BAKIR ALTTAŞA YAPILAN ÖN İŞLEMİN TEK TABAKA GRAFEN FİLM KALİTESİNE ETKİSİ

Tekdüze büyük ölçekli grafen tabakaları sentezlemek için çeşitli metotlar önerilmiştir. Bunlardan en çok tercih edileni bakır veya nikel alttaş üzerine kimyasal buhar biriktirme (CVD) yöntemiyle grafen büyütmektir. Son çalışmalarda, kusursuz formasyona sahip tek tabaka grafenin, bakırın kristal yapısına kritik bir şekilde bağlı olduğu bilinmektedir. Bu etkinin yanı sıra, bakır alttaşa yapılan ön işlemin de grafen oluşumunu etkilediği düşünülmüştür. Çalışmada alttaş olarak 25 ?m kalınlıklı bakır folyolar standart temizleme, elektroliz ile parlatma ve tavlama gibi üç farklı ön işlemden geçirilmiştir. Daha sonra metan (CH4) ve hidrojen (H2) proses gazları kullanılarak grafen sentezlenmiştir. Bakır folyonun yapısı ve kalitesi XRD ve XRF ile belirlenmiştir. Büyütme işleminden sonra bakır alttaşların üst yüzeyleri ve alt yüzeyleri Konfokal Raman kullanılarak incelenmiş, oluşan grafenin özellikleri tespit edilmiştir. Sonuç olarak elektroliz ile parlatma ön işleminden geçirilmiş bakır alttaş üzerinde, tek tabaka grafen oluşumu gözlenirken diğer ön işlemlerden geçirilmiş bakır alttaşlar üzerinde çok tabakalı grafenler gözlenmiştir

(THE EFFECT OF PRETREATMENT OF COPPER SUBSTRATE TO THE QUALITY OF SINGLE LAYER GRAPHENE

Among the various methods suggested to synthesize uniform and wide graphene sheets, growing graphene on copper or nickel substrate via Chemical Vapor Deposition (CVD) is the most preferred. Recent works have been demonstrated that defect free formation of large mono-layer graphene critically depends on the copper's crystalline structure. Moreover the substrate surface state is another important parameter involving an appropriate pretreatment. In this study, 25 ?m thick copper substrate has been prepared with three different process; standart cleaning, electro-polishing and annealing. Then graphene growth has been performed using methane (CH4) and hydrogen (H2) gases. Structure and purity of copper foil have been determined using XRD and XRF techniques. In order to determine the graphene properties, the upper surface and the lower surface of copper substrate have been examined using Confocal Raman. At the end of the work, large single layer graphene has been observed on the copper substrate pretreated by electro-polishing, while multilayer graphene has been observed on substrates pretreated by the other methods

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Mücahit YILMAZ; Yrd.Doç.Dr. (Assist.Prof.)
Lisans derecesinin 2000'de Ankara Gazi Üniversitesi Gazi Eğitim Fakültesi Fizik Eğitimi Bölümünden, Yüksek
Lisans derecesini 2004'te Konya Selçuk Üniversitesi Fen Bilimleri Enstitüsü Fizik Eğitiminden, Doktora
derecesini 2008 yılında Konya Selçuk Üniversitesi Fen Bilimleri Enstitüsü Fizik Bölümünden aldı. 2013-2014
yıllarında ODTÜ-GÜNAM'da (Güneş Enerjisi Araştırma ve Uygulama Merkezi) doktora sonrası çalışmalarda
bulundu. Halen Necmettin Erbakan Üniversitesi Seydişehir Ahmet Cengiz Mühendislik Fakültesi Metalürji ve
Malzeme Mühendisliği bölümünde öğretim üyesi olarak görev yapmaktadır. Temel çalışma alanları: Yüksek
sıcaklık süperiletkenlerinde katkılama yerdeğiştirme çalışmaları, üçüncü nesil güneş gözeleri (ince film ve
nanokristal güneş gözeleri), iki boyutlu nano yapılar (iki boyutlu geçiş-metal dikalkojenleri ve grafen).
He got his bachelors' degree in the Physics Education at the Gazi University Gazi Education Faculty
Ankara/Turkey in 2000, his master degree in the Physics Education at Selçuk University Graduate School of
Natural Sciences Konya/Turkey in 2004, and his PhD degree in the Physics at Selçuk University Graduate
School of Natural Sciences Konya/Turkey in 2008. He did postdoctoral research at METU-GUNAM (Center for
Solar Energy Research and Applications) in 2013-2014. He is still an academic member of the Department of
Metallurgical and Materials Engineering at Necmettin Erbakan University Seydişehir Ahmet Cengiz Faculty of
Engineering. His major areas of interests are: Doping and substitution at high-temperature superconductors,
th generation solar cells (thin film and nanocrystal solar cells), two-dimensional structures (two-dimensional
transition-metal dichalcogenides and graphene)
Yasin Ramazan EKER; Yrd.Doç.Dr. (Assist.Prof.)
Ön lisans derecesini 2001'de Orléans (Fransa) Fen Fakültesi Malzeme Bilimi Bölümünden, Lisans derecesini
'te Orléans (Fransa) Fen Fakültesi Kimya Bölümünden, Yüksek Lisans derecesini 2004'te Orléans (Fransa)
Üniversitesi Fen Bilimleri Enstitüsü Malzeme Biliminden, Doktora derecesini 2008 yılında Orléans (Fransa)
Üniversitesi Fen Bilimleri Enstitüsü Malzeme Biliminden aldı. 2008-2010 yılları arasında CRMD-CNRS
Orléans'da (Bölünmüş Malzemeler Araştırma Merkezi) doktora sonrası çalışmalarda bulundu. Halen Necmettin
Erbakan Üniversitesi Mühendislik Fakültesi Metalürji ve Malzeme Mühendisliği bölümünde öğretim üyesi
olarak görev yapmaktadır. Temel çalışma alanları: Karbon malzemeler (karbon nanotüp, düzensiz karbonlar,
grafen), Lityum-iyon bataryalar (anot malzemeleri, katot katkı malzemeleri), süperkapasitörler (elektrot malzemeleri).
He got his associate in science degree in Material Science at Orléans University Faculty of Science (France) in
, his bachelors' degree in Chemistry at Orléans University Faculty of Science (France) in 2003, his master
degree in Material Science at the Orléans University Science Faculty (France) in 2004, and his PhD degree in
in Material Science at Orléans University Faculty of Science (France) in 2008. He did postdoctoral research at
CRMD-CNRS Orléans (Research Center on Divided Materials) in 2008-2010. He is still an academic member of
the Department of Metallurgical and Materials Engineering at Necmettin Erbakan University Faculty of
Engineering. His major areas of interests are: Carbon materials (Carbon nanotubes, disordered carbons,
graphenes), Lithium-ion batteries (anode materials, cathode fillers), supercapacitors (electrode materials).