nanoparticles/polymer solutions offers the potential to achieve novel composite nanofibers in a variety of high performance applications. In this respect, the aspect ratio and purity of multi-walled carbon nanotubes (MWCNTs) were examined to study the morphological and electrical properties of the electrospun composite nanofibers.
Methods: In the first step, MWCNTs samples were characterized using scanning electron microscopy (SEM) and Raman spectroscopy. Next, nanocomposite solutions containing MWCNTs were prepared by physical dispersion method in presence of a non-ionic surfactant. Finally, the prepared composite solutions were loaded to a glass syringe and connected to a DC power supply device. The electrospinning was performed by applying a high voltage of 15kV between the needle and the rotating collector.
Findings: It is generally accepted that a combination of G-band intensity and G/D ratio is useful to evaluate the purity and crystallinity of MWCNTs. The morphological properties of the electrospun composite nanofibers showed their high dependency on carbon nanotubes dimensions, so that at higher aspect ratios the morphological properties generally improved. The morphological analysis of the composite nanofibers revealed that the deformation of the nanofibers increased with increasing MWCNTs diameter. Very smooth surfaces of the composite electrospun nanofibers even with 1 wt% MWCNT concentration were successfully achieved because of the high stability of MWCNT dispersions. The composite nanofibers with higher purity and aspect ratio presented better electrical conductivity. The electrical conductivity of electrospun composite nanofibers could be adjusted from ~10–8 S/cm (insulator) to ~10–3 S/cm (conductor) by different aspect ratios and purities of MWCNTs. MWCNTs with high aspect ratio and high purity offer a promising way to develop electrospun composite nanofibers with improved morphological and electrical properties.

کلیدواژه‌ها [English]

  • electrospinning
  • carbon nanotubes
  • purity
  • aspect ratio
  • electrical conductivity
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