Catalytic and electrocatalytic activities of Fe3O4/CeO2/C-dot nanocomposite

Honarasa, Fatemeh; Keshtkar, Shabnam; Eskandari, Nasrin; Eghbal, Maryam

doi:10.1007/s11696-020-01443-4

Cited by 9 publications

(5 citation statements)

References 51 publications

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“…Both particles are defined as zero-dimensional nanomaterials showing low toxicity and biocompatibility, but unlike CDs, GQDs possess a graphene structure, which confers them the unusual properties of graphene. As in the previous section, with the aim to illustrate the importance of these nanomaterials in the construction of electrochemical (bio)sensors, several selected examples reported in the literature during recent years are summarized in Table 3 [ 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ]. Although the selected examples involved electrochemical transduction, it should be noted that the number of applications using colorimetric detection where the enzymatic activity of the nanomaterial is detected by the oxidation and color change of TMB is much larger [ 54 , 55 ].…”

Section: Nanozymes Involving Graphene Quantum Dots and Carbon Dotsmentioning

confidence: 99%

Section: Nanozymes Involving Graphene Quantum Dots and Carbon Dotsmentioning

confidence: 99%

“…Table 3 shows that other nanomaterials, such as metal oxides [ 51 , 52 ] and sulfides [ 53 ], combined with carbon dots have been proposed as nanozymes for the construction of electrochemical (bio)sensors. As an example, Honarasa et al [ 52 ] prepared a triple nanozyme configuration involving Fe 3 O 4 , CeO 2 , and CDs exhibiting horseradish peroxidase-like catalytic activity with a Michaelis–Menten constant as low as 67.2 mM using H 2 O 2 as substrate. On the other hand, ultrasmall Co 9 S 8 nanocrystals stabilized on CDs have been synthesized, resulting in nanocomposites with a rich pore structure and outstanding bifunctional performances to mimic the catalytic activity of peroxidase and oxidase ( Figure 4 ).…”

Section: Nanozymes Involving Graphene Quantum Dots and Carbon Dotsmentioning

confidence: 99%

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Carbon-Based Enzyme Mimetics for Electrochemical Biosensing

Sánchez-Tirado,

Yáñez-Sedeño,

Pingarrón

2023

Micromachines

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Natural enzymes are used as special reagents for the preparation of electrochemical (bio)sensors due to their ability to catalyze processes, improving the selectivity of detection. However, some drawbacks, such as denaturation in harsh experimental conditions and their rapid de- gradation, as well as the high cost and difficulties in recycling them, restrict their practical applications. Nowadays, the use of artificial enzymes, mostly based on nanomaterials, mimicking the functions of natural products, has been growing. These so-called nanozymes present several advantages over natural enzymes, such as enhanced stability, low cost, easy production, and rapid activity. These outstanding features are responsible for their widespread use in areas such as catalysis, energy, imaging, sensing, or biomedicine. These materials can be divided into two main groups: metal and carbon-based nanozymes. The latter provides additional advantages compared to metal nanozymes, i.e., stable and tuneable activity and good biocompatibility, mimicking enzyme activities such as those of peroxidase, catalase, oxidase, superoxide dismutase, nuclease, or phosphatase. In this review article, we have focused on the use of carbon-based nanozymes for the preparation of electrochemical (bio)sensors. The main features of the most recent applications have been revised and illustrated with examples selected from the literature over the last four years (since 2020).

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Section: Nanozymes Involving Graphene Quantum Dots and Carbon Dotsmentioning

confidence: 99%

Section: Nanozymes Involving Graphene Quantum Dots and Carbon Dotsmentioning

confidence: 99%

Section: Nanozymes Involving Graphene Quantum Dots and Carbon Dotsmentioning

confidence: 99%

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Carbon-Based Enzyme Mimetics for Electrochemical Biosensing

Sánchez-Tirado,

Yáñez-Sedeño,

Pingarrón

2023

Micromachines

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“…Qin et al used hydroxyl-rich carbon dot-assisted gold nanoparticles (CDs @AuNP) as a marker of copper deposition reaction, and cooperated with chitosan to modify glassy carbon electrode (Qin et al, 2018). Hu et al used coordination reaction and surface adsorption to prepare ferrous and ferrous ion modified CDs to regulate heterogeneous nucleation process of iron oxide, and its enzyme-like activity was more than 6 times higher than that of pure Fe 2 O 3 nanomaterials (Hu et al, 2021) Fatemeh Honarasa et al prepared Fe 3 O 4 /CeO 2 /C-dot nanozyme with more complex structure, and its modified multi-walled carbon nanotube/ionic liquid paste (MWIL) electrode was used for electrocatalytic determination of H 2 O 2 , showing a linear range of 2.0 × 10 −8 ∼ 1.0 × 10 −6 M (Honarasa et al, 2021).…”

Section: The Electrochemical Sensorsmentioning

confidence: 99%

Progress in the Application of Carbon Dots-Based Nanozymes

Zhang

Luan

et al. 2021

Front. Chem.

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As functional nanomaterials with simulating enzyme-like properties, nanozymes can not only overcome the inherent limitations of natural enzymes in terms of stability and preparation cost but also possess design, versatility, maneuverability, and applicability of nanomaterials. Therefore, they can be combined with other materials to form composite nanomaterials with superior performance, which has garnered considerable attention. Carbon dots (CDs) are an ideal choice for these composite materials due to their unique physical and chemical properties, such as excellent water dispersion, stable chemical inertness, high photobleaching resistance, and superior surface engineering. With the continuous emergence of various CDs-based nanozymes, it is vital to thoroughly understand their working principle, performance evaluation, and application scope. This review comprehensively discusses the recent advantages and disadvantages of CDs-based nanozymes in biomedicine, catalysis, sensing, detection aspects. It is expected to provide valuable insights into developing novel CDs-based nanozymes.

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“…Therefore, developing artificial peroxidase mimics are increasingly of considerable interest. [ 2 ] These artificial mimics, including CeO 2 , [ 3 ] Fe 3 O 4 , [ 4 ] Co 3 O 4 , [ 5–8 ] MnO 2 [ 9,10 ] and MoS 2 nanaosheets, [ 11 ] show desirable peroxidase‐like activities similar to that of natural horseradish peroxidase (HRP). The high catalytic activity of these artificial mimics can result in favourable applications in biosensing, [ 12 ] early cancer diagnosis, [ 13 ] and removal of pollutants.…”

Section: Introductionmentioning

confidence: 99%

The valine‐based N‐doped carbon dots with high peroxidase‐like activity

2022

Luminescence

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Developing artificial nanoparticles with peroxidase-like activity have attracted great interests because their catalytic activity is not easy to lose under harsh conditions compared with natural enzymes. In this work, the N-doped carbon dots (CDs) were prepared; it was found that the N-doped CDs showed high peroxidase-like catalytic activity towards the reaction system of hydrogen peroxide:3,3 0 ,5,5 0 -tetramethylbenzidine (TMB). The catalytic mechanism of the N-doped CDs was explored using electron spin resonance spectra, cyclic voltammetry methods and simulation of density functional theory calculations. This work can offer a new feasible method for synthesizing Ndoped carbon quantum dots used as artificial peroxidases in biological and environment applications.

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Catalytic and electrocatalytic activities of Fe3O4/CeO2/C-dot nanocomposite

Cited by 9 publications

References 51 publications

Carbon-Based Enzyme Mimetics for Electrochemical Biosensing

Carbon-Based Enzyme Mimetics for Electrochemical Biosensing

Progress in the Application of Carbon Dots-Based Nanozymes

The valine‐based N‐doped carbon dots with high peroxidase‐like activity

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