Metal oxide-carbon nanotubes nanocomposite-modified electrochemical sensors for toxic chemicals

Sonkar, Piyush Kumar; Ganesan, V.

doi:10.1016/b978-0-12-820727-7.00006-9

Cited by 3 publications

(2 citation statements)

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“…This confirms the initial one electron removal step predicted for the initial stage in the electrochemical oxidation of most aromatic hydrocarbons proposed in previous studies [81,82]. Also, the electron transfer rate constant ( k s ), estimated from equation (19) [69,83], was determined to be The electrode's performance in comparison to previously published modified electrodes for pyrene detection are presented in table 4. Our findings proposes that GCE/fMWCNTs/CuO NPs is a suitable electrode for micromolar electrochemical detection of pyrene.…”

Section: The Electrocatalytic Response Of the Electrodes To Pyrene Ox...supporting

confidence: 84%

“…Semiconducting metal oxide (MO) nanoparticles are also widely explored by researchers due to their significant properties such as large active surface area, high porosity, and electrical conductivity. The synergy between metal oxide nanoparticles and multi-walled carbon nanotube enhances electrochemical activities significantly [19]; as a result, the integration of copper oxide nanoparticle (a good sensing p-type semiconductor with narrow band gap and excellent electrocatalytic activity extensively used in heterogeneous catalysts for hydrocarbons oxidation) [20] with MWCNTs can boost sensor performance by enhancing the charge transfer between the analytes and the support matrices [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Electro-oxidation of pyrene on glassy carbon electrode modified with fMWCNTs/CuO nanocomposite

Adesanya,

Fayemi

2024

Mater. Res. Express

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The electrochemical oxidation of pyrene, a well-known polycyclic aromatic hydrocarbon, was investigated using a glassy carbon electrode (GCE) modified with nanocomposite of copper oxide nanoparticles incorporated functionalized multi-walled carbon nanotubes (fMWCNTs). The catalytic copper oxide nanoparticles (CuONPs) synthesized through a chemical co-precipitation method was combined with the highly electrically conductive functionalized multi-walled carbon nanotubes using a simple and efficient method. Several analytical techniques were employed in characterizing the nanomaterials namely: scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and the ultraviolet–visible (UV-vis) spectroscopy, to validate the authenticity of the synthesis. The electrochemical behaviour of the proposed electrode was investigated in 10 mM [Fe(CN)6]3-/4- via electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), revealing the highest current response and lowest charge transfer resistance at the hybrid nanocomposite modified electrode (GCE/fMWCNTs/CuO NPs) in comparison with the other electrodes studied in this work (GCE, GCE/CuO NPs, and GCE/fMWCNTs. The electrocatalytic efficacy of the electrodes towards pyrene oxidation was also evaluated, with a similarly outstanding increment in the oxidation peak current response and highly reduced resistance to charge transfer at the nanocomposite-modified glassy carbon electrode. This enhanced electrocatalytic activity facilitated the transport of electrons between the pyrene molecules and the nanocomposite-modified electrode which is attributable to the synergy between the functionalized multi-walled carbon nanotubes and the copper oxide nanoparticles. The low detection limit of 1.30 µM within the linear range (1.2 - 23.1 µM) demonstrated by the sensor indicates its high sensitivity and potential for environmental-based analytical applications such as pyrene detection.

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Section: The Electrocatalytic Response Of the Electrodes To Pyrene Ox...supporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Electro-oxidation of pyrene on glassy carbon electrode modified with fMWCNTs/CuO nanocomposite

Adesanya,

Fayemi

2024

Mater. Res. Express

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High-Precision Nonenzymatic Electrochemical Glucose Sensing Based on CNTs/CuO Nanocomposite

Geetha

Maurya

Al‐Maadeed

et al. 2022

J. Electron. Mater.

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The measurement of blood glucose levels is essential for diagnosing and managing diabetes. Enzymatic and nonenzymatic approaches using electrochemical biosensors are used to measure serum or plasma glucose accurately. Current research aims to develop and improve noninvasive methods of detecting glucose in sweat that are accurate, sensitive, and stable. The carbon nanotube (CNT)-copper oxide (CuO) nanocomposite (NC) improved direct electron transport to the electrode surface in this study. The complex precipitation method was used to make this NC. X-ray diffraction (XRD) and scanning electron microscopy were used to investigate the crystal structure and morphology of the prepared catalyst. Using cyclic voltammetry and amperometry, the electrocatalytic activity of the as-prepared catalyst was evaluated. The electrocatalytic activity in artificial sweat solution was examined at various scan rates and at various glucose concentrations. The detection limit of the CNT-CuO NC catalyst was 3.90 µM, with a sensitivity of 15.3 mA cm−2 µM−1 in a linear range of 5–100 µM. Furthermore, this NC demonstrated a high degree of selectivity for various bio-compounds found in sweat, with no interfering cross-reactions from these species. The CNT-CuO NC, as produced, has good sensitivity, rapid reaction time (2 s), and stability, indicating its potential for glucose sensing. Graphical Abstract

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A Dft Screening of Ch4 Detection by (8,0) Single-Walled Carbon Nanotubes Decorated with Small Tin-Oxide Clusters

Adloo,

Nasresfahani,

Safaiee

2024

Preprint

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Metal oxide-carbon nanotubes nanocomposite-modified electrochemical sensors for toxic chemicals

Cited by 3 publications

References 95 publications

Electro-oxidation of pyrene on glassy carbon electrode modified with fMWCNTs/CuO nanocomposite

Electro-oxidation of pyrene on glassy carbon electrode modified with fMWCNTs/CuO nanocomposite

High-Precision Nonenzymatic Electrochemical Glucose Sensing Based on CNTs/CuO Nanocomposite

A Dft Screening of Ch4 Detection by (8,0) Single-Walled Carbon Nanotubes Decorated with Small Tin-Oxide Clusters

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