Transmission electron microscopy for evaluating the structural parameters of nanoparticles

Zakharov, N. S.; Попова, А. Н.; Zakharov, Yu. A.; Пугачев, В. М.; Russakov, D. М.

doi:10.1088/1742-6596/1749/1/012011

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…33 The corresponding atomic-scale image (Figure 3c inset) of the Ni−NiO nanocomposite exhibits the well-organized lattice planes of the composite. 38 In accordance with the lattice fringes, ring diffraction was also observed through SAED (selected area electron diffraction) pattering (Figure 3d). The average d-spacing was found to be 0.31 Å.…”

Section: ■ Experimental Sectionsupporting

confidence: 72%

“…The reason for the contrast in mass and thickness is that regions with higher atomic numbers (Ni–O) or greater thickness scatter electrons more intensely, making them appear dark in bright-field images over lower atomic number (Ni) particles (Figure c) . The corresponding atomic-scale image (Figure c inset) of the Ni–NiO nanocomposite exhibits the well-organized lattice planes of the composite . In accordance with the lattice fringes, ring diffraction was also observed through SAED (selected area electron diffraction) pattering (Figure d).…”

Section: Resultsmentioning

confidence: 67%

“…As indicated in Figure b, the slope ( b ) value is 0.83, which indicates the peak current response is coming mainly due to a surface-defined reaction …”

Section: Resultsmentioning

confidence: 86%

“…As indicated in Figure 5b, the slope (b) value is 0.83, which indicates the peak current response is coming mainly due to a surface-defined reaction. 38 However, as indicated in eq (iv), the anodic and cathodic peak potential increases linearly with increasing scan rate, resembling "a" shaped CV curve (Figure 5a). 39 Such a phenomenon is associated with the quasireversible nature of the redox reaction:…”

Section: ■ Experimental Sectionmentioning

confidence: 82%

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A Redox Mediator-Free Highly Selective and Sensitive Electrochemical Aptasensor for Patulin Mycotoxin Detection in Apple Juice Using Ni–NiO Pseudocapacitive Nanomaterials

Datta,

Bhatt,

Dutta

2024

J. Agric. Food Chem.

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Pseudocapacitive nanomaterials have recently gained significant attention in electrochemical biosensors due to their rapid response, long cycle life, high surface area, biomolecule compatibility, and superior energy storage capabilities. In our study, we introduce the potential of using Ni−NiO nanofilm's pseudocapacitive traits as transducer signals in electrochemical aptasensors. Capitalizing on the innate affinity between histidine and nickel, we immobilized histidine-tagged streptavidin (HTS) onto Ni−NiOmodified electrodes. Additionally, we employed a biolayer interferometry-based SELEX to generate biotinylated patulin aptamers. These aptamers, when placed on Ni−NiO−HTS surfaces, make a suitable biosensing platform for rapid patulin mycotoxin detection in apple juice using electrochemical amperometry in microseconds. The novelty lies in optimizing pseudocapacitive nanomaterials structurally and electrochemically, offering the potential for redox mediator-free electrochemical aptasensors. Proof-of-concept is conducted by applying this surface for the ultrasensitive detection of a model analyte, patulin mycotoxin. The aptamer-functionalized bioelectrode showed an excellent linear response (10−10 6 fg/mL) and an impressive detection limit (1.65 fg/mL, +3σ of blank signal). Furthermore, reproducibility tests yielded a low relative standard deviation of 0.51%, indicating the good performance of the developed biosensor. Real sample analysis in freshly prepared apple juice revealed no significant difference (P < 0.05) in current intensity between spiked and real samples. The sensor interface maintained excellent stability for up to 2 weeks (signal retention 96.45%). The excellent selectivity, stability, and sensitivity of the electrochemical aptasensor exemplify the potential for using nickelbased pseudocapacitive nanomaterials for a wide variety of electrochemical sensing applications.

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Section: ■ Experimental Sectionsupporting

confidence: 72%

Section: Resultsmentioning

confidence: 67%

“…As indicated in Figure b, the slope ( b ) value is 0.83, which indicates the peak current response is coming mainly due to a surface-defined reaction …”

Section: Resultsmentioning

confidence: 86%

Section: ■ Experimental Sectionmentioning

confidence: 82%

See 2 more Smart Citations

A Redox Mediator-Free Highly Selective and Sensitive Electrochemical Aptasensor for Patulin Mycotoxin Detection in Apple Juice Using Ni–NiO Pseudocapacitive Nanomaterials

Datta,

Bhatt,

Dutta

2024

J. Agric. Food Chem.

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Green synthesis of copper nanoparticles using aqueous extracts from Hyptis suaveolens (L.)

R¹,

Reddy²,

Gangula³

et al. 2022

Materials Chemistry and Physics

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Synthesis and study of some physicochemical features of Co-Pt nanostructured system

Zakharov,

Tikhonova,

Popova

et al. 2024

BIO Web Conf.

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In the work by methods of XRD, TEM, SAED, XPS combined with mass-spectrometry of gaseous products, SAXS, and elemental analysis of samples the phase compositions and morphology of particles of nanostructured Co-Pt system synthesized by the method of reduction of hydrazine-hydrate aqueous solutions of precursors were studied (in the region rich in Pt for the first time). It was found that in the composition range up to ≈ 60 at. % Co. XRD-analysis of synthesized samples fixes as the only FCC phase of solid solution of Co in Pt, with the established upper limit of solubility %18±1 at. At the content of Co above the limit, along with it, the X-ray diffraction unregistered phases with the content of Co above the limit in solid solution are also formed. Their presence was confirmed by the SAXS method, and their metallic nature (not oxide-hydroxide) nature follows from the results of XRD, SAED. When FCC phase formed metal reduction process proceeded directly without cobalt hydroxides forming. According to results of XPS with the Ar-etching of samples there were internal platinum-rich sub-regions in Co-Pt nanoalloys.

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Transmission electron microscopy for evaluating the structural parameters of nanoparticles

Cited by 6 publications

References 13 publications

A Redox Mediator-Free Highly Selective and Sensitive Electrochemical Aptasensor for Patulin Mycotoxin Detection in Apple Juice Using Ni–NiO Pseudocapacitive Nanomaterials

A Redox Mediator-Free Highly Selective and Sensitive Electrochemical Aptasensor for Patulin Mycotoxin Detection in Apple Juice Using Ni–NiO Pseudocapacitive Nanomaterials

Green synthesis of copper nanoparticles using aqueous extracts from Hyptis suaveolens (L.)

Synthesis and study of some physicochemical features of Co-Pt nanostructured system

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