PdAg-decorated three-dimensional reduced graphene oxide-multi-walled carbon nanotube hierarchical nanostructures for hig
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2D Nanomaterials for Healthcare and Lab-on-a-Chip Devices Research Letter
PdAg-decorated three-dimensional reduced graphene oxide–multi-walled carbon nanotube hierarchical nanostructures for high-performance hydrogen peroxide sensing Aytekin Uzunoglu, Metallurgical and Materials Engineering, Faculty of Engineering and Architecture, Necmettin Erbakan University, Konya, Turkey; Alaca Avni Celik Vocational School, Hitit University, Corum, Turkey Dursun Ali Kose, Department of Chemistry, Faculty of Science and Literature, Hitit University, Corum, Turkey Kazim Kose, Alaca Avni Celik Vocational School, Hitit University, Corum, Turkey Ebru Gokmese and Faruk Gokmese, Department of Chemistry, Faculty of Science and Literature, Hitit University, Corum, Turkey Address all correspondence to Aytekin Uzunoglu at [email protected], [email protected] (Received 25 January 2018; accepted 16 April 2018)
Abstract High-performance electrochemical hydrogen peroxide (H2O2) sensors based on PdAg nanoparticle-decorated reduced graphene oxide (rGO) and multi-walled carbon nanotube (MWCNT) hybrids were developed. The nanostructures were characterized using transmission electron microscopy, scanning electron microscopy, energy-dispersive spectroscopy, thermogravimetric analysis, Fourier transform spectroscopy, and x-ray diffraction techniques. It was found that introduction of MWCNT in the catalyst layer improved the sensitivity and widened the linear range. Sensitivities of 393.2, 437.1, and 576.6 µA/mM/cm2 were obtained for PdAg/rGO–MWCNT (2:1), PdAg/rGO–MWCNT (1:1), and PdAg/ rGO–MWCNT (1:2), respectively. Furthermore, hierarchical structure of rGO–MWCNT nanohybrids enabled the detection of H2O2 up to 80 mM.
Introduction Detection of hydrogen peroxide (H2O2) plays a key role in various applications ranging from food and environmental analysis to biochemistry.[1–3] Furthermore, since H2O2 is generated from the respiratory chain cascade and cellular metabolism, its level in blood can be used to diagnose asthma, inflammatory arthritis, diabetic vasculopathy, and a number of neurodegenerative diseases.[4–6] For this reason, researchers have focused on the development of novel methods to determine the level of this important analyte in fast, cost-effective, and accurate manners. While there are various analytical methods such as colorimetry,[7] titrimetry,[8] chromatography,[9] photometry,[10] and electrochemical analysis[11] exploited to determine the level of H2O2 in different media; simpler, cost-effective, and faster methods with higher sensitivity and selectivity must be developed to meet high-technology requirements.[2] Among the mentioned techniques, electrochemical methods offer many advantages including fast response, low cost, simplicity, high sensitivity and selectivity, rendering electrochemical detection of H2O2 one of the most promising ones for commercialization.[11] Among all carbon species, carbon nanotube (CNT) and graphene are the most studied allotropes due to their unique structural, electronic, physical, mechanic
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