Amorf borun elektrokimyasal eksfoliasyonuyla bor nanotabakalarının sentezi ve karakterizasyonu

Öz

Enerji, sensör ve çeşitli biyomedikal uygulamalar için bor nanotabakaları gelecek vaat eden bir malzemedir. Bor nanotabakalarının metal yüzeyler üzerine biriktirilerek hazırlanması ölçeklenebilir üretimi kısıtlayarak ticarileştirilmesine yönelik potansiyeli azaltmaktadır. Bu nedenle, yüksek verimli ve birkaç katmandan oluşan borun ölçeklenebilir bir şekilde üretilebilmesi için pratik bir prosesin geliştirilmesi oldukça önemlidir. Bu çalışmanın amacı, ölçeklenebilir özgün bir elektrokimyasal eksfoliasyon yöntemi kullanarak amorf bordan bor nanotabakalarının sentezlenmesidir. Bu yöntemde amorf bor, sodyum sülfat (Na2SO4) ve gliserin karışımı kullanılarak iki elektrotlu bir düzenekte anodik olarak eksfoliye edilmiştir. Eksfoliasyon, viskoziteyi arttırmak için gliserinin eklendiği (1:1 hacim oranı) 0,5 M Na2SO4 içerisinde +20, +30 ve +40 V’de gerçekleştirilmiştir. Bor nanotabakalarının yapısal karakterizasyonu taramalı elektron mikroskopisi (SEM), yüksek çözünürlüklü geçirimli elektron mikroskopisi (HRTEM), Fourier dönüşümlü kızılötesi spektroskopisi (FT-IR), X-ışınları fotoelektron spektroskopisi (XPS), mikro-Raman, X-ışınları difraktometresi (XRD) ve atomik kuvvet mikroskopisi (AFM) yöntemleri ile incelenmiştir. 20 V’de eksfoliye olan bor nanotabakalarının katmanlarının ortalama kalınlığı 15,1 nm iken, 30 ve 40 V’de eksfoliasyon sonucu olarak sırasıyla 15,3 ve 14,5 nm ortalama kalınlık değerleri elde edilmiştir. 20 V’de eksfoliye olan bor nanotabakalarının katmanlarının yanal boyutu 319 nm olup bu boyut, 30 V (252 nm) ve 40 V’de (275 nm) eksfoliye olanlardan daha büyüktür. HRTEM görüntüleri birkaç bor nanotabakasının oluştuğunu göstermektedir. Farklı voltaj değerleri karşılaştırıldığında en etkili eksfoliasyonun 20 V değerinde gerçekleştiğini ve bu değerdeki bor nanotabakalarının nispeten daha düşük kalınlığa sahip olduğunu söylemek mümkündür.

Anahtar Kelimeler

• 2 boyutlu malzemeler
• Amorf bor
• Bor nanotabakaları
• Elektrokimyasal eksfoliyasyon

Synthesis and characterization of boron nanosheets by electrochemical exfoliation of amorphous boron

Öz

Boron nanosheets are a promising material for energy, sensor and various biomedical applications. Preparation of boron nanolayers by depositing them on metal surfaces limits scalable production and reduces the potential for commercialization. Therefore, it is very important to develop a practical process to produce highly efficient and scalable boron consisting of several layers. The purpose of this study is produce boron nanosheets from amorphous boron using a unique, scalable electrochemical exfoliation method. In this method, amorphous boron was exfoliated anodically in a two-electrode setup using a mixture of sodium sulfate (Na2SO4) and glycerin. Exfoliation was performed at +20, +30, and +40 V in 0.5 M Na2SO4 to which glycerin was added (1:1 volume ratio) to increase viscosity. Structural characterization of boron nanosheets was examined by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectrometer (XPS), micro-Raman, X-Ray diffractometry (XRD) and atomic force microscopy (AFM) analyses. The average thickness of boron nanosheets exfoliated at 20 V was 15.1 nm, while exfoliation at 30 and 40 V led to average thickness values of 15.3 and 14.5 nm, respectively. The average lateral size of boron nanosheets exfoliated at 20 V is 319 nm which is larger than those that exfoliate at 30V (252 nm) and 40 V (275 nm). HRTEM images show that several nanosheets of boron are formed. When different voltage values are compared, it is possible to say that the most effective exfoliation occurs at 20 V and the boron nanosheets at this value have a relatively lower thickness.

Anahtar Kelimeler

• 2D materials
• Amorphous boron
• Boron nanosheets
• Electrochemical exfoliation

Kaynakça

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