Atilla EVCİN, Bahri ERSOY, Nalan ÇİÇEK BEZİR

Elektroeğirme Yöntemiyle Ag Katkılı Karbon Nanoliflerin Sentezi

Karbon nanolifler (KNL) ve karbon nanotüpler (KNT), yüksek mukavemetli, elastik modülü, termal ve elektriksel özellikleri ve nispeten düşük yoğunlukları nedeniyle gelişmiş kompozitler için çok işlevli tek boyutlu karbon nanomalzemelerini ortaya çıkarmıştır. KNL'ler, poliakrilonitril (PAN) gibi polimerden elektroeğirme yöntemiyle türetilebilir. Elektroeğirme, mikron altı aralığında çeşitli polimerik, seramik ve kompozit nanofiberlerin üretilmesi için basit ve yüksek verimli bir yöntemdir. Bu çalışmada, gümüş katkılı KNL'ler N, N-dimetilformamid (DMF) içindeki poliakrilonitril (PAN) çözeltilerinden elektroeğrilmiştir. Elektroeğirme parametreleri 25 kV voltaj, 1 mL/sa akış hızı,6 cm iğne-toplayıcı arasındaki mesafe olarak sabitlendi. Çözeltideki PAN derişimi DMF içerisinde ağırlıkça % 8 idi. Ag katkılandırılmış PAN nanolifleri, 1 saat boyunca 250 °C'de oksidasyon ile stabilize edilmiş ve H2/N2 karışımında 30 dak boyunca 1000 °C'de karbonize edilmiştir. KNL çap dağılımı ve morfolojileri taramalı elektron mikroskop analizi ve FibraQuant 1.3 yazılımı ile değerlendirilmiştir.

Anahtar Kelimeler:

Elektroeğirme, Nanolif, Ag

Synthesis of Ag Doped Carbon Nanofibers by Electrospinning Method

Carbon nanofibers (CNFs) and carbon nanotubes (CNTs) have created multifunctional one-dimensional carbon nanomaterials for advanced composites because of their high strength, elastic modulus, thermal and electrical properties and relatively low density. CNFs can be derived from polymer by means of electrospinning method, such as polyacrylonitrile (PAN). Electrospinning is a simple and high efficiency method to fabricate a variety of polymeric, ceramic and composite nanofibers at the submicron range. In this work, silver doped CNFs were electrospun from polyacrylonitrile (PAN) solutions in N,N-dimethylformamide (DMF). Electrospinning parameters were fixed at 25 kV voltage, 1 mL/hr flow rate, 6 cm of needle to collector distance. PAN concentration in the solution was 8 wt.% in DMF. Ag doped PAN nanofibers were stabilized by oxidation at 250 °C for 1 hr and carbonized at 1000 °C for 30 min in H2/N2 mixture. The diameter distribution and morphologies of the CNFs were evaluated by scanning electron microscope analysis and FibraQuant 1.3 software.

Keywords:

Electrospinning, Nanofiber, Ag,

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