2D MATERIALS COATED BY AUTOMATED DIPPING SYSTEM

Abstract

Inorganic nanosheets, members of the two-dimensional (2D) materials family, have one or several atomic thickness and they are obtained by chemical exfoliation of bulk layered oxide materials. In this study, automated dipping system was designed and manufactured to apply layer-by-layer method for fabrication of nanofilms composed by nanosheets. The performance of the system for nanofilm productions was determined using Nb6O17 nanosheets. Therefore, layered inorganic K4Nb6O17·3H2O material was exfoliated to yield Nb6O17 nanosheets having thickness around 2 nm. Negatively charged Nb6O17 nanosheets and positively charged polydiallyldimethylammonium chloride (PDDA) were alternately deposited layer-by-layer method onto quartz substrates using automated dipping system. An atomic force microscopy (AFM) image visualized 5 deposition cycles of Nb6O17/ PDDA pair with an effective coverage of the surface. Moreover, absorption spectra were recorded for various increasing deposition cycles of Nb6O17/ PDDA pair. The increase in the absorbance value obtained with the system was qualitatively similar to the increase in the absorbance ratio obtained in the manual coating results reported in the literature. It is shown that the low cost coating system proposed in this study can be used in nanofilm fabrication.

Keywords

• Nanofilm,Nanosheet,Exfoliation,Layer-by-Layer Method,Automated Dipping System

DALDIRMALI KAPLAMA SİSTEMİ İLE 2B MALZEMELERİN KAPLANMASI

Abstract

İki boyutlu (2B) malzeme ailesinin bir üyesi olan inorganik nanolevhalar bir ya da birkaç atom kalınlığına sahip olup yığın katmanlı oksit malzemelerin kimyasal olarak pullandırılması ile elde edilmektedir. Bu çalışmada, nanolevhalardan meydana gelen nanofilmlerin tabaka-tabaka yöntemi ile üretilmesi için bir daldırmalı kaplama sistemi tasarlanarak üretilmiştir. Sistemin nanofilm üretimindeki performansını test etmek amacıyla Nb6O17 nanolevhalar kullanılmıştır. Bunun için katmanlı K4Nb6O17·3H2O malzemesi pullandırılarak kalınlıkları yaklaşık 2 nm nanolevhalar elde edilmiştir. Daha sonra, negatif yüklü Nb6O17 nanolevhalar ve pozitif yüklü polidiallildimetilamonyum klorür (PDDA), otomatik daldırma sistemi kullanılarak kuartz alttaşlar üzerine dönüşümlü olarak yerleştirilmiştir. Nb6O17/PDDA’ in 5 kaplama döngüsüne sahip yüzey, atomik kuvvet mikroskobu ile taranarak alttaşın etkili şekilde kaplandığı görüntülenmiştir. Ayrıca, absorbans spektrası, Nb6O17/PDDA’ in çeşitli kaplama döngüleri için kaydedilmiştir. Daldırmalı kaplama sistemi ile elde edilen absorbans değerindeki artış literatürde raporlanmış manuel kaplama sonucunda elde edilen absorbans oranındaki artış ile kalitatif olarak benzer özellikler göstermiştir. Bu çalışmada önerilen düşük maliyetli ve laboratuvar ortamında geliştirilen sistemin de nanofilm kaplama araştırmalarında kullanılabileceği ortaya konmuştur.

Keywords

• Nanofilm,Nanolevha,Pullandırma,Tabaka-Tabaka Yöntemi,Daldırmalı Kaplama Sistemi

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