Serbest Duran ve Esnek MnO2/Grafen Kağıt Elektrot: Dopamin Tayini İçin Yeni Tip Amperometrik Sensör

Bu çalışmada, serbest duran, yüksek esneklik ve dayanıklılık özelliğine sahip, yüzeyi MnO2 kaplı indirgenmiş grafen oksit (MnO2/rGO) kağıt hazırlanmıştır. Elde edilen MnO2/rGO kağıt, taramalı elektron mikroskobu-enerji dağılımlı X-ışını spektroskopisi (SEM-EDS), X-ışını kırınım spektroskopisi (XRD), X-ışını foto elektron spektroskopisi (XPS) ve Raman spektroskopisi gibi teknikler ile karakterize edilmiştir. Dopaminin (DA) elektrokimyasal davranışı, esnek MnO2/rGO kağıt üzerinde, dönüşümlü voltametri ve amperometri metotları ile incelenmiştir. Elektrokimyasal sonuçlar, esnek MnO2/rGO kağıt elektrotun yüksek spesifik yüzey alanına sahip olmasından dolayı, DA'ya karşı mükemmel elektrokatalitik aktivite sergilediğini göstermiştir. Ayrıca, elde edilen esnek elektrokimyasal sensör, DA'nın amperometrik tayininde; geniş bir doğrusal aralık, düşük tayin sınırı ve oldukça hassas tepki göstermiştir.

Anahtar Kelimeler:

Amperometrik sensör, Dopamin, Grafen kağıt, MnO2

Free-standing and Flexible MnO2/Graphene Paper Electrode: A Novel Amperometric Sensor for Dopamine Detection

In this study, free-standing MnO2 coated reduced graphene oxide (MnO2/rGO) paper with high flexibility and durability was prepared. As-prepared MnO2/rGO paper was characterized by scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The electrochemical behavior of dopamine (DA) was investigated on flexible MnO2/rGO paper with cyclic voltammetry and amperometry methods. Electrochemical results have shown that the flexible MnO2/rGO paper electrode exhibits excellent electrocatalytic activity to DA due to its high specific surface area. In addition, the obtained flexible electrochemical sensor showed a wide linear range, a low detection limit and a very sensitive response for the amperometric determination of DA.

Keywords:

Amperometric sensor, Dopamine, Graphene paper, MnO2,

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