L-Sistein Derişimine Bağlı -Zn(OH)2 Oluşumu ve Kalsinasyon Ürünleri Olarak Farklı Morfolojideki ZnO Yapıları

L-sistein katkı maddesi kullanılarak çinko nitrat ve sodyum hidroksitin çöktürme işlemiyle elde edilen ürünlerin yapısal karakterizasyonları L-sistein:çinko mol oranının 0.165:1 olduğu sentez koşullarında ?-Zn(OH)2 kristal yapısının oluştuğunu göstermiştir. Örneğin SEM görüntülerinde L-sistein:çinko oranı on kat artırıldığında ise belirgin bir kristal yapı oluşmamıştır. Düşük ve yüksek sistein: çinko oranında sentezlenen örneklerin L-sistein içerikleri sırasıyla % 6.0 ve % 38.4 olarak hesaplanmıştır. Her iki örneğin 700oC'de 2 saat kalsinasyonu ZnO oluşumuyla sonuçlanmıştır. ZnO örneklerinin UV-Vis spektrumlarında 329 nm ve 381 nm'de olmak üzere iki pik gözlenmiştir. Bu örneklerdeki kristal kusurları PL spektroskopisi ile belirlenmiştir

L-Cysteine Concentration Dependent -Zn(OH)2 Formation and ZnO Structures with Different Morphology as Calcination Products

Structural characterization of the precipitation products of zinc nitrate and sodium hydroxide obtained using L-cysteine additive was carried out. XRD analysis showed that -Zn(OH)2 crystal structure formed in the synthesis condition where L-cysteine:zinc molar ratio was 0.165:1. Plate-like morphology, was oberved in the SEM micrograph of this sample. No crystal structure was apparent upon increasing L-cysteine:zinc ratio ten fold. L-cysteine contents of the samples synthesized at low and high L-cysteine:zinc ratios were calculated as 6.0 % and 38.4 %, respectively. Calcination of both samples at 700oC for 2 hours yielded formation of ZnO. In the UV-Vis spectra of the ZnO samples two peaks were observed at 329 nm and 381 nm. Crystal defects of these samples were determined via PL spectroscopy

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