Pd nanoparticle-modified electrodes for nonenzymatic hydrogen peroxide detection

Wang, Jue; Chen, Xue-Jiao; Liao, Kaiming; Wang, Guanghou; Han, Min−Koo

doi:10.1515/nano.11671_2015.21

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…Face-centered cubic (FCC) nanoparticles are widely used in applications such as drug delivery [1,2], catalysis [3], tribology [4], nanolithography [5], electrochemical sensors [6], and as fillers in polymer composites [7]. Many of these applications apply mechanical loads resulting in compression of the particles, by design or inadvertently during use.…”

Section: Introductionmentioning

confidence: 99%

Atomistic Simulations of the Elastic Compression of Platinum Nanoparticles

2022

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The elastic behavior of nanoparticles depends strongly on particle shape, size, and crystallographic orientation. Many prior investigations have characterized the elastic modulus of nanoscale particles using experiments or simulations; however their reported values vary widely depending on the methods for measurement and calculation. To understand these discrepancies, we used classical molecular dynamics simulation to model the compression of platinum nanoparticles with two different polyhedral shapes and a range of sizes from 4 to 20 nm, loaded in two different crystal orientations. Multiple standard methods were used to calculate the elastic modulus from stress-vs-strain data for each nanoparticle. The magnitudes and particle-size dependence of the resulting moduli varied with calculation method and, even for larger nanoparticles where bulk-like behavior may be expected, the effective elastic modulus depended strongly on shape and orientation. Analysis of per-atom stress distributions indicated that the shape- and orientation-dependence arise due to stress triaxiality and inhomogeneity across the particle. When the effective elastic modulus was recalculated using a representative volume element in the center of a large nanoparticle, the elastic modulus had the expected value for each orientation and was shape independent. It is only for single-digit nanoparticles that meaningful differences emerged, where even the very center of the particle had a lower modulus due to the effect of the surface. These findings provide better understanding of the elastic properties of nanoparticles and disentangle geometric contributions (such as stress triaxiality and spatial inhomogeneity) from true changes in elastic properties of the nanoscale material.

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Section: Introductionmentioning

confidence: 99%

Atomistic Simulations of the Elastic Compression of Platinum Nanoparticles

2022

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“…Unfortunately, their low stability attributed to their denaturation under the applied conditions limits their practical application. As a result, noble metal-based sensors (e.g., AuNPs, 17 AgMPs, 18 PtNPs, 19,20 and PdNPs 21 ) have been introduced as alternative, nonenzymatic H 2 O 2 sensors. Among them, silver nanostructures have attracted significant attention owing to their good activity and stability for H 2 O 2 electroreduction.…”

Section: ■ Introductionmentioning

confidence: 99%

Silver–Iron Hierarchical Microflowers for Highly Efficient H₂O₂ Nonenzymatic Amperometric Detection

Sarhan

El‐Nagar

Abouserie

et al. 2019

ACS Sustainable Chem. Eng.

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This study addresses the fabrication of monodispersed iron-doped silver meso-hierarchical flower-like structures via a facile chemical procedure. The morphology of the obtained silver particles has been tuned by changing the concentration of the structure-directing agent (malonic acid). Ball-shaped silver particles were formed in the absence of malonic acid (MA), while silver particles with craspedia-globosa, chrysanthemum, and dahlia flower-like structures were obtained in the presence of 0.2, 0.5, and 1 mM malonic acid, respectively. The doping of these dahlia flower-like structures with trace amounts of iron (≤5% Fe weight percent) led to the formation of globe-amaranth iron-doped microflowers (AgFe amaranth ). The as-prepared AgFe amaranth exhibited better performance as a nonenzymatic H 2 O 2 sensor compared to undoped silver particles as demonstrated by their higher catalytic activity and stability together with superior sensitivity (1350 μM −1 cm −2 , 61 times higher) and lower detection limit (0.1 μM). These enhancements are attributed to the AgFe unique flower-like structures and to the fact that the iron dopants provide a higher number of electroactive sites and reduce the charge transfer resistance of H 2 O 2 reduction. Additionally, the good stability of AgFe is believed to originate from the faster detachment rate of the in situ-formed gas bubbles from their surfaces compared to undoped silver structures.

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“…Recently, hydrogen peroxide (H 2 O 2 ) is a major intermediate of biological cycles which has been used as a potential biomarker for oxidative stress diagnosis as well as a major catalyst for immune sensing [ 1 , 2 ]. On the other hand, it is also an essential compound of bleach industries and waste water treatment.…”

Section: Introductionmentioning

confidence: 99%

Detection of pH and Enzyme-Free H2O2 Sensing Mechanism by Using GdO x Membrane in Electrolyte-Insulator-Semiconductor Structure

et al. 2016

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A 15-nm-thick GdOx membrane in an electrolyte-insulator-semiconductor (EIS) structure shows a higher pH sensitivity of 54.2 mV/pH and enzyme-free hydrogen peroxide (H2O2) detection than those of the bare SiO2 and 3-nm-thick GdOx membranes for the first time. Polycrystalline grain and higher Gd content of the thicker GdOx films are confirmed by transmission electron microscopy (TEM) and X-ray photo-electron spectroscopy (XPS), respectively. In a thicker GdOx membrane, polycrystalline grain has lower energy gap and Gd2+ oxidation states lead to change Gd3+ states in the presence of H2O2, which are confirmed by electron energy loss spectroscopy (EELS). The oxidation/reduction (redox) properties of thicker GdOx membrane with higher Gd content are responsible for detecting H2O2 whereas both bare SiO2 and thinner GdOx membranes do not show sensing. A low detection limit of 1 μM is obtained due to strong catalytic activity of Gd. The reference voltage shift increases with increase of the H2O2 concentration from 1 to 200 μM owing to more generation of Gd3+ ions, and the H2O2 sensing mechanism has been explained as well.

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Pd nanoparticle-modified electrodes for nonenzymatic hydrogen peroxide detection

Cited by 4 publications

References 26 publications

Atomistic Simulations of the Elastic Compression of Platinum Nanoparticles

Atomistic Simulations of the Elastic Compression of Platinum Nanoparticles

Silver–Iron Hierarchical Microflowers for Highly Efficient H₂O₂ Nonenzymatic Amperometric Detection

Detection of pH and Enzyme-Free H2O2 Sensing Mechanism by Using GdO x Membrane in Electrolyte-Insulator-Semiconductor Structure

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Pd nanoparticle-modified electrodes for nonenzymatic hydrogen peroxide detection

Cited by 4 publications

References 26 publications

Atomistic Simulations of the Elastic Compression of Platinum Nanoparticles

Atomistic Simulations of the Elastic Compression of Platinum Nanoparticles

Silver–Iron Hierarchical Microflowers for Highly Efficient H2O2 Nonenzymatic Amperometric Detection

Detection of pH and Enzyme-Free H2O2 Sensing Mechanism by Using GdO x Membrane in Electrolyte-Insulator-Semiconductor Structure

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Silver–Iron Hierarchical Microflowers for Highly Efficient H₂O₂ Nonenzymatic Amperometric Detection