Structural, Morphological and Optical Properties of Zn0.95-xCu0.05CoxO Synthesized by Co-Precipitation Method

Öz

There is increasing interest in the synthesis, characterization and application of mixed oxides for better functional performance compared to base metal oxides. In this study, Zn0.95-xCu0.05CoxO (0 ≤ x ≤ 0.05) nanocomposites were synthesized by co-precipitation method. The synthesized samples were characterized for its structural, compositional and optical properties using by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and UV–Vis absorption spectroscopy. According to XRD results, it is seen that the würtzite structure of hexagonal ZnO does not change. In addition, it can be said that the separate phases of Cu2O and Co3O4 are formed due to the unreacted parts of Cu+ and Co+3 ions. This is also confirmed by XPS results. The average crystallite size of the Zn0.95-xCu0.05CoxO nanocomposites were found in the range of 30.02-22.00 nm. It is seen that the crystal growth decreases as a result of Cu and Co doping in ZnO. SEM images show that all samples are composed of spherical nanoparticles. EDS spectra confirms the presence of Zn, Cu, Co, and O atoms in the samples with expected stoichiometry. As the Co concentration increases from x=0.00 to x= 0.05, the band gap increases from 3.26 eV to 3.57 eV.

Anahtar Kelimeler

• ZnO nanoparticle
• Cu and Co doped
• optical properties
• co-precipitation method

Birlikte Çöktürme Yöntemi ile Sentezlenen Zn0.95-xCu0.05CoxO’nun Yapısal, Morfolojik ve Optik Özellikleri

Öz

Temel metal oksitlere kıyasla daha iyi fonksiyonel performans için karışık oksitlerin sentezi, karakterizasyonu ve uygulamasına olan ilgi giderek artmaktadır. Bu çalışmada, Zn0.95-xCu0.05CoxO (0 ≤ x ≤ 0.05) nanokompozitleri birlikte çöktürme yöntemi ile sentezlendi. Sentezlenen örnekler, X-ışını Kırınımı (XRD), Taramalı Elektron Mikroskobu (SEM), Enerji Dağılım Spektroskopisi (EDS), Xışını Fotoelektron Spektroskopisi (XPS), Raman spektroskopisi ve UV–Vis absorpsiyon spektroskopisi kullanılarak yapısal, bileşimsel ve optik özellikleri açısından karakterize edildi. XRD sonuçlarına göre altıgen ZnO’nun würtzit yapısının değişmediği görülmektedir. Ayrıca, Cu2O ve Co3O4'ün ayrı fazlarının Cu+ ve Co+3 iyonlarının reaksiyona girmeden kalan kısımlarından dolayı oluştuğu söylenebilir. Bu XPS sonuçları ile de teyit edilmiştir. Zn0.95-xCu0.05CoxO nanokompozitlerinin ortalama kristal boyutları 30.61-27.24 nm aralığında bulundu. ZnO'da Cu ve Co katkısının bir sonucu olarak kristal büyümenin azaldığı görülmektedir. SEM görüntülerinde, tüm örneklerin küresel nanopartiküllerden oluştuğu görülmektedir. EDS spektrumu beklenen stokiyometri ile numunelerde Zn, Cu, Co ve O atomlarının varlığını doğrulamaktadır. Co konsantrasyonu x=0.00'den x= 0.05'e arttıkça, bant aralığı 3.26 eV'den 3.57 eV'ye artmıştır.

Anahtar Kelimeler

• ZnO nanopartikül
• Cu ve Co katkılandırma
• optik özellikler
• birlikte çöktürme yöntemi.

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