Necati Başman, Mehmet GÖKÇEN, Cengiz TEMİZ

TiO2 Katkılı Elmas-Benzeri Karbon Filmlerin Yeni Bir Çözeltiden Üretilmesi ve Karakterizasyonları

Elmas-benzeri karbon (EBK) filmler gösterdikleri mekanik ve fiziksel özelliklerinden dolayı en çok çalışılan kaplama malzemeleridir. Bu filmlerin özelliklerinin iyileştirilmesi için üretim yöntemleri ve katkılanmaları üzerine pek çok çalışma yapılmıştır. Üretim yöntemleri arasında elektrokimyasal biriktirme yöntemi, kolaylık ve ucuz ekipman gibi avantajlara sahiptir. Daha önceki bir çalışmamızda, titanyum metalini hidrojen peroksit (H2O2) içerisinde çözündürerek elde ettiğimiz titanyum çözeltisi ile metanol (CH3OH) karışımından, elektrokimyasal yöntemle titanyum dioxide (TiO2) katkılı EBK film üretmeyi başarmıştık. Bu çalışmada ise TiO2 katkılı EBK filmler titanyum isopropoxide (TTIP) ve metanol karışımından oluşturulan çözeltilerin elektrolizi ile biriktirildi. İki farklı TTIP konsantrasyonunda üretilen filmler, morfolojik, yapısal ve elementel olarak karakterize edildi. Taramalı elektron mikroskobu fotoğrafları filmlerin homojen ve kompakt olduğunu göstermiştir. Filmlerin 600 0C ‘de tavlanmasıyla filmlerin morfolojisinde bir değişiklik gözlenmemiştir. X-ışınları fotoelektron spektroskopisi analizleri, titanyumun film içerisinde TiO2 formunda olduğunu ve TTIP konsantrasyonunun artmasıyla filmdeki titanyum miktarının arttığını göstermiştir. X-ışınları kırınımı analizleri, TiO2’nin EBK matriste amorf olarak bulunduğunu ve daha düşük TTIP konsantrasyonuyla hazırlanan filmin elmas içeriğe sahip olduğunu ortaya koymuştur. 600 0C de tavlandıktan sonra ise bu filmin grafitize olduğu görülmüştür. Elde edilen bulgular, TiO2 katkılı EBK nanokompozit filmlerin bu çalışmada önerilen çözeltiyle kolaylıkla üretilebileceğini göstermiştir.

Anahtar Kelimeler:

Elmas-benzeri karbon, Titanyum dioksit, Nanokompozit

Deposition of TiO2-Doped Diamond-Like Carbon Films From a New Solution and Their Characterizations

Diamond-like carbon (DLC) films are the most studied coating materials due to their mechanical and physical properties. Many studies have been conducted on the deposition methods and doping to improve the properties of these films. Among the deposition methods, the electrochemical deposition has advantages such as convenience and inexpensive equipment. In our previous study, we were able to produce a titanium dioxide (TiO2) doped DLC film by electrochemical method from a mixture of methanol (CH3OH) and titanium solution obtained by dissolving titanium metal in hydrogen peroxide (H2O2). In this study, TiO2 doped DLC films were deposited by electrolysis of solutions formed from a mixture of titanium isopropoxide (TTIP) and methanol. The films deposited at two different TTIP concentrations were characterized morphologically, structurally and elementally. Scanning electron micrographs were shown that the films are homogeneous and compact. No change was observed in the morphology of the films after annealing the films at 600 0C. Chemical analyses showed that titanium was in the form of TiO2 and the amount of titanium increased with increasing TTIP concentration. X-ray diffraction analysis revealed that TiO2 was amorphous in the DLC matrix and the film prepared with lower TTIP concentration had diamond content. After annealing at 600 0C, it was seen that this film was graphitized. The obtained findings showed that TiO2 doped DLC nanocomposite films can be easily deposited with the solution proposed in this study.

Keywords:

Diamond-like carbon, Titanium dioxide, Nanocomposite,

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